Sony XBR-65X850E No Power

[Storyteller12]

Tv won't turn on. Not sure if there is a standby light on this TV but I'm not seeing any.

Checked the usual diodes that go bad and all test good. When plugged in 2 show 100v and the other 2 50v when plugged in.

Below is reading for CN6401

1) 0v - blinking
2) 0v - pwm1 dimmer
3) 0v - DC dimmer
4) 0v - 0wm2 dimmer
5) 3.5v - Standby
6) 0v - pwm3 dimmer
7) 0v - BL On
8) 2.6v BL Error
9) 3.5v PWR On

10-12,19-24) 0v - ground

13-18) 12v all pins - 12v reg

25) 0v - tcon vcc 12v

27-28) .5v - tcon vcc 12v

26) 0v - tcon on

Also I tested backlights with my tester and all pins show 119v. So assuming they're good but not positive since I get 2.6v on bl err pin.

I know a lot of these Sony have bad emmc also but not sure how to confirm if that's my problem.

[lotas]

Re: Sony XBR-65X850E No Power

Check all the fuses, there are a lot of them on the board with the designation "Fxxx", there is a duty LED, turn off the Wi-Fi module, measure the resistance on the HDMI signal lines relative to ground...

[Storyteller12]

Re: Sony XBR-65X850E No Power

I measured all fuses and they test good. I couldn't find the fuse labeled F2800 to measure it. They're so small and really hard to see.


I removed the Wi-Fi card and measured resistance on HDMI and got 5-6 ohm on all 4.

I posted a close up of the fuse I can't find. Maybe someone else will see it and point it out.

[lotas]

Re: Sony XBR-65X850E No Power

But 5-6 Om is a short circuit, this should not be, if this is the case, then only a processor replacement or a motherboard replacement.

[Storyteller12]

Re: Sony XBR-65X850E No Power

Ok, I was leaning towards a bad mainboard but didn’t know how to confirm.

I appreciate your help. Is there anywhere to buy processor?

[lotas]

Re: Sony XBR-65X850E No Power

Here it is better to look for the motherboard, since Sony is linking the processor and eMMC firmware by ID ...

[Storyteller12]

Re: Sony XBR-65X850E No Power

Appreciate the help. I can’t seem to find a main board so I’m sending out for repair to a reputable guy in North Carolina. I’ll post back after I get the board back

[nomoresonys]

Re: Sony XBR-65X850E No Power

Prolly bad e-nand, notorious problem for sonys.

[Storyteller12]

Re: Sony XBR-65X850E No Power

Just got the board back and everything works. It was the emmc that failed as usual.

[nomoresonys]

Re: Sony XBR-65X850E No Power

eMMC Flash combines NAND memory with a built-in controller that handles most of the things you have to take care of when dealing with NAND flash. eMMC is also called managed NAND.