Panasonic Viera TC-P65S2 SC board repair

[Hoosier2014]

I had a thread, but maybe it was lost. Why do these boards go bad. Board is TXNSC1MAUU PANASONIC SC (TNPA5175). I have new buffer boards, but not going to install since I jumped SC50 and continue to have 7 blinking light error code. I now have to bad SC boards and I'm hoping there are enough parts between the two that I can at least fabricate 1 working board. I contacted the repair company tw2002 recommended and they are only 60 miles south of where I live (bonus), however I want to troubleshoot the SC board for component that have failed. HELP with this would be awesome.

PS: Tom mentioned ground screws and suggested replacing them, I found many loose screws on the power supply board...how tight should these be screwed in? Would it be worth buying new screws and washers for SC board from local hardware store?

JB

[tw2005]

Re: Panasonic Viera TC-P65S2 SC board repair

Start off using continuity test looking for shorted out parts. Start with the heatsinked components. Q locations are transistors, D are diode and the legs A anode, K cathode.

The likelihood of making one from two would be very slim I would expect.

You could search tnpa5081 and maybe get some ideas from those rebuilds i did as the S2 is the same generation and the cct designs are very close.
parts used may be same too but straight up q661 is a RJP56F4A where on mine RJP63F3A.

Difference there would be 560V IGBT to a 630V IGBT

I would expect surface mounted components to be failed too, so can you manage to desolder / solder small multipinned items?

Modus was the best option when the sale was on, which is no longer.

Still is the safest way to get this going again.

Something to try to be sure there's no A board issues, disconnect Sc2,SC20,SS11, P35, 3 white ribbons at the A board and see if the TV turns on with no blinks.

Turn off and leave those power cables disconnected for several minutes before you hook them up again so nothing gets spiked.

This will confirm that the A is not causing 7 blink which I would not expect but slim chance it may.

[selldoor]

Re: Panasonic Viera TC-P65S2 SC board repair

@tw2005 - would it be better to copy his post and yours to the old thread and stop using this one. I dont know how he thought the other was lost as he posted to both within a few minutes?

[Prop1]

Re: Panasonic Viera TC-P65S2 SC board repair

@tw2005 - would it be better to copy his post and yours to the old thread and stop using this one. I dont know how he thought the other was lost as he posted to both within a few minutes?

He should be subscribing to his thread so he can always find it no matter how buried it gets.

[Hoosier2014]

Re: Panasonic Viera TC-P65S2 SC board repair

Sorry for the double post. I was unsure what had happened the my original thread. I had to hunt for it since new posts were being created. My apologies, and thanks for the help. I understand your guys frustration.

John

[Hoosier2014]

Re: Panasonic Viera TC-P65S2 SC board repair

Hey guys,

I ended up sending the SC board to Moduslink for repair. I have a new SD and SU board.

When the repaired SC board arrives, is there anything that I need to do prior to installing all 3 boards? Anything that needs to be checked so I don't blow these boards?

Thanks,

John

[Hoosier2014]

Re: Panasonic Viera TC-P65S2 SC board repair

Would love a reply to this. I'm ready to go.

My only concern are the washers that fit the SC board to the panel. They are bowlshaped curved....like they were screwed too tight and not have a new shape. They are still in contact with the circ metal on the board it self.

Thanks

[tw2005]

Re: Panasonic Viera TC-P65S2 SC board repair

As a quick test, put meter in continuity or diode mode . place one end on the earth plate where the bolts go in the buffer boards, then slowly run the other probe along each and every pin on the output connectors that connect to t he ribbons.

Should not see any shorts.

I'll find the resistance test for you shortly.

[Hoosier2014]

Re: Panasonic Viera TC-P65S2 SC board repair

Thank you,

I'm on it and will get back to you.

[tw2005]

Re: Panasonic Viera TC-P65S2 SC board repair

here, trust you have a good meter.

[tw2005]

Re: Panasonic Viera TC-P65S2 SC board repair

Thank you,

I'm on it and will get back to you.

Sorry, dopey me forget to say what to look for with that first check. Should not see any shorts between gnd and output.

[Hoosier2014]

Re: Panasonic Viera TC-P65S2 SC board repair

I think I may be in business. Screen is on, not vertical or horizontal bars. It could be xmas in July. I'm so thankful tw2005.

Now, is there a firmware update that I need to do? I'm so afraid to turn it on again...

If there is a new firmware, can you lead me to the instructions?

Thank you

[tw2005]

Re: Panasonic Viera TC-P65S2 SC board repair

sure, but it only mentions HDMI connection improvement.

I've repaired 2 50V20 which is the next spec level and I found a firmware update for them. made no mention of SC board issues etc but for Viera upgrade.

I did it anyway, both are still running fine without the Sc blowing. I've added 7000hrs on this board, original lasted 2500hrs. Could simply be luck of the draw, I don't know.

If you do this, follow the instructions precisely. if anything goes wrong eg TV is turned off or loss of power whilst it's writing to the eeprom then the TV will be bricked.

http://panasonic.jp/support/global/c.../down_nap.html

[tw2005]

Re: Panasonic Viera TC-P65S2 SC board repair

Oh, do you know how to enter service mode to check how many hours this puppy has clocked up?

[Hoosier2014]

Re: Panasonic Viera TC-P65S2 SC board repair

I do not know how to check how many hours this TV has. I know it is important so any help will be appreciated.

I saw the update is for HDMI support, do you think I need this?

[tw2005]

Re: Panasonic Viera TC-P65S2 SC board repair

I do not know how to check how many hours this TV has. I know it is important so any help will be appreciated.

I saw the update is for HDMI support, do you think I need this?

No idea but if it was me I would apply it but just had to warn you of the small risk involved. I've done it on mine and it's straight forward, follow the instructions, I think you need a SD card.


When you enter service mode, don't fiddle with any adjustments, just push 1 on remote until srv tool comes up on the left, then ok to enter , then it will be a blues box, arrow to the bottonm right field indicated in the guide and then mute button for 3 secs or more until it populates.

feel free to take some snapshots and post them up.

[Hoosier2014]

Re: Panasonic Viera TC-P65S2 SC board repair

Here are the current settings:

[Hoosier2014]

Re: Panasonic Viera TC-P65S2 SC board repair

I'm actually not sure if I need to do the update or not. I'll wait until I hear from you. In the meantime, can I scan for over the air channels? I hooked up an antenna, but really don't want to screw things up.

Thanks

[Hoosier2014]

Re: Panasonic Viera TC-P65S2 SC board repair

I'm actually not sure if I need to do the update or not. I'll wait until I hear from you. In the meantime, can I scan for over the air channels? I hooked up an antenna, but really don't want to screw things up.

Thanks

[Hoosier2014]

Re: Panasonic Viera TC-P65S2 SC board repair

Can anyone tell me if the current firmware settings in the image above are the current ones for this TV? I will update the firmware if I have to, however I need to know the aforementioned first.

Thanks,

John