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Old 01-22-2018, 10:14 AM   #55
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Davi.p's Avatar
Join Date: Sep 2009
City & State: Milan
My Country: Italy
Line Voltage: 230Vac 50Hz
I'm a: Hobbyist Tech
Posts: 1,483
Default Re: Sony XBR75X850C no picture backlights on

Hey wait a moment! From the last picture i see the burnt mark on ICB1, is that mark made by your shorting sparks? Almost surely them are single mosfets even if them are called "IC" but the burnt is between gate and drain! Not good...
Also ICD3 and ICD4 ARE receiving 12v also normally along with 5V on VCC.
You don't know if that 5v is VCC or not, it can be a VREF, an internal LDO...
Like I said earlier, I supplied 10v to AVDD and saw a jumpy misconstrued picture with the Sony menu screen and avaliable inputs.
Where is this screen? You don't have taken picture...
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