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No backlight led tv. hitachi 42hxt42uh. no backlight. yes picture. yes sound. replaced power board and no change. I realize the led driver/converter is on the power board. thanks

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  • Hitachi Master
  • 30,785 Answers

Measure the supply to the LED backlight. If it is correct your LEDs have failed.

Posted on Dec 07, 2019

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6 Suggested Answers

6ya6ya

6ya staff

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Posted on Jan 02, 2017

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MICHAEL MULLINS

  • 927 Answers

SOURCE: DP23 LED not lit on deflection board no picture on tv

Good Day, Gil;
Your problem is in deflection circuit (115+v) check these: FP05, DP15, Q777, QH01, TH01, T701, etc. BUT suspect C707 1k pfd, 2kv, and check all the pico fuses (brown) 2" to the right of cap. Good Luck, big IRISH.

Posted on Sep 01, 2008

Steve Varnum

  • 1 Answer

SOURCE: LCD TV Has Sound, Backlights Work, but No Picture

I have been having the same problem with my LG. people say there are bad capacitors on the power supply board. I don't have the know how to replace them and don't have the money to pay. I can get mine to work by blowing hot air with a hair dryer into the back of my tv through the vents over the board. Heat it up for a couple minutes and turn it off and then back on and the picture comes back. I just never turn the set off now.

Posted on Sep 09, 2012

gopakumarg43

The Knight

  • 76204 Answers

SOURCE: lg led tv backlight

Fault with its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Posted on Feb 05, 2015

gopakumarg43

The Knight

  • 76204 Answers

SOURCE: How do I repair nonfunctioning backlight?

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/
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.

Posted on Sep 03, 2015

emissionwiz

Marvin

  • 85222 Answers

SOURCE: Samsung UN50H6350AF LED TV. No picture. I do get backlights and sound. (See pic) I tried replacing the main board and the T-con board and there was no change. Any suggestions? Try power supply board?

You have wasted enough money guessing bite the bullet and replace the TV. I have done this same thing and regret it to this day, should have just junked it.

Posted on Dec 02, 2016

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Hitachi LE55A6R9A has sound but no picture. Passes flashlight test. No LED backlights appear visible at all. Trying to determine whether to start replacing boards or LED strips first.


The led driver may be on the main board or on it's own board. Led strips don't fail all at once so if you had a dark area of the picture then I'd suspect a led strip. TV Parts Universal TV Stands DLP Chips ShopJimmy This is the place to get parts.

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Sanyo DP46142 TV comes on for approximately 30 seconds and then screen goes black. Power LED stays on.


Sounds like a backlight problem to me. If you input a signal to the HDMI or Composite input and then it goes black have you tried taking a flashlight to the screen to see if the picture is still there but just dark? That would indicate a backlight issue. That model appears to be an LED edge lit backlight, so if the picture is still there after going black your going to have to trace out the backlight circuit and see whats going on. Usually with LED backlighting if it comes on at all then the LED's are good, its just the driver supply thats failing to keep them on. Some TV's have a small separate board that provides the backlight control, but i suspect with this model its on the power supply board and not the motherboard. Have you checked that board? It could be bad caps on the power supply board, check the voltages to the backlighting when it lights up and then when it goes dark. It could just be some failed capacitors on the power supply causing that voltage rail to drop off.

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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.

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1 Answer

Have sound but no picture.backlight LEDs flash once on/off 1st on.can see picture on screen (any channel) using flash light...already tried new LED converter...all working then screen went black.


Back - light problem. 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://electro-medical.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.

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Why is my replacement LED Power Supply Board not functioning properly?


Power supply board is not the culprit - check out your inverter board which is responsible for the back lighting.

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On my Hisense 50K23DG LED TV, I have sound but no picture.


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1 Answer

Lcd tv has sound no picture


Hi Chad,
Since you are getting the sound, the main board seems ok. Please show a flashlight on the screen, you should be able to see the picture there. If it is so, the backlights in your set are not working. Most LED TVs have LED driver circuit on the power board now days. Here a word of caution, there are two reasons for failed backlights. First the LED driving circuit and second the backlight itself. Which one has in your case, let some TV Tech decide it. In both the conditions your TV should be repairable.
Good luck

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1 Answer

Hitachi 42pd6800 black screen when turned on, got sound no picture


Is this a plasma or an LCD TV? If it's an LCD TV then I would check the backlight inverters. If it's a Plasma TV then The Sustain boards there are two sustain board.


You can get parts for this TV at www.interliquidparts.com

Feb 29, 2012 | Hitachi Televison & Video

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