Sony Bravia KDL-37v5810 colour fault - is this an AS15 TCON problem?

[woppermite]

Summary of question:
Is this colour fault an AS15 failure that could be fixed by sending off TCON board to an ebay repairer to replace the AS15? Any recommendations for repairers in UK to do this job (assuming that doesn't breach forum etiquette)? Can't find a TCON board for less than £120 which seems uneconomic for a speculative repair.

Skill level: software developer with some knowledge of computer video. Very little confidence or experience with electronics hardware but very happy to learn more. Some dummy level pointers on safe disassembly, static protection for replacing a TCON board would be very welcome.

My Bravia KDL-37v5810 has worked well with pretty good colour accuracy (IMO) for 6 years from new but colours have suddenly gone wrong. Image stability, geometry and rest of TV functionality are all fine. Have tried factory reset, leaving TV unplugged for 24 hours. Firmware is up to date but TV won't let me reinstall firmware as it's up to date. Service status screen shows 10K panel hours. Some non-zero values are listed under DTT_WD - some posts on the net list this as software or firmware error.

Have attached test images taken with same camera on working laptop and same display mirrored on TV HDMI connection. Have turned off most of the image 'enhancement' TV features. Original images are from https://en.wikipedia.org/wiki/List_o...d_RGB_palettes. Input from TV tuner or other sources shows errors that are similar in character.

Judging from gradient images, there's a similar error in the gamma curve for each component but in a slightly different place for each component so the greyscale gradients show colours.

From what I've read online this looks like a classic AS15 chip failure. Does the AS15 work on each individual component independently in RGB colour space, or YCbCr or is it more complicated than that?

However similar colour errors also appear on the TV overlays and internal help system. Some posts I've read suggest that this may mean it's a main board failure. Is that correct? Doesn't appear to be a panel failure from what I've read.

Thanks for reading!

[diif]

Re: Sony Bravia KDL-37v5810 colour fault - is this an AS15 TCON problem?

If the t-con has the AS15 chip and has colour issues, it's the first thing I replace.
Takes me longer to take the back off the TV than it does replace them now.
If you want to be sure you can measure the voltages on the test points.

[dick_barton]

Re: Sony Bravia KDL-37v5810 colour fault - is this an AS15 TCON problem?

I'd agree with diff that it does look like a tcon problem and a chip change would hopefully fix it.

[noledud]

Re: Sony Bravia KDL-37v5810 colour fault - is this an AS15 TCON problem?

looks like an AS15 fault to me, I just search ebay for TCON repair - I have used louise.cole19862012 on a few occasions, always been spot on.

[petehall347]

Re: Sony Bravia KDL-37v5810 colour fault - is this an AS15 TCON problem?

got mine from tekkikid on that ebay ... good chip .