Interpreting Service Manual Troubleshooting Steps

[michalk3777@gmail.com]

Hello
I'm troubleshooting a dead Sony XBR-65X810C.
I was able to find a service manual from one of the posts here.
I was able to get through the steps highlighted in yellow, but need some help with next steps. See attached Picture.
Next step says:
Check OPWRSB
R9179 Voltage.
Is the voltage 0V?

and one after says:
Check STBY_MHL
R9176 Voltage.
Is the voltage >3.0V?

These are referring to the same resistor, what does OPWRSB and STBY_MHL stand for?
I measured voltage on both ends of that resistor and got 0V (millivolts).

[R_J]

Re: Interpreting Service Manual Troubleshooting Steps

So you have 3 volts on R9186?

[michalk3777@gmail.com]

Re: Interpreting Service Manual Troubleshooting Steps

Yes 3.48v

[R_J]

Re: Interpreting Service Manual Troubleshooting Steps

I don't know what "OPWRSB" stands for. It seems to refer to a control pin on a microprocessor in other manuals., without a schematic, it will be hard to trace the circuit, R9179 & R9176 don't seem to be the same resistor.
If the voltage on R9179 IS 0 volts, then proceed to the YES and check Power_ON

[dick_barton]

Re: Interpreting Service Manual Troubleshooting Steps

You can find some information in this pdf
OPWRSB - Power In On/OFF

[michalk3777@gmail.com]

Re: Interpreting Service Manual Troubleshooting Steps

Thank you RJ, my bad, I read both Resistors as the same number, I actually checked R9176 and got 0V.
So next step says:

Check POWER_ON
P-on ucom #pin19
Is the voltage >3.0V?

I'm not sure about this again, as there is no pin#19 on any of the boards that is named POWER_ON. I checked POWER_ON pin on the main board which is Pin#22 and Pin#9 on the Power board, they both have 3.5V.

So that takes me to the next step:
Check P_ON_LNB
P-on ucom #pin15
Is the voltage >3.0V?

Again there is no Pin#15 on any boards that are called P-ON_LNB.
But I searched the Service Manual for P-ON_LNB anywhere else and its on another troubleshooting tree referencing R9167.
"Check P_ON_LNB signal line
at R9167 = 3.3V?"
So I checked R9167 and has 0V on both ends. So that would point to > Change IC9017.

Any idea if I'm interpreting this correctly?
If IC9017 is suspect, would you suggest I try to heat it up enough to re-flow the solder? Or I should be able to find a replacement.?

Thank you for your help getting me this far.
Cheers

[dick_barton]

Re: Interpreting Service Manual Troubleshooting Steps

Looks like that chip is a 20 pin, 8bit flash microcontroller made by Microchip
https://cdn.badcaps-static.com/pdfs/...07d0b1414e.pdf
and if it is then it most probably programmed by Sony

It may well be that it supervises the power on sequence.
Check it has its supply voltage on pin 1 (VDD)

[R_J]

Re: Interpreting Service Manual Troubleshooting Steps

I believe these boards have a few smd fuses that would be worth checking, like F9005 (in the picture) I believe this fuse is next to the letters IC in IC9004

I also see on shopjimmys site that these boards require a software update after replacing, so it is possible there is a software issue with the board.

[michalk3777@gmail.com]

Re: Interpreting Service Manual Troubleshooting Steps

Sorry for the delay, I don't have much time to work on this.
THank you for your inputs.
I found maybe 7 or 8 fuses on the main board, all of them had either 12 or 5V on both sides of each fuse. So they are all good.
I also checked pin1 of IC9017 and it has 3.5V.
As far as software goes. When I plug a usb stick and plug the TV in it does not even light up, so its not reading anything.
Any other ideas I could try?

These boards are expensive and out of stock everywhere.
I found a place in Tuscon, AZ (Nicks TV Repair) who repairs these boards, for $185 +shipping.
This looks like the best option I found.

[michalk3777@gmail.com]

Re: Interpreting Service Manual Troubleshooting Steps

BTW the board No. is A2072598B

[R_J]

Re: Interpreting Service Manual Troubleshooting Steps

Have you tried a forced reboot?

At the start, unplug your SONY XBR-65X810C from the power source and wait for about 2 minutes. Now press and hold the Power button and Volume - button together on your SONY XBR-65X810C TV. Then plug the TV back into the power source. Wait until the LED light turns green, then release both buttons.

[michalk3777@gmail.com]

Re: Interpreting Service Manual Troubleshooting Steps

I think I have tried this reboot, but may have not followed exactly as you said. So will try again and let you know.
Now currently I don't get any LEDs to come on at all.
thank you

[michalk3777@gmail.com]

Re: Interpreting Service Manual Troubleshooting Steps

Plugged in with both buttons pressed and held for 2 minutes. No lights came on.

[Davi.p]

Re: Interpreting Service Manual Troubleshooting Steps

Let's start from the begin, don't read service manuals for now, have you got time to repair this? Does tv makes any sign of life? If not detach the power board and test it at bench by forcing it on and better putting dummy loads.

[michalk3777@gmail.com]

Re: Interpreting Service Manual Troubleshooting Steps

Hello Davi,
thank you for trying to help me out.
I'm good to start from the beginning.
I was not available for a while but I now have 2 weeks where I can work on this, and hope to get this fixed.

So I disconnected everything from the power board and got the following results.
Testing GL6 Power board
Main board connector disconnected
3.5 STDBY only
Main board connector connected
Pins:
AC_OFF_DET: 3.5V
POWER_ON: 3.5V
REG12V: 12.7V present
Pins: STDBY and Tcon_ON shorted
TCon_VCC12V: 12.7V

Backlights connector
Pins:
+OUT1: 98.6V
-OUT1: 0V
Pins: STDBY and BL ON shorted
Pins:
+OUT1: 220V
-OUT1: 80V
No Backlights ON

Not sure how to stimulate loads.
THanks again, hope you can still help.

[michalk3777@gmail.com]

Re: Interpreting Service Manual Troubleshooting Steps

This indicates to me that Power board is OK, I'm just not sure about the Backlight outputs.

[budm]

Re: Interpreting Service Manual Troubleshooting Steps

Pins: STDBY and BL ON shorted
Pins:
+OUT1: 220V
-OUT1: 80V
No Backlights ON

That should be around 20V range, 80V is way too high.
Is that measured with ref. to circuit ground?

[michalk3777@gmail.com]

Re: Interpreting Service Manual Troubleshooting Steps

Thanks for your response.

Yes ref. is ground.
Would simulating some load help in troubleshooting the BL circuit?

I just picked up an XBR55800G for free that powers up but has a broken screen.
the main board is different but the power board looks identical, GL6 board,
I;'ll check the numbers tomorrow when I open it up.

[budm]

Re: Interpreting Service Manual Troubleshooting Steps

Can I see the pictures of the whole backside of the TV showing all the boards so I can see what we are dealing with?

[michalk3777@gmail.com]

Re: Interpreting Service Manual Troubleshooting Steps

Hello
Pictures attached