Pansonic TH-42px70 st/by light flashes 10 times

[leonard]

This plasma the st/by light flashes 10
by disconnecting the signal pcb the screen comes on with a whitish picture
i have being checking the output voltages of the power supply while it is working
and found no FVc voltage on pin 8 and 9 of connector p6

Has anyone got a schematic of the psu, the only markings on it are TNPA4221
Thanks

[tw2005]

Re: Pansonic TH-42px70 st/by light flashes 10 times

Try digging through this manual as I suspect it has a TNPA4221. I think there may be some variants, worth a shot.

TH-42PX75U



https://www.badcaps.net/forum/showthread.php?t=25836

http://www.tgohome.com/ServiceManuals

[leonard]

Re: Pansonic TH-42px70 st/by light flashes 10 times

Thanks, very similar to my circuit
The power supply is ok
There is a problem with the main pcb
I am looking at all the regulators on the main pcb
The sos tp is at around 1v which means there is a problem somewhere
what I think is happening is that the regulators are under the control of a microprocessor, and these are not being switched on,
I will have to go thru all of the protection circuitry
I will post more when i get to the cause