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Old 01-22-2018, 01:41 AM   #54
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Join Date: Oct 2012
City & State: Folsom, CA
My Country: USA
Line Voltage: 120vac 60hz
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Posts: 3,720
Default Re: Sony XBR75X850C no picture backlights on

Ok I backfed a 16v line into AVDD from another tcon. Found that the AVDD runs into CS29 here. Also ICD3 and ICD4 ARE receiving 12v also normally along with 5V on VCC.

I also noticed 16v at CG8 of ICD3. Because I'm backfeeding the 16v at AVDD from other tcon..

ICD4 thou, seems unaffected as i believe that IC drives VOFF and others it seems.

Still no voltage at HAVDD. This would be at point DSB1.. DSA1 is alive with the 16v from the feed off the other tcon.

Now in pretty sure that IF I was able to plug all the missing voltages as long as I knew the correct voltages for the panel operation, to the tcon, I bet I would have a perfect picture.

This is a major hack though, I'd like to know why I've managed to try 4 different tcons now all with the same result. Like I said earlier, I supplied 10v to AVDD and saw a jumpy misconstrued picture with the Sony menu screen and avaliable inputs.

So this leaves me to trying to determine exactly why the regulators are not switching on.
Attached Images
File Type: jpg 20180121_233511.jpg (1.13 MB, 19 views)
File Type: jpg 20180121_233546.jpg (754.3 KB, 16 views)
Did I leave the soldering iron on?

Last edited by freakaftr8; 01-22-2018 at 02:09 AM..
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