fixing flat two tv screens

[rookiecap]

I am trying to fix two flat tv screens. They have problems that I am not familiar how to deal with and if they are fixable at all.

1) the first TV is RCA 32: LCD combo tv+dvd, model RLCDV3282A-B. It was distorting images in sync with sounds. The sounds were distorted too. Then it was shutting down automatically. I replaced all visible electrolytic capacitors on power supply board. After repair, the image and sound are restored but tv still shuts downs unexpectedly usually after couple of minutes. I do not know what to do next. What might be the culprit and how to trace/inspect the source of malfunction. How to fix this problem.

2) the second TV is Haier 32" TFT-LED LE32F32200. Everything (image/sound) is okay except it has a little darkened are in left bottom area that takes about 1/4 of the screen. It is more shaded/darkened and one can watch the tv but it is a little bit of annoying and inconvenient. It does not look like capacitor failure in power supply but something else. Changing shade/brightness does not solve the problem. What that might be? What steps should I take to find the culprit? Is it fixable?

I appreciate any suggestions. Thanks.

[nomoresonys]

Post a picture of the Haier screen you speak of, being that it's from around 2013 it's likely bad led/s in the backlights.

[rookiecap]

I posted photos of Haier tv. The shading occurs in left bottom corner. Could it be a dented polarized glass? Or like you said, backlight is out.

[nomoresonys]

Sure does look like some bad leds in backlights, being 32 it's a lot easier to deal with than the bigger screens, I'd carefully take it apart, (STILL need to be very careful how you remove the panel by not lifting it wrong, if it breaks or cracks it's game over) and check backlights with a multimeter, a ton of how to videos at youtube on the subject.

[nomoresonys]

Guess just for good measure, once you get the panel driver boards exposed, which are sometimes very easy to access and sometimes under a cover of some sort, make sure all the tab bonds are secure and not loose. Can just put a little pressure on where they connect to the long thin driver boards and see if there's a change in display but it's unlikely that and more likely bad backlight led/s.