Sony Bravia KDL-46WL135 White Display

[1997eclipsegst]

Hey everyone!
I recently purchased a non working Sony KDL-46WL135 that displays a white screen when turned on. Whenever I press the channel buttons the screen will fade to black then return to the white screen. I read that a T-Con could possibly cause this to happen. I purchased a replacement T-Con with the same part number but get the same results with either one. There is a secondary board that attaches to the T-Con where the ribbon cable and power is supplied. The secondary board from what I read is called a UB2 board. I have tested power to the UB2 board and is receiving the correct 12v and 6v from the power supply.Could this cause the issue or do I have a faulty panel? Thanks in advance!

T-Con board # 404652FIX2HC6LV1.2
UB2 board # A1519918A

[gilly1984]

Re: Sony Bravia KDL-46WL135 White Display

Could also be a faulty main board.

Any pics of the internals?

[gilly1984]

Re: Sony Bravia KDL-46WL135 White Display

I doubt this will do anything but have you tried entering the service menu to reset it?

With TV switched on, left,right,mute,center button,mute,menu

It could be another button combination, thats just the result of a quick google search.

Worth a try til one of the experts pipe in

[1997eclipsegst]

Re: Sony Bravia KDL-46WL135 White Display

Is there any way to test the main board?

Internal pics

[gilly1984]

Re: Sony Bravia KDL-46WL135 White Display

Can you post with the manage attachments feature.

And some nice clear close ups of the power board and mainboard.

[1997eclipsegst]

Re: Sony Bravia KDL-46WL135 White Display

I will disassemble it some more and remove the cover on the other half of the main board to get some better pics. I will post them up here in a little bit. I tried the service menu sequence you posted and it just turned the right hand 1/3 of the screen black but didn't display anything.

[gilly1984]

Re: Sony Bravia KDL-46WL135 White Display

http://www.avsforum.com/t/1087046/so...0-service-menu

Maybe you could navigate your way down to the reset?

Dont try it yet though, unless Tom66 agrees.

[1997eclipsegst]

Re: Sony Bravia KDL-46WL135 White Display

Some better pictures of the components

[1997eclipsegst]

Re: Sony Bravia KDL-46WL135 White Display

I hooked up cable to the tv tonight. It has sound and changes channels fine. The display shows multicolored lines and changes with the scene of the program. The heatsink on the UB2 board that is directly below the T-Con is quite warm only after running for 5 mins. Any thoughts?

[1997eclipsegst]

Re: Sony Bravia KDL-46WL135 White Display

Another quick update. After running for 15 mins. it has a picture now. The picture looks a little dim in the center, and the right 2/3rd's of the screen looks a little distorted compared to the left 1/3 of the screen. It's kind of hard to see in the pictures.

[tom66]

Re: Sony Bravia KDL-46WL135 White Display

Looks a lot like bad tab bonds to me...

[1997eclipsegst]

Re: Sony Bravia KDL-46WL135 White Display

Well that stinks. I am going to let the tv cool down, fire it back up and see if it has all the lines like it did when I first tuned it on. Do you think I could take a heat gun and warm up the tab bonds when the tv is cold to see if I get a picture right away instead of everything warming up to rule out any defective boards?

[MisterD]

Re: Sony Bravia KDL-46WL135 White Display

It could be bad tab bonds on the LCD panel, I would take a hair dryer and heat the area where the ribbon cables go into the panel from the T-CON going along the entire top of the panel, and you can try carefully twisting the panel a little with the back removed. check out my thread here:

https://www.badcaps.net/forum/showth...hlight=element

[1997eclipsegst]

Re: Sony Bravia KDL-46WL135 White Display

Thanks for the replies everyone. I just turned it back on and the picture was working, then just barely twisted the panel and the picture froze and all the lines came back. Twisted the panel the other way and the picture came back. Definitely bad tab bonds. Time to tear it apart.