SONY XBR-65X850A Won’t turn on

[budm]

Re: SONY XBR-65X850A Won't turn on

https://www.badcaps.net/forum/attach...5&d=1582213154
According to the chart, you will report in this format (Notes that the connector CN6401 has Even pin column and Odd column pin. Even column pins you can probe from the top side of the board, the Even number pins you will have to probe from the bottom side or use skinny probe on the wire entrance side).
When TV is Off:
Pin 1 NC = No connection
Pin 2 DIGITAL_STBY = ??? V
Pin 3 BL_ERR = ???? V
Pin 4 ......

When TV is turned on:
Pin 1 NC = No connection
Pin 2 DIGITAL_STBY = ??? V
Pin 3 BL_ERR = ???? V
Pin 4 ......

[Slavabusy]

Re: SONY XBR-65X850A Won't turn on

No any dc voltages outputs from power boards. Instead, some pins showing around 3v A/C.
In order left to right:
Plug cn6601 all zero volts
Plug cn6602 all zeros
Plug cn6402 all pins except #1 measured 3vac, #1-zero volts

Plug cn6401 (from top to bottom)
Pin #2 measured 3vac, all other pins 0 volts

Input voltage is 120vac at both of the power boards, fuses are good.

Any ideas appreciated!

Please DISREGARD this post, my mistake.

[Slavabusy]

Re: SONY XBR-65X850A Won't turn on

Board G6, connector CN7401:
Pin 25 STBY3.3v = 3.4vdc
Pin 27 AC_OFF_DET = 3.4vdc
Also I checked STBY FB (top left corner of board) 3.3vdc on D6201 Cathode (white mark on diode)
3.4vdc is present at the Cathode of D6201.

No other pins of any other power boards connectors showing voltage.
Will take pictures of the back of the power boards tomorrow.
Thank you all guys for participating it this repair thread!

[R_J]

Re: SONY XBR-65X850A Won't turn on

The power supply will not show other voltages untill it sees the PS_ON signal from the main board. Check this pin and press the power button, does this voltage change? if not I suspect the fault is on the main board.

[Slavabusy]

Re: SONY XBR-65X850A Won't turn on

Thank you! Will do in the evening!

[budwich]

Re: SONY XBR-65X850A Won't turn on

You are likely doing your measurements "too late". You need to monitor the voltage on a pin when you attempt to turn the set on as the system shuts things down pretty fast IF it detects a problem. Further, you didn't follow the "good advice" provided in post 21 that you had asked for.... :-( Following this advice will give that forum a better feeling that you measuring "work" is being done correctly.

[Slavabusy]

Re: SONY XBR-65X850A Won't turn on

That is correct! I didn’t even try to turn it on, because it doesn’t turn on..

[budm]

Re: SONY XBR-65X850A Won't turn on

the power supply will not show other voltages untill it sees the ps_on signal from the main board. Check this pin and press the power button, does this voltage change? If not i suspect the fault is on the main board.

+10

[R_J]

Re: SONY XBR-65X850A Won't turn on

You can test the power supply by disconnecting the plug on CN6401 that goes to the main board. Then use a (about) a 1k resistor, and connect it between STBY3.3V and POWER_ON
(or between D6201 Cathode [white mark end] and JW6134 (next to cn6401)
This shouldl turn on the REG12V.

[pier12]

Re: SONY XBR-65X850A Won't turn on

Look at page 105 in this service manual

[Slavabusy]

Re: SONY XBR-65X850A Won't turn on

You guys are awesome! Thank you all! Sorry, didn’t have a chance to test any yet, but I will do soon!

[Slavabusy]

Re: SONY XBR-65X850A Won't turn on

When I press power button
Pin 28 (POWER_ON) voltage doesn’t change, 0v
I didn’t have a 1kOhm resistor to kick on the power boards.
Pier12, this is nice repair manual, but not sure if it covers 100% of the model I have because I couldn’t find JL9129 or any JLs on the main board.
But, I ordered main board from tvpartstoday.
Hopefully, it’s gonna make it!
Fingers crossed..

[R_J]

Re: SONY XBR-65X850A Won't turn on

The resistor does'nt need to be a 1k, usually between 470Ω to 2~3k should work. But since you don't have the POWER_ON signal from the main board, that is more likely the issue. If it was a fault on the power supply (and you have standby voltage to the main) you should see the POWER_ON go from 0 to 3 volts when you push the power button.

[Slavabusy]

Re: SONY XBR-65X850A Won't turn on

Thanks.

[Slavabusy]

Re: SONY XBR-65X850A Won't turn on

Finally, I have some progress.
First replacement main board didn't do anything, but they were nice and sent me another one.
Now, tv turns on and I can see the menu and navigate there.
However, it doesn't go online for any apps, or updates.
Status is showing connected, ip, and all that.
Both boards they sent me are used, I think.

[Slavabusy]

Re: SONY XBR-65X850A Won't turn on

Using wired connection directly from my router