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My LED TV TCL 40LED has sound but no picture. When started picture flashes for a second & goes off. Please suggest if LED driver voltage of Power supply is Good?

TV Power Board number is K-PL-0A-1.I think its LED driver power output is not good. What mentioned on board is LED DC power output as 30-120V but what I got at Pin 1& 2 as 24V on LED + mentioned. Can you please suggest what's wrong in this power supply board?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

javswr
  • 44 Answers

SOURCE: No Picture & No sound. Red LED, Green LED, Red LED.

If the power supply outputs are good! Then I would say the back light inverter is bad! If the screen stays black and does not come on.

Posted on Feb 28, 2009

  • 718 Answers

SOURCE: Vizio L37hdtv10a fails to fully turn on

You will have to isolate the main board and Inverters.
Unplug the inverters and turn on the set.
If it "turns on" then try re-connecting each inverter seperately to see if only one is causing the problem.

Posted on Mar 07, 2009

BoiseLCD
  • 63 Answers

SOURCE: I have a NS-LCD37-09 tv. No picture or backlight

Your main board is faulty. I've done several of these but haven't been able to figure out which component is actually bad these yet. I've simply had to replace the board itself, and it fixes it every time. One thing you can do to get your backlights to come on (and so you know I'm not Jive'n you) Is unplug the three wire bundle that spans from power supply to main board. This will usually make the backlights fire up. I even had one that after I left it that way for a minute (with the backlight on) it suddenly started working again! But this was short lived. :-(
One time I even tried recapping the entire main to see it that would fix it. It did not. I think it might be something to do with the small chip labeled SL37HA37. It's a 16 legged bastard near the 3-wire plug I told you to pull. It's that or possibly the bigger IC near it that has a heat sink on it. The ball grid array solder joints may be faulty. Just guesses, if any smart guys out there figure this one out, be sure to tell the rest of us please!
Thanks, Chris Boise LCD www.boiselcd.com

Posted on Apr 23, 2010

  • 11800 Answers

SOURCE: My TV has a 17pw26-1

No, the voltages are just fine. The fault must be either in the PMW itself or in the HT transformer - and the only way to fix that is to replace the entire inverter board.

Posted on Oct 19, 2010

  • 1 Answer

SOURCE: ILO LCD, Power supply issue, MLT169B. 24v output is dead.

I want to know R3 value

Posted on Dec 27, 2010

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I have a LG 47LN5750 that powers on, flashes a good picture for about 1/2 second, then goes dark. Still have sound & can see a picture with a flashlight shining on the screen.


Fault to the main power supply regulator section. 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. Surf the site with patience. 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.

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Check its 5V standby voltage at the main board. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

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im assuming it's the lamp however the error menu will tell me more
If the standby light blinks five times repeatedly, that's indication of a "Lamp driver error". The probable cause listed is, "lamp driver faulty". Its also possible that the internal antenna used to detect the presence of high voltage has become mis-positioned. The lamp driver provides the high voltage. If no high voltage is detected, it is assumed that the lamp driver is faulty.
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