Panasonic tc-p42u2 psu or main issue

[microvibe]

I have a 42u2 with 10blinks replaced sc and ss. Buffers tested good. Removed cables still 10 blinks . Took voltage readings with TV plugged in and during power up.

Connector P6 plugged in

Pin 1 0v pin 2 0v pin3 0v pin4 0v pin 5 0v pin6 0v
Pin7 15.73v pin8 15.73v pin9 15.73 pin10 0v pin11 0v

Connector p6 plugged power turned on same readings as above

Connector p7 plugged in

Pin1 4.96v pin2 0v pin3 0v pin4 0v pin5 0v pin6 3.27v
Pin7 0v pin8 0v pin9 0v

Connector p7 plugged in turned on
Pin 5 changes from 0v to 3.27v pin6 changes from 3.27v to 0v all other pins no change.

SC ss vda connectors have no voltage present.

If it's main I would like to try repairing.

[ReeceyBurger123]

Re: Panasonic tc-p42u2 psu or main issue

Have you tested the SC and SS boards input connectors for shorts to ground first .

[microvibe]

Re: Panasonic tc-p42u2 psu or main issue

I have and I have also powered on with them disconnected stays 10 blinks.

[ReeceyBurger123]

Re: Panasonic tc-p42u2 psu or main issue

So vsus and Vda are just dead totally dont even come up at all ?

[microvibe]

Re: Panasonic tc-p42u2 psu or main issue

Nothing at all hit power relay cl8cks then clicks again 10 blinks

[tw2005]

Re: Panasonic tc-p42u2 psu or main issue

Just going through some of my historical threads and I have had 10 blink from a damaged / shorted SD card slot and an A-board. Also known as kids or somone inserted an bject in there and bending the contacts.

Worth checking, may be slim chance but I was very surprised when I decided to check it out.

[microvibe]

Re: Panasonic tc-p42u2 psu or main issue

Is there a way to disconnect a board and force power supply on to rule out psu.

[Andrew F. Ali]

Re: Panasonic tc-p42u2 psu or main issue

Yes there is away to 'self test' the PSU. Disconnect all connectors from the PSU bd. P2 P6, P7 and etc.
Connect two (2) 120Vac light bulbs in series. Then connect a 1k resistor across P7-pin1 labeled STBY5V and pin5 labeled F_STBY_ON.
Connect another 1k resistor across P7-pin1 labeled STBY5V and pin7 labeled PANEL_MAIN_ON. Take the light bulbs previously connected in series and connect that across P2-V-sus voltage. Connect 120vac to the PSU. If the PSU is good the 120Vac light bulbs should glow bright. If you get the lighted bulbs, measure Va on connector P35...BE CAREFUL as there is the risk of shock hazard present.

[microvibe]

Re: Panasonic tc-p42u2 psu or main issue

Power supply just clicks then clicks off again when jumper and with a board disconnected and bulbs hooked up no glow. I have 5v and 15v on psu so I guess problem is in vsus voltage circut

[microvibe]

Re: Panasonic tc-p42u2 psu or main issue

Could I use a psu from tcp54g25 connectors are same don't know if pilots are same on p6 p7 tho

[tw2005]

Re: Panasonic tc-p42u2 psu or main issue

Could I use a psu from tcp54g25 connectors are same don't know if pilots are same on p6 p7 tho

potentially but i'd get the manuals for each, compare the pinouts. Check the Vsus level for each but at least it's the same generation so could be close.

Missing Vsus would cause 7 blinks most likely and it's unlikely to come on until panel on command

[microvibe]

Re: Panasonic tc-p42u2 psu or main issue

Well it's main board. Anyone have lunch repairing one just to much to buy one.

[microvibe]

Re: Panasonic tc-p42u2 psu or main issue

Meant has anyone been successful in repairing a board or what seems is common failure?

[microvibe]

Re: Panasonic tc-p42u2 psu or main issue

Anyone. can't find much info on a board repair

[tw2005]

Re: Panasonic tc-p42u2 psu or main issue

I'm just wondering now if this is definitely A-board. I picked up a P54V20 and it was 10 blinks, something a little different about it. Found nothing shorted on the SC, and thought is this 10 blinks at plug-in. Swapped the P-board out and fired up.

What donors do you have, maybe another model P-board could do just for a test

[microvibe]

Re: Panasonic tc-p42u2 psu or main issue

I swaped in donor power board no different swaped donor a board not same model was 54gt25 but panel lights up stays on but board is wrong for TV panel . Original a board does nothing but 10 blinks when u press power not 10 blinks plugged in

[tn245]

Re: Panasonic tc-p42u2 psu or main issue

Might be worth taking some readings around IC4700. Looks to be responsible for sensing sub voltages and triggering SOS. Awkwardly located on the back of the board unfortunately.