P50GT25 Panasonic 10/4 blinks

[badmo34]

I had a 10 blink code on the TV and replace the P-board which gave me a 4 blink code. I disconnected the SC board and had a 7 blink code then reconnected the SC and disconnected the SS and had 4 blinks.

Does this mean my SC board is bad and I should replace it and the SU/SD?

Did I need to replace the P board or is my original board okay?

Thanks for the help!

[tw2005]

Re: P50GT25 Panasonic 10/4 blinks

you have a classic SC failure, if you check across SC2 on the SC you'll most likely find it dead short which in turn shorts the PSU and spits out SOS4.

You can resistance check the SU/SD boards and if in spec should be fine to use.

https://www.badcaps.net/filedata/fetch?id=1948181

https://www.badcaps.net/forum/showthr...=26322&page=11

post 201

https://www.badcaps.net/forum/showthread.php?t=26322

https://www.badcaps.net/forum/showthread.php?t=22610

[badmo34]

Re: P50GT25 Panasonic 10/4 blinks

To check my SU/SD boards I followed these steps:

disconnect 3 white connectors,

remove 4 SU/SD gnd screws,

jumper sc50,

power on

At power on I had the 4 blink code again. Does this mean the only issue is the SC board or do I have issues with the SU/SD or both the SC and SU/SD?

Thanks for the help.

[tw2005]

Re: P50GT25 Panasonic 10/4 blinks

The procedure you followed is not testing the SU/SD but confirms whether the SC is good or not. Most useful for SOS7 faults as SC/SD/SU can cause this.

You most likely have a shorted Vsus line at SC2. Disconnect SC2 and power on and see if SOS4 clears ( which you did when you disconnected the SC for SOS7)or measure resistance across SC2 with the power cable removed and see if short. SOS4 is a PSU error but a shorted Vsus line will cause this. Common fault with these.

If SOS4 was still present , shorted vsus on the SS would be the next check.It would not hurt to also check if Vsus is shorted at the Ss but I think blown SS is rare on these.

Only way to know if SD/Su are ok is to perform the resistance tests as listed and is highly advisable otherwise you risk blowing up another Sc and given their availablity and cost it would be silly not to.

I have made this mistake and it cost me a new Sc. luckily I have managed to work out how to fix these so I ended up repairing that one and 2 more.

[badmo34]

Re: P50GT25 Panasonic 10/4 blinks

Thank you for your assistance, I have replaced the SC board and my TV is up and working, however I now had some static in my picture as well as a faint 2 inch horizontal bar which flickers across the middle of the screen.

I purchased the board used, does this sound like an issue with the board, or an installation issue that I created?

[tw2005]

Re: P50GT25 Panasonic 10/4 blinks

Post a picture of the issue. Could be simply mis seated ribbons at the buffer boards to panel. They can be tricky, usually there are markers or notches to assist in judging if the ribbon is straight and in all the way.

The connector that lines up with the lines is the one to check. Don't adjust with the panel on.

I assume you check the resistances on the buffers?