Comments on: LCD TV Repair made easy #4

By: GrantsPassTVRepairs

GrantsPassTVRepairs — Mon, 08 Feb 2010 23:18:25 +0000

A real common cause for the kind of problem you described, is that the back lights on the TV are not operating due to a bad inverter board, but it’s difficult to guess at problems like this with out seeing the set. I’m assuming this is an LCD TV.

By: jaymanuelraida29

jaymanuelraida29 — Mon, 08 Feb 2010 22:50:43 +0000

yes the tv is an lcd. The tv also smells like burned wires . It turns on but the picture is black. There is sound coming out of the tv. And thank you for the fast response!!!!!!!!!

By: cvisme

cvisme — Mon, 08 Feb 2010 22:01:37 +0000

I have almost the same problem. Westinghouse 32″ LCD TV Monitor almost 4 years old (picture is there but not viewable – you can see what’s on the display by shining a flashlight on the screen, audio is fine, no burnt wire smell). I’ve found lots of posts online pointing to replacing the backlight lamp; your suggestion that it might be a bad inverter board. Appreciate the insight and the videos – very helpful stuff and I especially appreciate the pop-ups you have added – nice job!

By: GrantsPassTVRepairs

GrantsPassTVRepairs — Mon, 08 Feb 2010 21:44:00 +0000

Here is a video where the gentleman modified his LCD back light to work with an LED.
watch?v=BExEo-d1qkc

By: taygrib76

taygrib76 — Mon, 08 Feb 2010 20:47:44 +0000

I have a Samsung LNT3242HX/XXA same problem as the 32″ westinghouse as described above. Im getting about 1 second of backlight when the TV is first powered on. Is that an inverter problem or a bad ccfl?
Thanks
Great videos! Keep them coming!

By: GrantsPassTVRepairs

GrantsPassTVRepairs — Mon, 08 Feb 2010 19:57:13 +0000

I would start with the power supply capacitors and move on to the inverter board to see if your transformers are open or the lights themselves are bad. From what I’m hearing on the new LED sets they have a feedback circuit which can shut down the power supply if it senses a problem in your lights or the associated output transformers which often go open.

By: GrantsPassTVRepairs

GrantsPassTVRepairs — Mon, 08 Feb 2010 19:34:25 +0000

You can shine a light of your own behind the screen and see if your picture is there. That will at least confirm if there are additional problems other than the light circuit, but because of the way the feedback circuit works sometimes its hard to draw the dotted lines between the symptom and the cause.

By: taygrib76

taygrib76 — Mon, 08 Feb 2010 19:00:48 +0000

I’ve verified that the LCD is working after that one second of backlight using the flashlight trick. Im getting normal audio as well. After watching the video on capacitors, I tried the hairdryer trick on the 4 caps on the inverter board. I heated them up before turning the tv on, but the heated caps didnt do the trick. Also I tested the voltage to the inverter board and its reading 24.4V. According to a samsung troubleshooting guide on this model, its needs to be 24V. Thanks for the quick post

By: GrantsPassTVRepairs

GrantsPassTVRepairs — Mon, 08 Feb 2010 18:48:17 +0000

That trick with the hair dryer will not work if the capacitors are to far gone. Since you may not be able to get parts on your TV any way, it might be fun to see what kind of back light you can come up with on your own such as LEDs. I recently saw a youtube video on this. Perhaps more work than the TV is worth, but if your the experimental type it might make a fun project.

By: taygrib76

taygrib76 — Mon, 08 Feb 2010 18:40:38 +0000

In your experience with samsung lcds, what part is more likely to be the faulty part? the inverter or the CCFLs?
Ive found both parts online, but I dont know which part I should pursue. CCFLs – $10 to 12 a piece. Inverter board $70. I got the bad TV from my dad, who was going to throw it out, so if I can spend about $100 and a few hours to get it running again, Id say its worth it.
Thanks