LC-52D85U Flashing (Power/OPC) (Power/OPC) (Power)

[Plurxtc1]

I have a Sharp that shows up no picture/audio. The power stays solid for like a minute then it relay restarts until after 3 restarts it will flash both (Power/OPC) (Power/OPC) then (OPC) before restarting the same sequence. It's dark on my work bench right now so I'm using the shopjimmy reference picture. I can have my own picture when its day light.

I took a snipet of the schematics from the service manual for the socket PD
My measurements
1. UR13V = 13V
2. UR13V = 13V
3. UR13V = 13V
4. GND
5. GND
6. GND
7. GND
8. AC_DET = 3V
9. PS_ON = 3V
10. PNL_ON = 0V
11. GND
12. BU5V = 5V

Bottom right of the picture
LA
INV12V = 12V
SGND3 = GND
INV60V = 60V

I couldn't attach a service manual so i left the link here.


I placed a snipet of the error codes because I'm slightly confused because the codes blink together instead of separate.

[R_J]

Re: LC-52D85U Flashing (Power/OPC) (Power/OPC) (Power)

Did you look at the other threads on this model? Like this one: https://www.badcaps.net/forum/showth...ight=LC-52D85U
It could be an inverter or ccfl problem

[Plurxtc1]

Re: LC-52D85U Flashing (Power/OPC) (Power/OPC) (Power)

I did, I check the inverters for the transformers. All the transformers showed 1.3K Ohms. None of them were short.

[neilc6]

Re: LC-52D85U Flashing (Power/OPC) (Power/OPC) (Power)

You need to count the flashes separately.

https://www.badcaps.net/forum/showthread.php?t=66691

1 power flash is lamp error.

[R_J]

Re: LC-52D85U Flashing (Power/OPC) (Power/OPC) (Power)

I checked the service manual and for "power led 2 flash and opc 3 flash is:
DET_5V (33pin on microprocessor) error (L). D5V or A5V is not applied.
If error is detected during operation, error standby is activated by
polling.

Check the main board regulators, (page 81 of manual) You could be loosing 5V from ic9602

[Plurxtc1]

Re: LC-52D85U Flashing (Power/OPC) (Power/OPC) (Power)

This 4 pin socket goes to the T-CON 12V pins and 2 GND pins. The 12V pins are only showing up 0.5V for both even with connector disconnected at the T-Con. Would this be an issue with the power supply? This is while the TV is already booted where the adjacent socket is showing the correct voltages.

[R_J]

Re: LC-52D85U Flashing (Power/OPC) (Power/OPC) (Power)

The PNL12V is controled by the PNL_POW line, 0v = no PNL12V

[Plurxtc1]

Re: LC-52D85U Flashing (Power/OPC) (Power/OPC) (Power)

Could it be I'm having a problem with this voltage regulator? PQ30RV31 at location IC7121? Pin 2 goes to the connector PL which has PNL12. I'm getting an input of 12V going to Pin 1 for the IC. But only .5V at Pin 2. Pin 3 is GND and Pin 4 i'm only get 4V.

[R_J]

Re: LC-52D85U Flashing (Power/OPC) (Power/OPC) (Power)

.