Sony Bravia KDL-46XBR4 screen flashing and colored lines!

[x_orange90_x]

While watching tv yesterday, my screen went black (the backlight was still on). The screen then began flashing on and off with random thick grey vertical bars and a full screen of colored lines. It does this on every channel and input (mind you I can't even see the number) and even the menu. Eventually the tv shut off and the standby light began flashing 5 times and repeats.

I opened up the set to investigate. When I wiggle either end of the LVDS cable nothing changes. If I unplug the cable from the UB1 board, the screen goes completely blank and after a few seconds the tv shuts off and displays the same 5 blink error code. When the cable is plugged in the screen flashes as I said, but the backlight is flashing on and off, not just the image. At one point It just stayed full of the colored lines until I shut It off.

About 6 months ago while repairing the tab bond issue, I accidently shorted the TCON and blew the fuse on It. I replaced the fuse and the set has been working great until now.

My question is, does this sound like the TCON is dying, or something else? Thanks in advance for help!

[x_orange90_x]

Re: Sony Bravia KDL-46XBR4 screen flashing and colored lines!

I must add that no matter what is happening on the screen, there is no distinguishable image, only the lines and blank glow with grey bars.

I found a used TCON on eBay for $25 that the long number printed on the board matches mine exactly including the voltage. Will this then be compatible? Or does the number on the sticker have to match? I don't know what that number is as the seller did not put it in the ad, and I can't read it on the photo.

Also, might be worth mentioning.. Ever since I fixed the far right tab I have had a few color lines near that are that run down the screen. It started off as a thick black line and eventually It broke apart into 6 or 8 1 pixel colored lines. Lately it's been only 2 pixels wide, usually green or yellow in color, and after the tv has been on for an hour or so they almost disappear completely. Does this point at at a TCON issue, or is It likely just the pressure applied on the tab bond?

[x_orange90_x]

Re: Sony Bravia KDL-46XBR4 screen flashing and colored lines!

Ive just completed some more testing. Following the instructions in this post, ive determined my UB-1 board is fine. After a few minutes the screen stayed full of colored vertical lines and through the entire testing my sound remained on. I'm almost certain now its the TCON, so im going to order one from eBay.

Here are a couple videos of what is happening
Rapid flashing then stays solid
Flashes with changing colors

[splitcrete]

Re: Sony Bravia KDL-46XBR4 screen flashing and colored lines!

Pictures of boards . use manage attachments at bottom of scroll.

[x_orange90_x]

Re: Sony Bravia KDL-46XBR4 screen flashing and colored lines!

I put in the new TCON and the tv is working perfectly again! Overall I see no change in color, however It seems more vibrant than before which is a good thing. I think either I got lucky or It was because I choose a replacement with the same exact model number and voltage.

Either way I'm happy it's back to life!