westinghouse LD-4255VX right side dark

[lookimback]

Got a new project today. Westinghouse LD-4255VX. Problem is that the right side is real dark. My first thought was TCON but then I opened it and found that it doesn't have one. This is my first LED TV. Have to say I'm a little surprised after opening it and finding that it only has 1 board. Doesn't appear to have any physical signs of component failure. Any ideas?

Edit: I tested the power supply. It doesn't resolve like I would expect. It fluctuates between 18v and 19v. No way to open it that I can see.

[tom66]

Re: westinghouse LD-4255VX right side dark

46" version but same fix:
https://www.badcaps.net/forum/showth...ight=LD-4655VX

Easy fix if you know what you're doing and are careful around the LCD panel.

[lookimback]

Re: westinghouse LD-4255VX right side dark

I was reading that thread this morning. So it could just be the ribbon cable? I don't see the other end. I guess I will have to remove the front bezel to see it. Would that be correct? Also, thank you for the quick reply.

[tom66]

Re: westinghouse LD-4255VX right side dark

Looks like the front bezel side to me... but best to ask them as I'm not certain.

[lookimback]

Re: westinghouse LD-4255VX right side dark

All the LEDs light. I had to completely remove the panel and the screens under them to get to the ribbon cables. They are good though. I did use my tweezers to straighten out one spot on the other end of the cable. Maybe that was it. I will put it all back together and see what happens.

[lookimback]

Re: westinghouse LD-4255VX right side dark

All the LEDs light. Still dark on right side. Could the main board be the problem? Or, the panel could be bad?

[lookimback]

Re: westinghouse LD-4255VX right side dark

I just noticed that the dark side also has a slow refresh rate.

Edit: it looks almost perfect if its a white screen but dark images are too dark.

[lookimback]

Re: westinghouse LD-4255VX right side dark

Here's a couple pics. I also noticed that on the right side it flickers sometimes and i can see scanlines.

[johnboy1313]

Re: westinghouse LD-4255VX right side dark

I'm no expert by any means but I'd suspect panel at this point. I've ready too many bad reviews with the Westinghouse brand. Just my two cents though.

[lookimback]

Re: westinghouse LD-4255VX right side dark

I was thinking the same thing. I'm sure I can part it out and get my $80 back.

[lookimback]

Re: westinghouse LD-4255VX right side dark

Would it actually be the panel or something with the board attached to it?

[lookimback]

Re: westinghouse LD-4255VX right side dark

I'm beginning to think its not the panel. I've been doing a lot of reading and most of the TVs with bad panels will clear up a little if you flex the panel a little. Also, its to even. Its as if there is an invisible line right down the middle of the screen. Every thing to the right of that line is darker. From what I've seen of bad panels, its usually areas of dead pixels but not one was exactly one half of the screen. I'm leaning toward a bad IC, or some other component, on the panel board. I'm going to try to find all the data sheets for the ICs and see what they are and try to narrow it down. Hopefully, if it is an IC, I will be able to find a replacement. Would be great if someone had a cracked panel and could just tear the board off and sell it to me. I could then just use my rework station and swap the ICs one at a time.

[tom66]

Re: westinghouse LD-4255VX right side dark

It looks like the right hand LED strip is dark, it's possible for the main board to go bad causing this.

[lookimback]

Re: westinghouse LD-4255VX right side dark

It looks like that but from the back you can see its on. I actually removed the panel and tested it. All the LEDs lit. BTW, they are bright. Sunglasses would not have been a bad idea, Lol. Refresh rate is very slow as well. I connect my laptop through HDMI and move the mouse and it has a trail behind it. I'm on my way home from work now and will get a pic of this and post it.

[tom66]

Re: westinghouse LD-4255VX right side dark

Ah, if the refresh rate is bad it is probably the panel tab bonds that have gone bad. May or may not be fixable

[lookimback]

Re: westinghouse LD-4255VX right side dark

I was hoping that wouldn't be it. Here's the pic of the mouse pointer.

Edit: still though, wouldn't a bad tab leave me with lines or something? Would it affect exactly one half of the screen?

[tom66]

Re: westinghouse LD-4255VX right side dark

Bad tabs can affect halves of panel and also affect motion blur without any other problems.

Symptoms vary. Sometimes you have vertical lines, poor refresh rate, double images/stretched images, flipped image (very odd one!), wrong colour, blurred image...

[lookimback]

Re: westinghouse LD-4255VX right side dark

Is there any way to test it? If its the tabs then I'll just part it out to get my money back but would want to know for sure I was selling good parts.

[tom66]

Re: westinghouse LD-4255VX right side dark

Well tab bonds CAN be fixed but success rate varies... I've had some good for over a year (as has budm) & some fail in a day.

[lookimback]

Re: westinghouse LD-4255VX right side dark

How are they fixed?