Sony XBR-65X810C Not Powering on

[WeadroW]

Re: Sony XBR-65X810C Not Powering on

Thank you freakaftr8 and nomotesonys for the guidance thus far, Got around to trying to get the backlights on. I tried dc_dimmer and pwn_dimmer separately with bl_on all to 3.3v standby with no luck. I also tried all 3 together and nothing happened. I did want to report that at connector cn6801, on the pin +out1 I get 92v and no other voltage on any other pin. (Under regular plug in conditions) This connector looks to goto the backlights. When I had the jumpers connected I did not see the voltage. Anyone know if this power supply can force the backlights on for testing? Any other troubleshooting to confirm the issue is mainboard? I find it odd that I’m not getting any error codes from the indicator. Thanks!

[nomoresonys]

Re: Sony XBR-65X810C Not Powering on

http://www.shopjimmy.com/sony-1-474-...wer-supply.htm pic. of powersupply, if correct.

[nomoresonys]

Re: Sony XBR-65X810C Not Powering on

Did you try unplug powersupply from everything EXCEPT mainboard, so the powersupply is only connected to mainboard and measure voltages on connector again see if anything changes.

[nomoresonys]

Re: Sony XBR-65X810C Not Powering on

Could try testing connector harness for continuity of all the wires to make sure there's no break in any wire, CAREFUL not to spread the connector ends.

[nomoresonys]

Re: Sony XBR-65X810C Not Powering on

Could try tracing the wire from bl_on pin number 3 back to mainboard, unplug connector and test that pin, see if it's 3.3 or so, I'm thinking it won't be because it's missing on powersupply side.

[WeadroW]

Re: Sony XBR-65X810C Not Powering on

I checked the harness to mainboard for continuity and it check out. On the backlight connector, should I be getting continuity between the black and red wire going to the backlights? It is open. (See photo of connector) Also, I measured voltage on cn6801 (backlight connector) unplugged and plugged in, and I got the same voltages, around 92v. Still presuming mainboard issue but not confident I can't get any results from the backlight tests.

[budwich]

Re: Sony XBR-65X810C Not Powering on

the resulting voltage test appears to indicate an open further down from the connector along the red and black wiring since it makes no difference plugged in or not. Are you able to readily trace that wiring towards the "lights"?

[WeadroW]

Re: Sony XBR-65X810C Not Powering on

Should voltage be increasing when powering on? So then red/black wire should not be open circuit? I can take the panel apart and test LEDs/trace short if needed.

[budwich]

Re: Sony XBR-65X810C Not Powering on

I think that you will find most systems show a higher voltage (no load) when nothing is connected and then reduce in voltage to "normal operating range" when connected. Regardless, no difference between "plugged" and "unplugged" indicates that the wiring on the other end of the plug is basically "not there" (ie. open) in terms of what the circuit / supply is "seeing". Your resistance measurement kind of confirms this. Good chance that if you can see where the wire ends are... that end has an issue as opposed to say a led gone in the panel.... and might be an easier fix.... if you are lucky.

[WeadroW]

Re: Sony XBR-65X810C Not Powering on

Well I ran into a little bit of a set back. I was rechecking some of the power supply voltages and now I’m not getting any of the reg12v voltage or the bl_err 2.3v. I’m only getting the standby 3.3v. I’m also not getting the 92v voltage that was going to the backlight connector. Set will not attempt to power on any longer either. So I’m going to have to troubleshoot the power board now because up to this point all these voltages were present. Any suggestions on where to start with this Sony power supply? I’ll be working on it later tonight.

[nomoresonys]

Re: Sony XBR-65X810C Not Powering on

https://www.youtube.com/watch?v=mUvclBfaMXg

[WeadroW]

Re: Sony XBR-65X810C Not Powering on

Well I was able to at least jump power_on to the 3.3v and get my voltages back. Still nothing with the tconn voltages. I was able to jump the bl_on to the 3.3v and on the pin +out I was getting 220v, and the return -out I was getting 76v with connector plugged in. (Backlights) when the connector was unplugged I got 220v on +out and nothing on -out. Backlights did not light up either. I did have both dc_dimmer and pwm_dimmer jumped to 3.3v as well during this test. Mainboard was unplugged. Does the voltage drop across the +and - of the backlight connector make sense? I guess I need to tear the set down to the backlights to get to these connectors and test them.

[budm]

Re: Sony XBR-65X810C Not Powering on

Well I was able to at least jump power_on to the 3.3v and get my voltages back. Still nothing with the tconn voltages. I was able to jump the bl_on to the 3.3v and on the pin +out I was getting 220v, and the return -out I was getting 76v with connector plugged in. (Backlights) when the connector was unplugged I got 220v on +out and nothing on -out. Backlights did not light up either. I did have both dc_dimmer and pwm_dimmer jumped to 3.3v as well during this test. Mainboard was unplugged. Does the voltage drop across the +and - of the backlight connector make sense? I guess I need to tear the set down to the backlights to get to these connectors and test them.

1) There will be no T-CON Voltage until you force on T-CON on pin (I use resistor).

2) Getting 76V on the -Out1 (which is the Cathode return for the LED) that goes to GND VIA PWM Controlled MOSFET and the current sensing resistors (R6829 ~ 33 connected in parallel), it looks like the MOSFET Q6802 is not being controlled or bad current sensing resistors so the Voltage on the +Out1 went up to over 200V. IC6801 is the LED CONTROLLER IC. Can you read the P/N of that IC?

3) I never try to jump the control pins directly to the STBY power supply without the resistors because if you jump it ti the wrong pin you can damage the circuit, I always use resistor for that reason.
BTW, so does your board an exact matched to the one at Shopjimmy? Sony 1-474-633-11 (APS-395(CH)) GL6

[nomoresonys]

Re: Sony XBR-65X810C Not Powering on

https://electronicshelponline.blogsp...er-supply.html example using 10k resistor.

[WeadroW]

Re: Sony XBR-65X810C Not Powering on

“BTW, so does your board an exact matched to the one at Shopjimmy? Sony 1-474-633-11 (APS-395(CH)) GL6”
Yes, the board looks to be exactly the same as the shop jimmy one you are referring to. I have attached a pic of my board. I will have to run the other Tests you described later and will report back.

[WeadroW]

Re: Sony XBR-65X810C Not Powering on

1) There will be no T-CON Voltage until you force on T-CON on pin (I use resistor).

2) Getting 76V on the -Out1 (which is the Cathode return for the LED) that goes to GND VIA PWM Controlled MOSFET and the current sensing resistors (R6829 ~ 33 connected in parallel), it looks like the MOSFET Q6802 is not being controlled or bad current sensing resistors so the Voltage on the +Out1 went up to over 200V. IC6801 is the LED CONTROLLER IC. Can you read the P/N of that IC?

3) I never try to jump the control pins directly to the STBY power supply without the resistors because if you jump it ti the wrong pin you can damage the circuit, I always use resistor for that reason.
BTW, so does your board an exact matched to the one at Shopjimmy? Sony 1-474-633-11 (APS-395(CH)) GL6

Budm,
Info for 2)
I do not see any resistors in the range of R6839 to R6833? Is this on the back of the board?
MOSFET Q6802, I measured a few diode checks in circuit and seemed to check out ok.

I do not see IC6801, I have IC6301 and the p/n is MIP2H2 and below that is 520S2C. This is the only IC I see on the power supply. Pictures attached

[budm]

Re: Sony XBR-65X810C Not Powering on

Those SMD Resistors are on the botttom side of the board, one end of each resistor is connected to the Source pin of the MOSFET, the other end of each resistor is connected to the circuit GND.
The IC is also on the bottom side of the board.
There are many parts on the bottom side of the board that you must have seen since you are able to check the MOSFET.

[WeadroW]

Re: Sony XBR-65X810C Not Powering on

Apparently I was being lazy and didn't want to take the board out of the tv...
On those resistors I'm getting 1.2 ohms across each one. What resistance should these be putting out? Should I take these out of circuit to test? I have a picture of the IC you requested, the P/N is A3854AM and under that is 519A22A. I can report the mosfet readings, but I'm not sure which pin is gate, source, drain.

[budm]

Re: Sony XBR-65X810C Not Powering on

Apparently I was being lazy and didn’t want to take the board out of the tv...
On those resistors I’m getting 1.2 ohms across each one. What resistance should these be putting out? Should I take these out of circuit to test? I have a picture of the IC you requested, the P/N is A3854AM and under that is 519A22A. I can report the mosfet readings, but I’m not sure which pin is gate, source, drain.

OK, the resistors are fine, if they are bad they will show in hundreds of Ohms.
I will have to look for the spec sheet of that LED controller SONY IC A3854AM to see how it operates.

[WeadroW]

Re: Sony XBR-65X810C Not Powering on

I took the set apart all the way down to the backlights. I tested each light individually and they all light up. I checked 4 at a time with 12v which looked good. It looks like there are some diodes on the LED string and I test these and one is OL both ways. I might have caused this when I tested 12v across it. That area is lighting dimmer then the others that test good. Any ideas on replacement? I have a photo of the diode and the dim-ness of the led string in question. Also a pic of the entire backlight assembly.
I also used a 1k resistor to jump bl_on and checked voltage. I got 220v on the +out again but no voltage on -out. That was checking from chassis ground and also across +out and -out.
Is this an LED string issue or the control IC 6801 issue? I still have not been able to get the backlights on with the powersupply.