Panasonic TC-P65GT50 8 LED blink failure

[brent01]

As the title indicates, I own a Panasonic TC-P65GT50 that just started experiencing an 8 LED blink failure mode.

I have performed initial troubleshooting.

1. When I remove the connection between the SS board and A board the TV powers fine with no flashing LEDs.

2. I checked the continuity on the plasma panel and the SS/SS2 boards and the resistance between pin 1 and pin 2 on all the connectors ~ 0.3 ohms.

3. I removed the SS board and have inspected and have not found any visual issues.

4. I found D051, D052, D053, D041, D042 are shorted. The markings on the top of the package say RFUH20/NS35/1234AW/008. I am wondering if it is worth ordering these ICs and replacing them or would you just order a new SS board?

SS board = TNPA5648 and not having much luck finding a replacement since the TV is 6 years old.

[tw2005]

Re: Panasonic TC-P65GT50 8 LED blink failure

As the title indicates, I own a Panasonic TC-P65GT50 that just started experiencing an 8 LED blink failure mode.

I have performed initial troubleshooting.

1. When I remove the connection between the SS board and A board the TV powers fine with no flashing LEDs.

2. I checked the continuity on the plasma panel and the SS/SS2 boards and the resistance between pin 1 and pin 2 on all the connectors ~ 0.3 ohms.

3. I removed the SS board and have inspected and have not found any visual issues.

4. I found D051, D052, D053, D041, D042 are shorted. The markings on the top of the package say RFUH20/NS35/1234AW/008. I am wondering if it is worth ordering these ICs and replacing them or would you just order a new SS board?

SS board = TNPA5648 and not having much luck finding a replacement since the TV is 6 years old.

How did you check these? Was it the tab to one of the legs or across the legs?

[tw2005]

Re: Panasonic TC-P65GT50 8 LED blink failure

[brent01]

Re: Panasonic TC-P65GT50 8 LED blink failure

It was across the legs....pin1 to pin3.

[tw2005]

Re: Panasonic TC-P65GT50 8 LED blink failure

It was across the legs....pin1 to pin3.

go back and do it tab to leg, leg to leg will always be short on these. You can clearly see the legs of 051-053 are all soldered to one solid piece of copper track. And the same applies to 041,042

[tw2005]

Re: Panasonic TC-P65GT50 8 LED blink failure

Q101 , 103 are either shorted?(RCJ300N20)

[brent01]

Re: Panasonic TC-P65GT50 8 LED blink failure

I just checked the datasheet for RFUH20 diodes and the legs are tied together. The leg-to-tab connections are not shorted on the diodes.

Q101 ~25M between leg and tab, ~46.7k between legs.
Q102 ~ 500k between leg and tab, ~46.7k between legs.

Do you happen to have a schematic for this board?

[tw2005]

Re: Panasonic TC-P65GT50 8 LED blink failure

no, but you could try a download of the TC-P60GT50 which would do for the most part. don't be surprised if you can't enlarge it claerly.

So you've checked all transistors on this and none shorted?

It would appear these boards are around.

https://encompass.com/item/9555994/P...YUUPS/Pc_Board

I'd be tempted to get this one and add the capacitor if you are really stuck.

http://www.shopjimmy.com/panasonic-t...u-ss-board.htm