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My Sharp LC-50LB261U LED tv has no backlight, screen images seen w/flashlight. Replaced main board and power supply boards. No help! Will the T-Con board prevent seeing backlights? Pls advise..

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My Sharp LC-50LB261U LED tv has no backlight, scre - service mode-zayynrifmjs4mi23yoihwx4a-2-10.jpg

Posted on Dec 19, 2018

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6ya6ya
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SOURCE:

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Posted on Jan 02, 2017

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gopakumarg43
  • 76046 Answers

SOURCE: LG 50la6970 no backlight i have sound and dark images!

Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Posted on Oct 08, 2016

gopakumarg43
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SOURCE: 2nd try see last sentences....lg led 32ln5310 tv, sound but no picture, no backlights, nothing visible on flashlight test, what should I replace? Main board, T-Con Board, Power Supply board or Leds

The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

Posted on Feb 10, 2017

  • 85 Answers

SOURCE: I'm trouble shooting my Vizio e550i-2b It has power no backlights, image can be seen with a flashlight, I've replaced led driver board and problem persists, do you suggest main board next?

If you can see an image with a flashlight and you can control the tv with the remote then the main board is not the problem. You've replaced the LED driver board, so that leaves the LED strips inside the LCD panel as the likely problem.

Posted on Feb 12, 2017

  • 2794 Answers

SOURCE: LG 47LN5750 No picture

If you have backlights its not going to be the tcon for future reference. you have some shorted or open LEDs in the panel. Check the voltage going to the LED sets, should be 100 plus volts

Posted on Nov 16, 2017

  • 2794 Answers

SOURCE: Panasonic TC-L55DT50 has no backlight. How to proceed?

You have some bad LED lamps in the panel, its not a fun job to get at them and change them but if you watch a couple vids it should give you an idea how to do it, other issue is cost as the light strips can be expensive depending on the set and its size...Good luck!!

Posted on Dec 11, 2017

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My Sharp LC-50LB261U tv screen went black but i still have sound. i replaced t-con board and power supply board and have same problem. can you help?


I don't have a service manual for that set so I'm only able to help on a limited basis...Have you tried the flashlight test?...if the backlights are out then it could be a backlight driver board if it has one? or defective LEDs. See what you have for voltage going into the panel LED's

Oct 18, 2017 | Sharp Televison & Video

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I have a 32" Samsung LED TV with not picture. Audio is working.


Do flashlight test - if you can see image you need t con board. If no images seen, inverter board. TV Parts Universal TV Stands DLP Chips ShopJimmy

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T-con board or maim Board issue? Disconnected T-con from the main board and got back light! sharp lc-55le55ou


Hook the Tcon cable back up and do this. With a program running on the TV, shine a flashlight in the screen. If you can't see movement from the program, then the Tcon board is bad. you can get parts from here: TV Parts Universal TV Stands DLP Chips ShopJimmy

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How do i test a backlight for a led tv


Testing TV Backlight LEDs - YouTube

? 4:44
https://www.youtube.com/watch?v=eEJoPCa7Kt0
Jan 24, 2015 - Uploaded by swappart.com
... explaining easy way to test individual LEDs on a strip from aTV backlight. ... Sharp LC-60LE820UN TV - LED Strip Testing - Long Version ...

IT02 - How to Test LED Backlight - YouTube

? 0:55
https://www.youtube.com/watch?v=YmSI2N6BGPA
May 20, 2011 - Uploaded by LCDPARTS
How to use IT02 to test Laptop screen LED backlight.

LST04-TV, How to test LED TV screen - YouTube





Dec 26, 2015 | LG Televison & Video

1 Answer

Samsung LED TV (UN39FH5000FXZA) has audio, but does not have backlight. I replaced the power supply/ LED board with no success, could this be caused by the main board or the t-con board?


Hi Matt,
The fault lies with the backlight LEDs. It is common with these sets. If you open the panel and replace the failed LEDs, or replace the panei.
Good luck.

Dec 05, 2015 | Samsung 5000 Series UN39FH5000 39" LED TV...

2 Answers

LG 50ln5200-ub led TV . Has no picture but great sound . What is the problem ? I did the flashlight test and can see the faint picture which tells me the backlighting is out . This tv model is a Black...


usually bad power supply, Where did you source your part? return/exchange it. Bad LEDs/ possible but not as likely, Tcon working if you can see images with flashlight. You must also have backlight on signal from main board ,check for 3 to 5v on labeled connecter on power supply. UPDATE---47" & 50" LN series. This model has had LED problems if your TV acts as described by Mr. Hughes in is answer to this problem you have bad LEDs

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