Sony TV Model XBR-55XB810C (Assistance Required Please)

[jrcobo]

Hi
I have a problem with the Sony TV Model XBR-55XB810C (not sound, not stand by light, black screen)
1-980-310-11 power board, Q6802 (K8A50D, Mosfet N)=0.0v
Tcon_Vcc_12v=0.0v
In the Connector CN6401, the values are similar.
In the Connector CN6801 (+LED = 90.30v and -LED = 0.0v)
I need help about it, and I want to know where to find the datasheet of the power, main and T-con boards
Thanks

[dick_barton]

Re: Sony TV Model XBR-55XB810C (Assistance Required Please)

Have you read through the following thread
https://www.badcaps.net/forum/showth...&highlight=GL6
MK3777 has made an excel file showing voltages which you could compare against.
What is the backlight error voltage

[zen]

Re: Sony TV Model XBR-55XB810C (Assistance Required Please)

Hi

If i understand correctly , the T-CON 12 V , plus the back light supplies are missing .

If you cannot find any obvious shorts , i would be inclined to removed power board from set , then drive it in a stand alone mode .

There seems to be a voltage table printed onto board , just above one of the connectors .

Your looking for PS-ON , to release the LT switch supplies & BL-ON to release the back light supplies .

Depending on design of circuitry , you will either need to apply a small voltage , under
5 V , or take line to G N D , as to trigger the switched supplies .

Regards Xen

[dick_barton]

Re: Sony TV Model XBR-55XB810C (Assistance Required Please)

From this thread which you have already added to, it appears to say that the BL_ERR should be 0V else you have a backlight problem.

https://www.badcaps.net/forum/showthread.php?t=74206

[Nick's Tvs]

Re: Sony TV Model XBR-55XB810C (Assistance Required Please)

Dead no power = main board failure 99% of the time. Sometimes force updating the set using Sony's software fixes it, sometimes not.

Software download link:
https://www.sony.com/electronics/sup...loads/00016747

Video showing how to force the update/pairing:
https://youtu.be/3kYPjIHt8Lc?t=319

But either way if this works or not, this is a main board failure.

[Davi.p]

Re: Sony TV Model XBR-55XB810C (Assistance Required Please)

Dead no power = main board failure 99% of the time.

Sorry, i don't agree, my bet over than 50% are Power board problems.
To the OP: please don't use Assistance required in title, that statement is not useful, better to shortly describe tv symptom or problem.
Post CN6401 readings with near their labels. Bye.