Author Topic: Sony TV KD55X8500G power on issue - schematics? ideas?  (Read 1197 times)

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Offline DTJTopic starter

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Sony TV KD55X8500G power on issue - schematics? ideas?
« on: January 07, 2023, 06:04:01 am »
My 3 year old Sony TV shutdown unexpectedly the other night and now will not power on. The factory reset doesn't work either. It appears completely dead.

I found a service manual for an earlier variant online at https://servlib.com/sony/tv/kd-55x8500a.html?start=0

Being completely dead had me hoping it was just a fuse or similar but I cannot see anything obvious.   :--



Before I started poking around further I wondered is there such thing as schematics available for these things?

If so where will I find them?
Thanks
 

Offline fzabkar

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Offline DTJTopic starter

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Re: Sony TV KD55X8500G power on issue - schematics? ideas?
« Reply #2 on: January 07, 2023, 06:40:28 am »
Excellent. Thanks Frank. No detail schematics but much more information than I had.
Cheers.
 

Offline DTJTopic starter

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Re: Sony TV KD55X8500G power on issue - schematics? ideas?
« Reply #3 on: January 08, 2023, 11:11:11 am »

Follow up for posterity.

The 3V3 stay alive rail was not present.

It had a DDA010 switching supply chip driving a transformer followed by a schottky rectifier.

The SB260 schotty had failed S/C. I replaced it and it now works ok.

 
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Offline bow

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Re: Sony TV KD55X8500G power on issue - schematics? ideas?
« Reply #4 on: November 14, 2024, 08:48:41 am »
Thanks! I found the same issue with my Sony XBR-75X900F. The TV suddenly wouldn’t power up. After replacing the Schottky diode SB260, it’s now working again. I was worried the eMMC might have been damaged from wear after 6ish years.

I also have an SB560 on hand, so if the issue happens again, I’ll try replacing it with that.
 


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