Panasonic Plasma TV TH-P42XT50D PCB - 7 blinks

[Chaks]

Re: Panasonic Plasma TV TH-P42XT50D PCB - 7 blinks

Some update on my broken tv.
I disconnected the SN board (power + ribbon cable) and switched on the tv.
... I was greeted with a white screen and a low volume hiss sound from the speakers ( similar to ... when we switch on the tv without an input signal ). This time the screen was lit for close to 5 seconds before shutting off and the led started blinking 6 times ( six times ).

Some comfort that the panel was lit for 5 seconds and the hiss sound. I am waiting for someone to help me diagnose the SN board at the test point markings found on the pcb.

All the three DAF30A's have dead short at 1 & 3 ( image su-sc-sd-13 ).

[Chaks]

Re: Panasonic Plasma TV TH-P42XT50D PCB - 7 blinks

Thx tom66 and tw2005
If the SN board is bad then there is no point in spending for the panel. I bought this tv in June 2013 for $850. The new panel from panasonic will cost me $500 today that's why I opting for a used one I can further bargain but the retailer will not sell me below $275.
Plasma or led tv of 42 inches today cost between $800 to $900 here in India.

Unless I find a way to test the SN board and possibly replace defective diodes and ic's on the SN board I am stuck. This tv was manufactured in jan 2013 and you can see panasonic have updated the pcb design substantially. All test points defined in this forum for issues similar to my tv .... I don't know how to apply to this new SN board design.

( the local seller of used plasma panel does not allow me to even test at his place)

[tw2005]

Re: Panasonic Plasma TV TH-P42XT50D PCB - 7 blinks

Thanks tw2005.
Is there a way to test the buffer board (integrated sc,su,sd board ) if they are ok.
Why I am asking is a second-hand plasma panel is available at a local seller for my tv model but he wants me to purchase it first (non returnable). $300 for the panel alone and for installation I have to manage myself.
If the (sc,su,sd) boards are ok then I may buy the panel ... otherwise I have to sell the TV at a scrap value.
(I had already overturned the tv on the table before I thought of posting on badcaps.net so I could not take a snap of the cracked panel.)

I should have known but these later models have a SN board(sc +buffers)

[tom66]

Re: Panasonic Plasma TV TH-P42XT50D PCB - 7 blinks

Can you attach the boards to his panel to test it?
If the boards are already bad there is no harm - it will just not work.
It is not possible for bad boards to damage the panel as it's basically just glass - assuming Vda is OK (check on your set) but that would be very unlikely anyway.
I don't know what the prices are like in India but $300 for a panel seems too expensive, surely a new TV will be cheaper.

[Chaks]

Re: Panasonic Plasma TV TH-P42XT50D PCB - 7 blinks

Thanks tw2005.
Is there a way to test the buffer board (integrated sc,su,sd board ) if they are ok.
Why I am asking is a second-hand plasma panel is available at a local seller for my tv model but he wants me to purchase it first (non returnable). $300 for the panel alone and for installation I have to manage myself.
If the (sc,su,sd) boards are ok then I may buy the panel ... otherwise I have to sell the TV at a scrap value.
(I had already overturned the tv on the table before I thought of posting on badcaps.net so I could not take a snap of the cracked panel.)

[tw2005]

Re: Panasonic Plasma TV TH-P42XT50D PCB - 7 blinks

just for you,I'll copy and paste.

Photos of everything except the panel fault and crack. I'm thinking chances are the panel is stuffed unless this has a fascia glass panel in front of the screen but if it shut down with 7 blinks after impact then, the impact was enough for panel shorted, also means the buffer board most likely shorted , also means SC also maybe bad but if the screen fires up briefly Sc could be ok. maybe the gas has not all leaked out yet but i think it's probably all over for this TV.

there's no glass fascia, the crack is the PDP cracked.

[Chaks]

Slightly cracked Panel ( 2 inch 'X' shaped crack on the left bottom side) got hit with a golf ball

Plasma Panel lits up with white screen for 2 seconds and shuts down with 7 red blinks ( blinking repeats with a 3 second pause)

Here is the link to the Panasonic Plasma TV TH-P42XT50D PCB Images of my TV.

https://drive.google.com/folderview?...Hc&usp=sharing

Hoping someone can help me diagnose the problem