No Power on Panasonic Plasma

[Mikeyboy2007]

I have a Panasonic TXP50X60B which acts as if no power, the person i purchased it from said they plugged a tablet into the USB socket and it shut off the tv and the tablet and neither would come back on, fortunatly he was still under warranty with the tablet. i have plugged it up and no red stby LED from what i can see. i have tested voltages going to mainboard and have attached a picture showing voltages. 2 of those voltages tested jump between .01 of a volt.. im guessing something has went on mainboard but how can i be sure.

[Mikeyboy2007]

Re: No Power on Panasonic Plasma

would probably help to add pictures !! Badcaps wont let me upload using attachment manager..

[Mikeyboy2007]

Re: No Power on Panasonic Plasma

heres the pics....

[newtothis]

Re: No Power on Panasonic Plasma

Sorry missed the bit about the LED.

Voltage across PFC cap?

[Mikeyboy2007]

Re: No Power on Panasonic Plasma

no

[newtothis]

Re: No Power on Panasonic Plasma

Edited previous post...

Voltage across PFC cap? Careful HOT side

[Mikeyboy2007]

Re: No Power on Panasonic Plasma

How can i test voltage across cap ?

[newtothis]

Re: No Power on Panasonic Plasma

DCV 600v on meter. Black to - of main cap and red to + (Cap on its side)

As stated careful, Don't let the probes slip and keep your hands clear

[Mikeyboy2007]

Re: No Power on Panasonic Plasma

Ok will give it a try in the morning and update you.

[newtothis]

Re: No Power on Panasonic Plasma

Also check fuses

[JeffJ]

Re: No Power on Panasonic Plasma

Hm no power at all i was going to ask if he heard the relay click while plugging in but i don't see a relay at all on the PSU. I guess the BR just gets power off the shot on plug in. This looks pretty cheaply built comparative to what i typically see in the Pannys i get in my shop

If you get nothing, newtothis is suggesting the right stuff, start on the hot side see if its ok, IE: blown fuse and go on from there to the secondary.

[tom66]

Re: No Power on Panasonic Plasma

99% bad standby control IC on bottom of board. Cheap part on eBay, SMD soldered. See other threads on this forum.

[Mikeyboy2007]

Re: No Power on Panasonic Plasma

Also check fuses

checked the little white soldered on fuse at side of power in and fuse is fine.

[Mikeyboy2007]

Re: No Power on Panasonic Plasma

99% bad standby control IC on bottom of board. Cheap part on eBay, SMD soldered. See other threads on this forum.

would that be this one thats circled ??

[vinceroger69]

Re: No Power on Panasonic Plasma

i would of thought by what tom has wrote its on the underside of the psu the board you have posted looks like a mainboard too me.

[tom66]

Re: No Power on Panasonic Plasma

Yes, it's on the power board. Have a search on this forum. post re: tw2005 regarding it (Panasonic svc bulletin)

[vinceroger69]

Re: No Power on Panasonic Plasma

https://www.badcaps.net/forum/showth...highlight=U203

[Mikeyboy2007]

Re: No Power on Panasonic Plasma

have purchased U203 and hopefully will solve my problem, will update you guys when replaced.

[Mikeyboy2007]

Re: No Power on Panasonic Plasma

changed U203 and still no power LED or anything ? what else can i try ? is there a way to test U203 ?

[ammarben]

Re: No Power on Panasonic Plasma

control Voltage across pin 6 off U203 if not control the diode sending this vcc