Thank you so much for taking us all on the entire journey. So many videos stop at just replacing the power supply. It is so cool to see individual components replaced and your diagnosis to get there. Thank you for taking the time to make this video.
Great video, my TV actually blew an internal fuse on the power board so that'll need a new one soldered on, this video has helped me understand a lot more to look out for thanks
That white silicone stuff is actually thermal silicone paste. It’s designed to transfer heat away from the mosfets. I like your video man. Thanks for sharing. I thought I heard you inquire about what that stuff was there for...
Quick tip for people when you have repaired a power supply either adapt a mains lead or pull one leg of the fuse out and in place put a 100w filament bulb in across where the fuse goes or in series with the mains cable.... if the bulb glows like full on there is a short if it’s dim and like pulses it’s all good to go...... saves blowing up parts you have just changed And BD at the start it looked a bit sooty on the white silicon as if something has gone bang keep up the good work 😁
@@elchorisonn That's optimism at its finest. I promise you that most people are not smart enough or have the aptitude to conduct micro electronic repair, troubleshooting or component replacement. Along with technical ability and background, the willingness to attempt repairs such as those is required.
Hey Bigdog!!! I really wish I could talk to you about a tv I just bought! I subscribed and have learned quite a lot just watching your troubleshooting and repairing these various tvs! Awesome job!!! The tv is a Samsung UN65J6200AFXZA that had sound, but no picture, had backlights but a few of them were out and all 6 rows light up. Replaced them with new set, changed the T-Con board now NOTHING works! I only get 8.82 DC Volts going to the main board... I have replaced the T-con twice, the power board once and everything has progressively gone from hopeful to zero and it bugs me! I really want to get this tv fixed. Help! LOL... Any suggestions Bigdog? I appreciate anything... I'm befuddled..LOL Thanks man...
After seeing the close ups of the MOSFETs it looks like the white stuff is RTV silicone used for insulation between the legs also works for corrosion prevention in exposed environments.
Solastic compound is used to keep stuff in place it seems so if you have to solder on the bottom of the board you can throw solastic on the component solder flip it it over and solder it in most likely. Similar to what they do with flux you can use solastic for holding the component in place. It really has no net negative effect its not electrically conductive. However there is no reason why they wouldn't do things like this to make it a pain to fix however its more likely it makes it easier for them to solder. ;) If they do it in steps it makes sense. This station sets everything next station solders etc... Its not needed though you are right about this.
The white silicone is for vibration control and the heat /cool process so that it reduces bad solder joints as far as i know.Also large components use it as the mass is larger and helps hold it.
Greetings my Brother a job well done,,for those who my not have had Theoretical experience in Electronics some of your explanation may sound like Gibrish to the unlearned ,,Praise God at age 28 i did this course with NTS of Los Angles California,,stiill with an elapse of 8 years away from Electronic Repairs being in Curacao in construction ,,my profile photo is while i was in living in Curacao for 8 years remigrated back to Suriname in 2016 ,, Still !!! Theory is very important,, luckily at age 64+ my memory bank still functions thus at the said time i started in the 1980,s with Tube/Lamp RCA ,12 volt Samsung etc etc etc TV,s ,,all in all Theory is a stepping stone ,truthfully is that i have learnt a great deal from you,,keep up the good work ,One Love from Suriname the Caribbean,South America, My Brother God Bless
Thanks man for your story have been learning electronics from the internet for the last few years while practicing phone and laptop repairs, am now in preparations to set up a reputable electronics repair company here in East Africa
Great video , thanks. On this exact board I am not getting the 13volts at the output connector. The fuse is not blown and the tv does not turn on nor is there a standby light that is lit. I checked the diodes and they all seem fine .What other component or components would you suspect? Where would you start?
Hi buddy, i have a sony home theater smps here. Theres primary voltages present but absolutely no voltages on secondary. Am i missing something here? Caps are good, optos are good, smd parts are good. All tested. Still voltage missing. The model is Sony Hcd-Fxg9k
Great video.....I have a Samsung 75" Q70R and it went black screen while watching a movie, it flashed blue every 20 seconds, I have some knowledge in electronics so I opened it to see if it had bad capacitors. With the TV energized, I disconnected the ribon cable that goes to the main board and the screen turned blue, so I assumed it was not the damaged screen, I have been looking on ebay and I have found the original power supply parts, do you think that replacing the board will solve the problem?...thanks
Did you find out what the issue is? Because I'm having the same problem. Turn the TV on at the plug socket and my screen comes on for a few seconds then turns off, and then repeats the same process over and over.
in that case the silicone is for electrical isolation, note the isolation slots in the pcb between the holes I assume there is some kind of fire hazard if dust builds up in there its not for vibration as those arent free standing components, they are screwed into the heatsink its not for thermal transfer, again they are screwed into the heatsink for that purpose
I have a TV I just replaced the backlight led strips. Power supply fuse is good too. But still they don't light up. What could be the cause? Are there other points on the power supply that I should check? Same model TV
Bro nice channel❤ it !!! However i think that white silicone glue stuff is for explosion/projectile protection fir us technicians so the components will not become a bullet if it blows out 👍 think about it only the HIGH POWER COMPONENTS HAS THAT GLUE ....
Great video, even though it's a bit too advanced for me. I have a question here: I have a 7 year old 46 inch Samsung TV (UN46F6350AFXZA) that was hit by lightening. The TV is completely dead, and so is the Blu Ray player that is connected to it. The other electronics connected to the same power strip/surge protector are fine. Should I even attempt to try replacing the boards to try to fix it? Or could both the power board and main board be fried and it wouldn't be worth it. Just hate to see the thing goes to waste. Any suggestions would be much appreciated.
I have the same tv but when I turn it on in the dark and flash a light to the screen I can see the words when I turn off the flashlight I can’t see anything..I’m guess it’s the led lights what you think? Do I have to get a new board?
your welcome... got to leave this kind of stuff to guys like you.. yesterday I tried to see if I could figure out why my Samsung smart tv wasn't working. everything was going so well. had it all apart, no broken or lost pieces had the circuit board out and was seeing if I could figure out the problem... anyways I must have touched something I wasn't meant to touch cuz it zapped the crap out of me! that is one strong jolt! aside from being taxed by the cops I've never felt a stronger jolt
Is there a way for contacting you straight? Email or something? I have a Samsung tv that has power only every other day. Sometimes it works for a day or two but after I turn it off it has no power (no standby light) only way to get it working again is unplug from outlet and wait few days. Tv itself has no buttons for reset. What can cause it?
Hi, it is more for prevent of subsonic vibrations, which can be heared sometimes from low quality power supply and can cause damage to the soldering, too. Sometimes you see some kind of wax for this purpouse, sometimes silicone and sometimes parts are completly covered with epoxy.
Hi Big Dog, I have the exact same TV power supply board and TV model. I get a blinking red light and tested all the fuses and mosfet and it all looks good. TV will not turn on. Am I missing something?
A question at the 5 pin connector where you said the stand by power is. I have two of the 5 pins marked as ground (GND) on the 2nd ground pin I have 12 volts, measuring from the board ground screws to the ground pin! This would indicate to me that the power board has a short? What do you think
Hi BigDog, thank you for posting your helpful and professional videos! I've been repairing a Samsung UN60J620DAF, and could use your expertise. It started out flashing the picture on and off, I would gently tap the back of the TV and picture would resume, but after a while of this, the picture flashed off and didn't come back. Still had sound, so I ordered a new TCON board and installed it. With that, I got the picture back full time, and the sound was still good, but now there is a pulsing of the picture. It pulses lighter and darker at half second intervals, so rapidly. This happens in all input modes, after adjusting all eco / power / video settings and resetting / restarting everything. After further inspection, I heard a buzzing sound coming from the power board, so I ordered a new one, installed it, but still have the pulsing picture problem. I have also replaced the LVDS ribbon cable with a new one. What do you think could be the problem / what would you suggest I try next? Thank you!
UPDATE: I opened the TV up to the LEDs but cannot identify any that are burned or that don't work. Any suggestions on how to move forward? I don't have an LED tester, I just turned the TV on while the LEDs were exposed and saw them all light up very brightly.
Hi, i have a Samsung UN60J620DAFXZA EA03 and the power light is blinking/flashing with no picture or sound, tried the reset, plug in-plug off but nothing worked…i don’t want to throw away and trying to fix it myself…i don’t have all the tools but i can just replace the entire board…What do you suggest and where can i buy the replacement?
I have a group of 4 diodes that appear to have a burn mark on board below them near my LED plug. I have no back lights at all, but standby light comes on, but flashes a few times and stays solid. Any idea if its bad LED's or bad PS? It shows im getting about 414 DC volts in each of D+1, D+2, D-8, D-9. Is that good or bad?
If U appy voltage to the PS on (should be less than 5v 1A) its only going to turn on the 12v and 5v supply. There should also be a BL on (Backlight On) pin too. U can try to do it that way just starting at about 3v and go to no higher than 5v. I never tried to turn on the BL circuit with the board out of the TV, so don't really know if thats going to work, but it should. Good Question though! Thanks for watching too.
@@bigdog8882 I found the answer by mistake, the power supply seems to be on, when the mainboard is disconnected(at least mine are) The backlight power as well, The standby in your video is 12.7 v meaning it's on, vs the 8v when off, I have 300+v on the backlight terminals as well. When I plug in the backlights the power supply quits, it seems my LEDs are shorted as well. resistors are good. Thanks for the reply! Keep making great videos!
@@speter60 Note, If you unplug the connector from the Main to PS board and the backlights come on, then your Backlights are good. Probably have a mainboard issue. I forget that this TV use's a low instead of a high to turn on the BL's and PS board.
Some times 2 or more mosfet in a board apear as shorted but as you mentioned the problem is just one of them But not needed to removing randomly. Between them, the one is has short between mor than two pin's is the problem Before you check both i knew the left one on back of board is the problem bro.
Hello. I have a similar board for samsung UN60J6200AF. I measured all the MOSTFETS, and AC fuse. All have no short. They are fine. My symptom is no power and no standby voltage (1.5V instead of 8V). What else could I look into?
Bigdog/anybody, i have the bn44-00775a board for the 60in. No backlights, replaced them still no backlights. Old ones just flashed off and on nonstop with several burned out. New ones check out fine but no backlight when i get them into the tv. I have picture and sound. Measure 12.3Vdc to main board but 380-400vdc to the led d+. Legend says it should be 326v. Any ideas what to try next?
I have the same model and my backlights aren’t getting any power. I can hook another power board up to it and the backlights power up. I hooked up 2 power boards up to it at the same time and it came on. I’m getting no power to the backlights on the original board. Help
Help, I'm at a stand still. I just buy some of those mofects? Those aren't the problem, check the fuse not blown. My components Ed are bit rusty. I got 2 TVs one is from 2015 and the other is from 2016 not sure if that matters. But its the same model of tv. So now my understanding is they both had power, but no power to the LED strips and display is okay because I did a flash light test. I do both image of the menu are on there. What else am I missing. I did see a resistor was out, no beep and no read in ohms. I also checked the LED White plug on the power supply. Is one side of the TV is out, leds? Is the whole TV wont show don't display on? LED strips.
If U have no Voltage to the led circuit; U have to make sure that ur getting the "LED ON or BL ON" voltage to the Power Supply from the Main Board. If so then U may have an LED problem.
They've been adding it to stop the high voltage attracting dust and fine hairs being electrostatically attracted to the pins. Most of the boards from Samsung after around 2011 seem to have this. Earlier boards collected quite a bit of this rubbish and many boards died because of it if the humidity got too high.
what cause's a tv to come on...then the entire screen goes one solid color....then it will work sometimes and sometimes not...its a flat screen LCD model...about 3 years old.
Most of the time, if the gate is shorted to the source, I'd be checking the resistors from the gate to the driver chip. Most of these circuits have a low ohmage resistor and cap there to slow up the gate turn on just a little bit. If they're shorted or open, the driver chip has also taken voltage it shouldn't have and will need replacement. The driver chip output pin should not be a short to ground either. Getting specific driver chips can be a real hassle if you want them quick as there are hundreds of different ones (for both the pfc and switcher). I seem to live 3 or 4 weeks from anywhere. I like your videos but, please don't do this without an isolation transformer and never reach across a P/S board to turn on/off bench power. Also, that fuse shouldn't be a glass envelope type, they go bang with bits going everywhere. You had me cringing there.
Thank you so much for taking us all on the entire journey. So many videos stop at just replacing the power supply. It is so cool to see individual components replaced and your diagnosis to get there. Thank you for taking the time to make this video.
Great video, my TV actually blew an internal fuse on the power board so that'll need a new one soldered on, this video has helped me understand a lot more to look out for thanks
That white silicone stuff is actually thermal silicone paste. It’s designed to transfer heat away from the mosfets. I like your video man. Thanks for sharing. I thought I heard you inquire about what that stuff was there for...
Im slowly becoming the best at this all because of ur tutorials u the best bro.🔥🔥 thank you very much and god bless 🙏🏾
Thanks BigDog, I followed you through on my Samsung 50" PS and determined it was ok.
Quick tip for people when you have repaired a power supply either adapt a mains lead or pull one leg of the fuse out and in place put a 100w filament bulb in across where the fuse goes or in series with the mains cable.... if the bulb glows like full on there is a short if it’s dim and like pulses it’s all good to go...... saves blowing up parts you have just changed
And BD at the start it looked a bit sooty on the white silicon as if something has gone bang keep up the good work 😁
👍 Cucumber Man!
That's a good tip to know. Thanks
I'm going to attempt exactly this for the first time. Thanks man
It worked!! I replaced the mosfets. I've never worked on a TV before. Thanks again
your probably right about the overheating. it's like putting on a winter coat to cut the grass😃
Big Dog is smart as heck!!!! I love watching his videos.
We all smart but the differences is education. But any how this guy is very nice showing his knowledge.
@@elchorisonn That's optimism at its finest. I promise you that most people are not smart enough or have the aptitude to conduct micro electronic repair, troubleshooting or component replacement. Along with technical ability and background, the willingness to attempt repairs such as those is required.
That was Outstanding!!!
You could easily be an instructor!
Thanks 👍
Hey Bigdog!!! I really wish I could talk to you about a tv I just bought! I subscribed and have learned quite a lot just watching your troubleshooting and repairing these various tvs! Awesome job!!! The tv is a Samsung UN65J6200AFXZA that had sound, but no picture, had backlights but a few of them were out and all 6 rows light up. Replaced them with new set, changed the T-Con board now NOTHING works! I only get 8.82 DC Volts going to the main board... I have replaced the T-con twice, the power board once and everything has progressively gone from hopeful to zero and it bugs me! I really want to get this tv fixed. Help! LOL... Any suggestions Bigdog? I appreciate anything... I'm befuddled..LOL Thanks man...
After seeing the close ups of the MOSFETs it looks like the white stuff is RTV silicone used for insulation between the legs also works for corrosion prevention in exposed environments.
Solastic compound is used to keep stuff in place it seems so if you have to solder on the bottom of the board you can throw solastic on the component solder flip it it over and solder it in most likely. Similar to what they do with flux you can use solastic for holding the component in place. It really has no net negative effect its not electrically conductive. However there is no reason why they wouldn't do things like this to make it a pain to fix however its more likely it makes it easier for them to solder. ;) If they do it in steps it makes sense. This station sets everything next station solders etc... Its not needed though you are right about this.
The white silicone is for vibration control and the heat /cool process so that it reduces bad solder joints as far as i know.Also large components use it as the mass is larger and helps hold it.
I love the way you teach as you go.
Greetings my Brother a job well done,,for those who my not have had Theoretical experience in Electronics some of your explanation may sound like Gibrish to the unlearned ,,Praise God at age 28 i did this course with NTS of Los Angles California,,stiill with an elapse of 8 years away from Electronic Repairs being in Curacao in construction ,,my profile photo is while i was in living in Curacao for 8 years remigrated back to Suriname in 2016 ,, Still !!! Theory is very important,, luckily at age 64+ my memory bank still functions thus at the said time i started in the 1980,s with Tube/Lamp RCA ,12 volt Samsung etc etc etc TV,s ,,all in all Theory is a stepping stone ,truthfully is that i have learnt a great deal from you,,keep up the good work ,One Love from Suriname the Caribbean,South America, My Brother God Bless
Thanks man for your story have been learning electronics from the internet for the last few years while practicing phone and laptop repairs, am now in preparations to set up a reputable electronics repair company here in East Africa
Great video , thanks. On this exact board I am not getting the 13volts at the output connector. The fuse is not blown and the tv does not turn on nor is there a standby light that is lit. I checked the diodes and they all seem fine .What other component or components would you suspect? Where would you start?
I enjoy the repair process you describe during your repairs. Very straightforward. Great job!
Hi buddy, i have a sony home theater smps here. Theres primary voltages present but absolutely no voltages on secondary. Am i missing something here? Caps are good, optos are good, smd parts are good. All tested. Still voltage missing. The model is Sony Hcd-Fxg9k
Great video.....I have a Samsung 75" Q70R and it went black screen while watching a movie, it flashed blue every 20 seconds, I have some knowledge in electronics so I opened it to see if it had bad capacitors. With the TV energized, I disconnected the ribon cable that goes to the main board and the screen turned blue, so I assumed it was not the damaged screen, I have been looking on ebay and I have found the original power supply parts, do you think that replacing the board will solve the problem?...thanks
I would say Mainboard. Just a guess though.
Did you find out what the issue is? Because I'm having the same problem.
Turn the TV on at the plug socket and my screen comes on for a few seconds then turns off, and then repeats the same process over and over.
in that case the silicone is for electrical isolation, note the isolation slots in the pcb between the holes
I assume there is some kind of fire hazard if dust builds up in there
its not for vibration as those arent free standing components, they are screwed into the heatsink
its not for thermal transfer, again they are screwed into the heatsink for that purpose
Your the only person that's correct to Big Dog's question ......That I have read so far.....
Good video man, thank you for the effort.
I have a TV I just replaced the backlight led strips. Power supply fuse is good too. But still they don't light up. What could be the cause? Are there other points on the power supply that I should check? Same model TV
Bro nice channel❤ it !!! However i think that white silicone glue stuff is for explosion/projectile protection fir us technicians so the components will not become a bullet if it blows out 👍 think about it only the HIGH POWER COMPONENTS HAS THAT GLUE ....
Great video, even though it's a bit too advanced for me. I have a question here:
I have a 7 year old 46 inch Samsung TV (UN46F6350AFXZA) that was hit by lightening. The TV is completely dead, and so is the Blu Ray player that is connected to it. The other electronics connected to the same power strip/surge protector are fine. Should I even attempt to try replacing the boards to try to fix it? Or could both the power board and main board be fried and it wouldn't be worth it. Just hate to see the thing goes to waste. Any suggestions would be much appreciated.
Honestly, I'd start with testing the fuse and replacing if bad. Fixed one of mine, nothing else was damaged
Just picked up this tv with no power at all. Fuse is good and MOSFETs are also good.
this video was very helpful to guide me along in repairing a TV power supply board.
sir , lot of thank for t.v repairing video in very simple way.
Great explanation. Learned alot from you.
Awesome, thank you!
I have the same tv but when I turn it on in the dark and flash a light to the screen I can see the words when I turn off the flashlight I can’t see anything..I’m guess it’s the led lights what you think? Do I have to get a new board?
I really really like your video. it's very informative and you make it easy to understand.... thank you
Thanks Sonia!
your welcome... got to leave this kind of stuff to guys like you.. yesterday I tried to see if I could figure out why my Samsung smart tv wasn't working. everything was going so well. had it all apart, no broken or lost pieces had the circuit board out and was seeing if I could figure out the problem... anyways I must have touched something I wasn't meant to touch cuz it zapped the crap out of me! that is one strong jolt! aside from being taxed by the cops I've never felt a stronger jolt
Thank you so much! Very easy to follow, love your teaching style.
You're very welcome!
Is there a way for contacting you straight? Email or something? I have a Samsung tv that has power only every other day. Sometimes it works for a day or two but after I turn it off it has no power (no standby light) only way to get it working again is unplug from outlet and wait few days. Tv itself has no buttons for reset. What can cause it?
the white stuff is a compound that's applied to keep parts from wiggling loose, and keep dirt out. I used a lot of it when I was in the Air Force.
Hi,
it is more for prevent of subsonic vibrations, which can be heared sometimes from low quality power supply and can cause damage to the soldering, too. Sometimes you see some kind of wax for this purpouse, sometimes silicone and sometimes parts are completly covered with epoxy.
Hi Big Dog, I have the exact same TV power supply board and TV model. I get a blinking red light and tested all the fuses and mosfet and it all looks good. TV will not turn on. Am I missing something?
Yeah check the capacitors
Great job! very informative and easy to follow along. Keep up the good work.
A question at the 5 pin connector where you said the stand by power is. I have two of the 5 pins marked as ground (GND) on the 2nd ground pin I have 12 volts, measuring from the board ground screws to the ground pin! This would indicate to me that the power board has a short? What do you think
Hi BigDog, thank you for posting your helpful and professional videos! I've been repairing a Samsung UN60J620DAF, and could use your expertise. It started out flashing the picture on and off, I would gently tap the back of the TV and picture would resume, but after a while of this, the picture flashed off and didn't come back. Still had sound, so I ordered a new TCON board and installed it. With that, I got the picture back full time, and the sound was still good, but now there is a pulsing of the picture. It pulses lighter and darker at half second intervals, so rapidly. This happens in all input modes, after adjusting all eco / power / video settings and resetting / restarting everything. After further inspection, I heard a buzzing sound coming from the power board, so I ordered a new one, installed it, but still have the pulsing picture problem. I have also replaced the LVDS ribbon cable with a new one. What do you think could be the problem / what would you suggest I try next? Thank you!
UPDATE: I opened the TV up to the LEDs but cannot identify any that are burned or that don't work. Any suggestions on how to move forward? I don't have an LED tester, I just turned the TV on while the LEDs were exposed and saw them all light up very brightly.
I Remember This Video From Before
Now That You Mentioned Replacing An 8 Amp MOSFET Transistor Being Replaced With An 11 Amp Transister
Hi, i have a Samsung UN60J620DAFXZA EA03 and the power light is blinking/flashing with no picture or sound, tried the reset, plug in-plug off but nothing worked…i don’t want to throw away and trying to fix it myself…i don’t have all the tools but i can just replace the entire board…What do you suggest and where can i buy the replacement?
what do you use for heat sink compound what do you recomend
Hello Big dog. I only have a cheap harbor freight centech multimeter. Is this sufficient for any and all tv repair related testing?
Yeah as long as it has a diode test.
Thank you for your video sir i do appreciate tha☺
Thank you for the video Big Dog! Regards from Buenos Aires, Argentina.
Thanks alot for this Great Video. You saved the day for us....
32:40 Can you tell me the brand & part number of that heat sink compound that you used on that Mosfet? Thanks
Do you know what courses i can take to learn electronics?
Thanks for the knowledge sir
I have a group of 4 diodes that appear to have a burn mark on board below them near my LED plug. I have no back lights at all, but standby light comes on, but flashes a few times and stays solid. Any idea if its bad LED's or bad PS? It shows im getting about 414 DC volts in each of D+1, D+2, D-8, D-9. Is that good or bad?
New subscriber , your awesome man
Thanks for subbing
Replace that blue cap! Your meter applies 1 volt to the part, yes, it may not show a short. But when you apply 500 volts it won't be good!
My 55 inches curved Samsung smart tv doesn't show pictures. It only makes out sound. How can it be fixed?
Can the power supply be forced on while out of the TV to check LED voltage? and what should the voltage be? Do I jump the 12v to PSon to force it?
If U appy voltage to the PS on (should be less than 5v 1A) its only going to turn on the 12v and 5v supply. There should also be a BL on (Backlight On) pin too. U can try to do it that way just starting at about 3v and go to no higher than 5v. I never tried to turn on the BL circuit with the board out of the TV, so don't really know if thats going to work, but it should. Good Question though! Thanks for watching too.
@@bigdog8882 I found the answer by mistake, the power supply seems to be on, when the mainboard is disconnected(at least mine are) The backlight power as well, The standby in your video is 12.7 v meaning it's on, vs the 8v when off, I have 300+v on the backlight terminals as well. When I plug in the backlights the power supply quits, it seems my LEDs are shorted as well. resistors are good. Thanks for the reply! Keep making great videos!
@@speter60 Note, If you unplug the connector from the Main to PS board and the backlights come on, then your Backlights are good. Probably have a mainboard issue. I forget that this TV use's a low instead of a high to turn on the BL's and PS board.
Some times 2 or more mosfet in a board apear as shorted but as you mentioned the problem is just one of them
But not needed to removing randomly.
Between them, the one is has short between mor than two pin's is the problem
Before you check both i knew the left one on back of board is the problem bro.
i have a 55 inch Vizio that made a pop and has no red light now. The power supply has a component that has some erosion could that clearly be a issue?
Thank you very much for the video.
U'r Welcome, Thank U for watchin
What should that last fet on the cold side read?
Good Job BigDog from the UK
Do all tv's work like that?
Hello. I have a similar board for samsung UN60J6200AF. I measured all the MOSTFETS, and AC fuse. All have no short. They are fine. My symptom is no power and no standby voltage (1.5V instead of 8V). What else could I look into?
I also have looked at all the caps and they all look visually good.
Bigdog/anybody, i have the bn44-00775a board for the 60in. No backlights, replaced them still no backlights. Old ones just flashed off and on nonstop with several burned out. New ones check out fine but no backlight when i get them into the tv. I have picture and sound. Measure 12.3Vdc to main board but 380-400vdc to the led d+. Legend says it should be 326v. Any ideas what to try next?
Check the components on the Power supply board (led circuit). Probably got a bad PS board. ua-cam.com/video/rRikZOVQw14/v-deo.html
Nice video very informative tnxs.
Most welcome
Thank you so much. Very informative.
just found you, really good stuff, thanks for posting, subscribed in the first 2 minutes.
I have the same model and my backlights aren’t getting any power. I can hook another power board up to it and the backlights power up. I hooked up 2 power boards up to it at the same time and it came on. I’m getting no power to the backlights on the original board. Help
You are really helpful Sir
Help, I'm at a stand still. I just buy some of those mofects? Those aren't the problem, check the fuse not blown. My components Ed are bit rusty. I got 2 TVs one is from 2015 and the other is from 2016 not sure if that matters. But its the same model of tv. So now my understanding is they both had power, but no power to the LED strips and display is okay because I did a flash light test. I do both image of the menu are on there. What else am I missing. I did see a resistor was out, no beep and no read in ohms. I also checked the LED White plug on the power supply. Is one side of the TV is out, leds? Is the whole TV wont show don't display on? LED strips.
If U have no Voltage to the led circuit; U have to make sure that ur getting the "LED ON or BL ON" voltage to the Power Supply from the Main Board. If so then U may have an LED problem.
Thank you very good job as a teacher
Will a Samsung 55RU7172 motherboard work in a 50RU7172 TV?
probably not, but its worth a try if you have it.
Hi, I need the outline of a SAMSUNG BN44-00787A and a new source here in Spain, thanks in advance
Another source about the white silicon is to keep the leads of the FETs free from dust to stop charges being built up on the gate lead
Thank you.
❤❤❤❤Love it🎉❤❤ good intro
Very interesting video, thank you for what you do. :)
My pleasure!
16:38 they use silicon to stop dust build up on the pins, and shorting them out
very interesting video thanks
Actually the white stuff, (rubber silicon) keeps the part from vibrating if the TV is played *TOO* loud.
They've been adding it to stop the high voltage attracting dust and fine hairs being electrostatically attracted to the pins. Most of the boards from Samsung after around 2011 seem to have this. Earlier boards collected quite a bit of this rubbish and many boards died because of it if the humidity got too high.
Nice repair!
you are very good always...good job man.
well done thanks
i would like to know if you have spare t-con for this
Sir where did you get those mosfet for less than 5 dollars?
Mouser, Digikey, Ebay, Amazon, etc. etc. etc.lol
can too much dust, almost like webs, on the board blow a fuse?
No
I Think The 11 Amp Mosfett Transister
Will Last Longer Then The 8 Amp Will.
Tnx, regards from Sabac, Serbia
Good Job Bro!!🙌👍👏
well done.Thank you
Does anyone know how to change the hertz on this tv on settings
what cause's a tv to come on...then the entire screen goes one solid color....then it will work sometimes and sometimes not...its a flat screen LCD model...about 3 years old.
Excellent!
Every time you laugh got me geekin 🤣
that white glue samsung likes using be shorting things out in time.
Most of the time, if the gate is shorted to the source, I'd be checking the resistors from the gate to the driver chip. Most of these circuits have a low ohmage resistor and cap there to slow up the gate turn on just a little bit. If they're shorted or open, the driver chip has also taken voltage it shouldn't have and will need replacement. The driver chip output pin should not be a short to ground either. Getting specific driver chips can be a real hassle if you want them quick as there are hundreds of different ones (for both the pfc and switcher). I seem to live 3 or 4 weeks from anywhere.
I like your videos but, please don't do this without an isolation transformer and never reach across a P/S board to turn on/off bench power. Also, that fuse shouldn't be a glass envelope type, they go bang with bits going everywhere. You had me cringing there.
Your good dog!!! Lol
the cap should have been replaced
MAKE SURE THOSE CAPS ARE NOT CHARGED!!!
My tv same model; turns on but then it starts flashing, but it only turns on once a day
Did you ever figure it out?
👍
👍👍👍👍👍👍👍👍👍👍👍👍👍
Can I send you my Power board so you can fix it.. NO picture but I do have sound?
Probably not power board but a back light problem.
Big dogg🤝
You can just use a piece of aluminum foil for the fuse.
Lol.