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{771} LED TV Backlight Turns OFF, Few Seconds After Power ON
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- Опубліковано 14 лис 2022
- LED TV Backlight Turns OFF, Few Seconds After Power ON. the led tv backlight inverter led backlight driver ic was receiving enable command from the processor but it was turning off within few seconds, reason being that a polarised capacitor was heat up and it was drawing more current, causing to overheat hysteresis shut down. it is using MP3394S String White LED Driver
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#ledtv #backlight #repair
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Few days back,same issue came in my tv, I opened the tv, saw the capacitor was in good shape, not blown so I bought boost module & fix the issue. I should have measure the capacitor farad value but I was in hurry.
some times, the capacitor is good
inverter IC, or mosfet is problematic.
sometimes input capacitor (input capacitor to the inverter module) also makes problem
and sometime DIM/Bright and sometimes Enable signal is missing
G ive an introduction to boost converter.plz
Thankyou soo much. This video was the only reason I could fix my TV.
My friend you are very good teacher and person, God bless you and all your family . My head very hard, i trying to learn then returning back to basics 😅
Good mentor in applied electronics. I salute you brother.🇵🇭👍
best regards
That’s really nice, showing the good food! 😊😊😊
2:52 ألف صحة وعافية على قلبك يا غالي و شكرا لمشاركة الفيديو
علی قلبک یا اخی الکریم
am great full my friend as from now I know what is electronic bcz of u. big up large I love your videos
Amazing video dear friend, have a blessed Wednesday 😊
best regards and special thanks
Informative vedeo. Thank u so much.
Sir you the real master of smps circuits. A detailed video on apple macbook magsafe adaptors is highly appreciated.
💯👌
🙏💞pranam Teacher valubal teach 💞🙏
best regards
Ooooo künefe .Bende çek severim.Afiyet olsun.Türkiyeye yolunuz düşerse birde burda beraber yemek nasip olur inşallah.Saygılar.
Very good information.Thank you.
You are welcome
Thank you brother today I replaced the faulty condenser which is popped out... Now Kinda 32 inches TV working fine...
Last night I watched the video.... Today fixed it... 😁
Konka 32 Inches TV....
I really like your videos all the way from Nigeria 🇳🇬. Thanks so much. Please can you assist me with know how to read, and interpret electronics /TV schematics?
Thank you
Very good and useful information sir thanks for sharing this knowledge to us
best regards
Great it worked !
Good One Buddy!
Very useful vidéo ! thanks à lot.
wow great info
Well done!
best regards
So many different designs working slightly differently. I got a Panasonic with backlight on then off. TV worked for a short time while testing but went bad again. So far I am suspecting corroded joints on led strips.
ALSLM BROTHER👍 ♪
wa alaikum salaam dear brother
Sir Exelint information vido great tech super
It's very interesting bro . may God bless you I have problem with my tv it turn off after few minutes what the solution?¿
My vu 43 inch.very dim flickering display for few seconds and switches off.any recommendations?
Master, you're very good. God will bless you handsomely
Pls master, upload videos on ups / chargers....like that SU-KAM 3.5 kv, 48v fusion type .. your boys need them please master
Very nice sir.
it is my pleasure
Nice sharing
best regards
Hello, Master is tired in the replacement of parts and I think it is right to use an old part, I think it is best to use a new part. ok
yes
you are right. we must use new parts and with best quality. i just replaced to verify the fault condition. when we are confidant about the fault then use best quality parts.
I wish you a good day Mr Haseeb. I have a TCL U49P6006 here. It seems I didnt see that the backlight was off and ordered a spare Power Suppy Unit Board. It worked right out of the box. But after a day the Backlight went off. Turned TV off and on. Worked for minute, then turned off. Waited some time and it worked now for an hour. So I'm not sure its the PSU Board or the LED stripes. Or even the Mainboard... Just dont seem to understand what the problem is. Now I could also reproduce a behavior. By regulating the brightness down, the backlight turns off completely, while moving from brightness level 100 to 60 or 70. But even on that way down the brightness didn't got lesser. Is it the led stripe, the mainboard, cable?!
Good informative sharing 👍
thanks a lot
Thanks a lot. I have exactly the same problem with my TV (17IPS19-5P Vestel power board) but when I test the capacitors (two 33uF/100V) at boost converter output they seem like okay. They're visually okay and their capacitance is also seems okay. I've also checked the output diode and mosfet, they are in good condition. I've even replaced the controller IC (the same IC in your video) but I could not get any result. (Turn on signal is active from main LCD board)
please check enable signal at pin 2
and DIM/Bright signal at pin 3
current sense signal at pin 13
Over voltage protection signal at pin 12
oscillator components at pin 5 and 7 are good
if these components are good and signal paths are clear. then it must work
@@HaseebElectronics Selamun aleykum. Sure, I will check the advices you pointed out. However I will try to replace those caps at first because I just test them simple way, did not try with another cap like you did.
Thanks again.
Yes mester haseeb may be the backlight led problem.
If everything good
@@-koora2day744 I wish it was backlight LED problem. At the end, I got tired of dealing with so small SMD components and replaced backlight circuit with a very crude boost converter. It is working now but slightly dim and not adjustable.
Thank You Sir!
Most welcome!
a question here please.to what degree we can trust the measurement of capacitor through multimeter?thank you for your great effort
best regards
while testing with multimeter, if the meter reading is within capacitor value +/-20%. then it is assumed soeme working capacitor
best way to test capacitor is testing with ESR meter
Best video
best regards
Nice 👍👋👋👏
Hey why is my solarpanda tv turning off after 5 seconds?? Or it because i don't want to use there betterie power supply???
Hi?...help me I changed the LED TV board Tp.V56.TB801 and after I put the other board the Tv is showing pictures UPSIDE DOWN..help me what can I do to solve this fault,?
Walikum Salaam Janab Bhai Sahib
thanks a lot bhai
Brother ek video lcd panel (scaler pcb) ki repair par b bna do please..... CKV tracks ki cutting karne k liye ckv line ki pehchaan kese ki jati hai k ckv track konse hain
👍👍👍
I have the same issue with my TV but there's no capacitors fat, any help jazakallah
2 like very nice
Sir kindly reply kejea ga...
Sir Meri LED b 2 sec k baad off ho jati he blink day k same circuit he jb k voltage stand by 38V rehtay hn jb power on krtay hn tu 2 sec k lea 107V pay jatay phr 38V ho jatay hn capictor b change kea hn
Nice
best regards
My samsung Tv has got same issue, when power on backlight comes for 2 seconds then goes off, channel audio comes from tv, but no light, i checked the 100v 47uf capacitor , it's capacitance values are okay. But still same issue, checked the MOSFET of the boost coil that also good, what should I check next
What happen when the voltage go away completely after turning an?
Backlight voltages start up 67v down 19v helps me tv 32 inch
sir can you give me the power section diagram
My lcd backlights comes on with pressing power button then turns off after short time.How can I troubleshoot.thank you
Soldering iron with desoldering gun details sentme available in India
You speak Arabic and thank you
Sir how remove noise frome power line in a 3v transformer power supply for an am radio receiver
I changed my backlight it was working, after one week backlight dont come on, when I toched the connector of wire that connects power board with mother board backlight come on and works for 1h after that they work dimed barely see the screen, anyone nows?
are you in an arab countery, MR Hasseb?
Sir led board ki hindi ma full playlist bnayie sir plzz
okay brother, i will try my best to do it soon
@@HaseebElectronics thnkuuuuu sir
Selamunaleykum , please. Add Turkish subtitle option.
👌👌👌👍
thanks a lot dear brother
Thanks please make this video in urdu and explain about combo power supply
💯👍. 🍰😊
best regards
Sab Bakws or joth bol ra ho
shukriya bhai ji. lekin mein jhoot nahi bolta aur jhoot bolney walon se nafrat karta hoon
@a2d
I have the same issue with my TV but there's no capacitors fat, any help jazakallah