ULTIMATE LCD TV REPAIR SERVICE GUIDE for TROUBLESHOOTING BOARD VOLTAGES
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- Опубліковано 18 чер 2024
- ULTIMATE TV REPAIR SERVICE GUIDE for TROUBLESHOOTING LCDs, guía de reparación de tv, how to use multimeter checking voltages on power board, main board, tcon board, inverter board, audio board, rectifiers, transistors, regulators, VCC, inverter on volts, tcon volts on Vizio, LG, Samsung, Sony, RCA, Emerson, Hisense, Insignia, JVC, Magnavox, Panasonic, Philips, Sanyo, Sharp, Toshiba, Westinghouse, Zenith,
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+Tampatec I need your help please. Please review the comments from Bruce D. Thanks
Is there a way to check the amplifier chip to know if its bad ?
Great video
120 volts?!
That is 100 volts too low. Normal is 220 volts.
No wonder the TV is not working properly.
Tampatec t
Thank you tempatec , I have never fixed a TVs but I am inspired and empowered to the possibilities thanks to your freely given directions and advice , I love how clearly you explain and demonstrate ( spell it out ) for us newness, I recon I will have to listen many times for it to sink in but your fully explained videos leave no stones unturned ( hopefully lol)
Your videos have been super helpful, especially this one. I recently took a job as a repair tech for a local college fixing a wide array of things, one of which are tvs. I have no experience with diagnosing tvs. This has been a big help. Thanks.
Thanks you @tampatech, this video really helped me fix my 65in RCA led TV. I thought I was the PCB since I kept getting weird reading when checking the stand by voltage but I turned out to be my multimeter. The main issue was the Main board, which this video really helped me diagnosing the issue.
Really enjoyed this video and realize it's older but I'm struggling with a LCD backlight issue and can't find any decent info. Your video was by far more informative than anything currently on line.
Would love to get some advice if your still responding to comments.
Have a Vizio VX 37l with standby voltage, backlight flashes then out. Tested all voltages on power board as good, bought new inverter board on eBay, same problem. Don't know where to go from here!
Your tutorials are Excellent. Thank you very much.
Owen Newman
You are just so knowledgeable. Very impressed
Another for my TV repair playlist.Love your Vlogs.
Thank you.
+DizzzyKipper thanks
This video was amazing THANK YOU. If you could ever show the samekind of thing when dealing with the tiny ribbon cables and testing the voltage that would be amazing. Cheers
Always enjoy your videos, really informative!
Great videos. Got a tv that was my Dad's who passed away it quit. Bought new one two years ago when wife got cancer. She passed away a year ago. I dont normally try to mess with these TVs but these have the memory behind them.
I'm tech savvy but needed these voltages and basic functions to see if I can Isolate . The newest TV is a Phillip's not even two years old no light. But I had some voltages, wasn't sure of what volts where. Thanks.
Thanks for this very informative video.
I've got to wonder if you've ever done a video on replacing a bad IR sensor on aTV? I'm not looking at replacing the sensor board, but the actual IR sensor. I'd like to learn what's involved with that repair.
Thanks a lot, Tom
Thanks for your videos especially this one ive been repairing tv sense ive seen your videos, thank you Tampatec
Great info love the way you explain everything love from Ireland
Thank you Sir for the basic points of trouble shooting in general.
Hi,tampatecYour videos are very helpful, Thanks
Great tips and how to. Thank you.
Thanks for sharing your worthwhile information. 🙏🙏🙏
Great Video. Keep up the good work. Mick
Thank you for the informative video. I have a Sony Bravia, just over 1 yr old that turns on, but then starts to power down and then back on, off, on, etc. Now at least I have somewhere to start.
Thanks for the video and it’s been helpful
There is so much useful info in here it's crazy.
your videos are very helpful thanx for uploading
Hi Tampatec,
I know this is an older video of yours, but the information on checking voltages is timeless. I was just given a Coby 39" LCD TV that is totally dead. It's from around 2013. I'm going to check the voltages, but I suspect that it's the power supply. Something you mentioned in this video at the 3:31 mark is if the bridge rectifier is shorted, then it will take out the ...... something. Did you say, "fuse"? I'm still learning, so knowing exactly what gets taken out would be helpful. By the way, the fuse on my power supply is good.
Thanks a lot, Tom
I have been a lot of time to learn .... How a simply to check the voltage stage by stage thank you sir❤
Thanks for another informative video
very helpful! Thanks a lot buddy.
I wish I had more thumbs. Great video ✊
thank you for your videos amigo
Great informative video.
very well explained and very helpful
THANK YOU TAMPATEC !!!!
I hope you make good money and live a blessed life because you are very smart and devote a lot of time sharing on UA-cam I've learned a lot from you! I have a Panasonic 2013 LCD/TV model TC-L58E60 POWER SUPPLY TNP A5807 2 that was given to me it won't turn on and I'm a beginner with TV's and don't have a lot of money to put into it and I would rather repair whatever board is the problem if you get a free moment I would just like your advice on where to start with this model and if there is another brand closer to Panasonic that you already have a video I should watch? THANKS AGAIN !!!
Very good informations and tuitorials...
New sub. here. Good vid. I learned some things,thanks.
AWESOME SITE AND VIDEOS THANKS!
Thanks buddy very good video 5 stars
Hi Tampatec, I think your tv help videos are a fantastic help especially to people that have knowledge of electronics but are not tv engineers, I have fixed many TV's with help from you and others on you tube, but I think one of the main problems is cracked screens, there don't seem to be anywhere in the uk supplies new screens and they are a hell of a price even second user, so many good TV's are scrapped because of this,, it hurts to pull apart a really nice tv and scrap it,, ron south wales uk
if laptop and monitor screens under 32 inch which I did a video, but bigger screens is too costly for manufacturers maybe cause high risk of damage when shipping, that's my guess.
Since the screen is the most expensive part, those cracked screen TVs should be used explicitly for donor electronic parts so that easy and inexpensive repairs can be done on intact TVs. If selling the electronic boards to places like Electroparts for some salvage value or extra cash was made more popular, then their would be a lot less shortage of parts to fix good screens.
Excellent Video +TampaTec! Very Informative!
I can now attempt diagnosing my LGTV besides replacing Caps :D
Cheers M8!
+Ayleid Ruin good luck, if you need help just ask 8^)
good information,appreciate it
thanks for sharing, subscribed.
Love your videos. Have tried all in above excellent video. Fuse good, bridge rectifier good. Power board output Connector only has one place where there's voltage and it's 4.91V steady (standby light on, no display), no other voltages present whether tv on or off...replace power board? Thanks mucho!
Keep up the good work
This is Bill in Las Vegas You do good work I have learned a lot from you. Have you seen Alligators In Tampa?.
Hi, thank you for this very useful video, even though it is 7 years out of date. These circuits don't change. One question though. Would your fluorescent light test on the high voltage cables to the back lights have worked, if the power was on, but the CCFL strips top and bottom were both broken and not working? Does the current have to flow through the strip lights to get fluorescence in your test lamp? I would expect so, but would appreciate your answer. Thanks, Dave
Great video: very well explained good job
Thank you
very good job thanks
Good bro! What bout a dvr? Do you know also how to repair dvr? If possble can u do the same guidance as this. Very instructional and helpful. GL bro!
fantastic explain pro thanks
You rock bro. Thanks
Hey :-). Love your vids! My question is, what to look at if the Bridge Rectifier INPUT doesn't read the proper voltages. The tv I'm currently working on is only getting 20v at the input :-/
Heay my man Tampa tec, much respect, keep up the good work and the good vibes. lock down makes me get involved with trying to repair TV, I learn from you. but I am not very good at testing for fault. I find a dumped LG 50 inch plasma TV Model No PD P50R10 100. main stby light comes on steady, no caps looks swollen, but the green light comes on the tcon. board when I unplugged the main board connector from the power supply board, I lost the green light plus power on red light on the front, Help. much blessings and thanks
what a nicest video, repair, I did not see it yet very interesting. Good job my friend
Hi
Nice to meet you
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Best Regards
John Peng
Hey Tampatec - great video! I have an LG 55LB5550-UY that has a black flashing screen. It passes the flashlight test so I know it has a picture. So far I have replaced the power supply board, T-Con board and Main board. I have also also replaced the LED backlight strips. It is still doing the same thing - flashing about once every second. At this point, I'm thinking that maybe the new power supply board I put in has a problem - what do you think? I'm running out of ideas.
thanks for this video.
Hi TampaTec. Thanks for putting up all these tv repair videos. Been trying to learn from them hoping I can fix this Sceptre tv that I have. I have a question. My TV is intermittently turning on. Actually there are weird things going on with it.
The standy light comes on if I let the TV rest for a few hours. As soon as the standby light is ON the TV can be turned ON. The red light turns blue and there's picture on the screen with no problem.
But after like a minute or so the TV just shuts down completely. No power and no standby light. You can't turn it back ON.
What I do is I unplug it and wait for like an hour or so, plug it back in then the whole thing happens again.
There's even times that the standby light doesn't come back at all till the next day.
I am hoping you can share some of your expertise on this.
nice video man u help me too much to know a repaire some smps :) thank u again
+badr linux thanks 8^)
Hi Tampatec you have answered a lot of my testing on board capacitors etc and the use of the mesr meter .Can you give us a type of meter to test thermocouples on air conditioning units and or one of your videos on testing newer inverter controlled boards on air conditioning units.This would be greatly appreciated
Looks like I found what I was looking for xDYou should add a link in other videos
Thanks for this deep troubleshooting, I have 75' Vizio flat screen with three busted capacitor in the power board, I replaced the 3 capacitor but the TV will still not come on though the capacitors rating was 68uf 450 but I was able to get 47uf 450 to replace them but still not working no single light anywhere
thank you brother
thanks for the great vid. I have a Sony kdl-46ex500 lcd tv. it won't power on. no standby light. I am getting 3.3volts to the main board. does this mean that the main board is bad? does this completely rule out the tcon? thanks
Great video well explained
Thank you
Great . Thanks
Thanks for your informative videos. I am replacing the main board logic SMP chip. This chip has a metal backing that I think may be a heat sink made onto the bottom of the chip. This chip does not come off easy without damaging other it and the SMP’s that’s around it. I am using a rework station and this chip acts as if it is (heat sink on the bottom of the chip) soldered. Any help would be appreciated.
Thanks in advance
superduper!!👍🏼😘
We have a Proscan LCD 42LA45H with sound but no picture. No image showing doing the flash light test. The upper four wire connection from the power board to Main board should be 28, 28, 4.9, 4.9 volts, I read 14.92, 14.92, 4.9, 4.9 volts is this the problem? Also would like more help on testing the T-Con on this unit please. Your videos are a great help,
thanks.
hi, tampatec. been watching your videos. and loving it. at 10:50 on this video, how did the lights come on. the lights were turned off so i am not sure what you did to have the light bulb turn on. it was magical for sure. induction? by the way, i've donated to programs that i thought was worth while, and there was an option which allowed me to do so. you should have the option for us to make a donation to you. i would love to support you for all the information that you provide.
Been following/subbed for some time and hoped I would never have to contact you. I have an intermittent screen problem with a Sharp model LC-C4677UN. Would you recommend that I replace the t con board?
This video was very helpful and informative. Thanks.
Nice helpful video! I
Hi, great video, my vizio is cloudy...could this be ribbon cable to panel? thank you.
Thanks! Liked & Subbed!
Tampatec,
Thanks for this video. I've done a little troubleshooting already on a dead LG, and I'm going to use this video to guide some more troubleshooting (although my TV is an LED, so there are fewer boards to deal with). Here's what I've done so far-
The TV is an LG 32LB560B-UZ.BUSMLJM. The TV does not appear to power-on: no video, no power indicator or standby light
-Verified power cord was connected to a good outlet and passing proper voltage
-Looked at both boards, no puffy capacitors, no obvious burns
-Ceramic fuses have continuity
-Measured voltages on output of power board using chassis as ground (all readings taken without attempting to turn the TV on):
Labelled 12v/12v - Actual Reading 11.7v
Labelled 3.5v/3.5v - Actual Reading 3.4v
Labelled 24v/24v - Actual Reading 25v
Labelled PWR-ON/DRV-ON - did not take reading
Initially, before taking power readings, I thought that surely this would be a power board issue, but those power readings look really close to me, although I don’t know the board tolerances. However, it seems strange to me that the 12v and 24v are constantly on, since I measured them without trying to turn the TV on. I would have thought that only the 3.5v would be constant.
One thing your video has got me thinking about is stability. I'm going to go back and check the stability of those voltages.
+Curtis Faulkner can be main board or power board but i would go for main board get at shopjimmy.com cause they take returns (restock fee maybe charged)
Thanks. I appreciate the suggestion and will likely go ahead and get the main board right after Thanksgiving.
Hello, Love your vid!! I own a Toshiba Regza 40xv648u LCD tv. It initially had the following issue: black screen with audio ok. I made the flash light test and were able to see the menu. Then I replaced the backlight inverter board. Now the TV seems to work perfectly fine (screen and audio are ok) but after few minutes the TV shut off and restart by itself. Do you have an idea what could be the issue? Thanks in advance!!
Great video TampaTec thank u for this. I will be free to ask u for help. My Quadro tv make me problems. It have power and sound but no picture. When I use lamp I see something. I was open him and on power supply I found one bed capacitor after change it work perfectly but just two days. First day after turning off and stand on stand by for a few hours I need to start him two times and it work. But after second standing on stand by it's no way to turn on. Probably same capacitor again. Please can u tell me why capacitor dieing when is tv on stand by. Best regards from Montenegro.
Hello Tampatec, and sorry in advance for my English mistakes. Thanks for your videos they are very informative and useful.
I was wondering if u can help me with the problem i have on my old 2007 lcd tv, it's a Lg model 42LY95 (it can be used as heater during winter :D ). So the problem is when i switch on my tv everything is ok but after 5 min, the image start blinking black and make pixels (the backlight are still on at that point).
About 1 minute after, the backlight switch off, i have only sound and the power button is still green, then i have to switch off my tv for a while, maybe 30 minutes to get any image and it's the starts again.
So i opened my tv hoping to see any obvious problem with capacitors or anything burned but nothing so my question is:
Do you have any idea where it can come from ?
Is it just a symptom of dying backlight and if it is, is it repairable and worth?
Anyway I will follow your tutorial and check everything i can with my multimeter and give update later.
Thanks for your answer if you see my message and keep up the good work, love your videos especialy the "repair tech stuff by myself". I hope u understand my bad explenations.
Greatings from France mon pote ;)
My relatively new LG 4k LED has a constant blueish tint/hue that can't be mitigated by any colour settings. Do you think I would need to replace the tcon board, the lvds cable or the entire LCD panel itself? Thank you.
Great explanations and demonstrations; trying to work on an LG374450 when it turns on gets image and sound - the indicator light goes from Red to Blue than after about15secs. lose everything and the Blue light turns to a blinking red. Testing the power board voltages pins going to audio - when it is on initially have (2) 20volt pins and (2) 3.5v pins and (3) 12v pins when the indicator light goes from blue to red blinking lose the 20volts and 12volts from those pins, been checking diodes but so far haven't found anything --- any suggestions
Great Video's I have a Toshiba 32" 32AV502U witch i have had for yrs. The trouble that i have now is i turn tv on the green light comes on it try's to come on and i start to see pic then it doesn't come on but the green light stay's on till i turn it off. If i cycle it several times maybe 6 times when the picture starts then it's fine and stay's on. I get the impression that when it starts it not getting enough Voltage
to stay on like a clinoid in a car. I haven't yet taken apart yet but i will in the future. do you any video on a 32AV502U with the same problem?
thanks Bill
Do you have any knowledge of those LCD LED tv repair guides online downloads, are they worth the money?
I like your videos. I've done some electronic repair in the USAF many years ago so diagnostics and repair is not foreign to me. What I would like to know is where can I find the normal voltage that I should see on the test points on my specific Samsung LCD TV?
On power board should read 3.3v standby even if tv isn't on. Try here, www.smarttvmanuals.net/samsung/samsung-tv-repair-manual-schematics/
I've got a Sony with a DC transformer input, what differences would I find inside of the power board?
thanks for your helpfull video.my lg tv 32lw5700 when power ON power supply board is ok that is realy is picked power on supplt is showing in theminal one is ok.But tv still shownig stadby mode and video,audio plz help
I'm having an issue with a NEC P462 multisync monitor. Getting a green light on power up then red flashing after 3 seconds.
Any advice as to approach this.
Thanks Tim
What do you suggest replacing a Vizio Smart TV 39 inch HDMI input
very good
Wonderful
Hi Tampatec , thanks for what you are doing for people.. I wanted to ask you if you would be able to help with my issue. I have Bauhn ATV-55 FHDED its led tv not older then 3 years. Iam I have a problems turn my TV on. It's always turn on I can see a logo and turns off and on again cycles. Sometimes starts to run. I check powerboard and replaced 4 caps which looked not normal. But no change. Still same problem . What I have noticed is that on SPON pin I have 4.4 V and Iam not sure if it's enough. Thank you for any idea
Template, I have a Sony KDF50E2000. Good condition and all. My tv's green power light keeps blinking and shutting down the tv while I'm watching it. I hear the fans in the tv running every time this happens. I thought it was a bad lamp. But that's not the issue either. What could be causing this and how can I fix this. I've been watching videos all day to try to troubleshoot this issue. Everyone has blinking red lights. I haven't seen a red light. The power light keeps flashing and shutting off my Sony tv. THANKS
I'm getting basically 2.5 v DC out of my 1st led pin and 40v DC out of the rest does that sound right? And about 3v out of my detection pin
Hi Tampatec .. for 230v system, what is the voltage of the bridge output
hey, I'm wondering if you could give me a hand to diagnose my tv to figure out what part I need to replace. I'm a fairly tech savy person but I can't find much information on the issue I'm having.
like your hat dude...are these available for sale? hey thanks for all you do,love your video's...keep it comin
Get TV boards at shopjimmy.com or electropartsonline.com
Help! I have a Sharp Liquid Crystal TV model LC-70LE550U the other day the picture froze and then went dark around the edges then slowly would fade out all but the bottom middle... then finally that would fade out as well. I would turn the unit off then on again and it would be good again but within moments do the same thing. Is this the T con board? If so... best place to purchase another?
Hi dear friend I have a lg 32lh20r. Manufactured in 1999 . Apears lines on screen when I just turn it on then after 5 or 10 min goes away .. they told me it maybe the t-con board .. I been learning about my tv end it appearly doesn't have a T-con board individually placed . Do you thing my tvs t-con board was built tongether with main board ? Looking forward to hear from you
I've been trying to fix a Vizio E220MV 22" LCD TV that has an external power supply. The problem is no backlight and no picture (blank screen with the flashlight test), and of course without being able to know what it's doing I can't test sound. It powers up and the invisible touch buttons respond by lighting up but I have no idea if it's actually doing anything. All the voltages check out fine and all the electrolytic caps look good. Any ideas of what to look at more closely?
Hi Tampatec, I have a Vizio D58U-D3 and it works except the left and right halves of the tv are different colors so it appears that there is a line right down the center of the tv. I already replaced t-con board, what else could it be?
Regulator sparked when checking voltage, I tested the middle prong on the regulator. Any suggestions?
I have no input signal on all HDMI inputs or av inputs. The power and main board are integrated into 1. Sometimes shuts off when trying HDMI inputs and red power led blinks 3 times. Would this be the main board or to con board?
i wish to inform readers about my experience in trying to repair a LCD Samsung 52" TV Some time ago my daughter gave me her TV set because it was completely dead . She wanted to throw it away and I strongly refused to do it. I promised to look at it and put again in operation. In spite of my age (88 years old) I started a research and I found this site. I have some experience in electronics because i am a licensed Radioamateur but without a particular experience in modern LCD TV. Of course the first thing i did was to look at the main power board.I changed all filter electrolytic capacitors apparently good but with a too low working voltage I substituted with 25 working voltage capacitors with a total expense of less then 10 $. The set was always dead except the stand by red light and the clicking of main switching relay. Audio was working but screen totally black. Then I started a very patient control of the various voltages present in all boards (main power board, logic board ,T Con board). I strictly followed the various suggestions of Tampatec how to proceed with my multimeter. All LCD were not lighted and i began to search some replacement board to recover this TV. The voltages were ok but no high voltage to drive the inverter board . Few days ago I was looking once more at the back side of the TV and I was bit desperate to find reason of the missing high voltage of the inverter. I was convinced that all was in order but no way. Black screen persisted. Then suddenly I had a very simple idea. A very banal reasoning. The voltages are ok but may be in some connector the electric contact were bad mainly for oxidation or for other mechanical reason. Then i started to disconnect all connectors of each board and with the special liquid for increasing conductivity i sprayed either the male and female connectors putting then again in proper position (feeling with fingers the small click when properly inserted. ) Et Voila Everything started all worked fine . Great satisfaction! I kept the TV on for many hours and days switching on and off just to be sure of my work. Hope that this experience could help others readers