Panasonic TC-P50S30 Plasma replaced SC Board

[turboaudi80]

My SC board had a dead short so I got a new one from shopjimmy and installed it. The TV turns on now but there is a nasty white artifact on the right side of the screen. It looks like a ghost but there is some text at the bottom. The entire picture is washed out, not nearly as bright as it used to be. I don't see specs for voltages in the manual, so I'm not sure what to do next. Any suggestions would be helpful.

-Eli

[tw2005]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I would post a picture of the issue. Anything else disturbed or disconnected fault finding it like buffer boards?

[turboaudi80]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

Here is a picture of the issue:

http://i894.photobucket.com/albums/a...1FD4A272AB.jpg

[tw2005]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

You can attach pictures using advanced, manage attachments. Too late for me to get into it, but a bit of work to do with that. Could have bad buffers.

[tom66]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

That's very odd. Does the blob move at all? I'm tempted to say the VAD adjustment on the SC is bad or your new SC board is bad. I doubt the buffers are bad. Either way do not run it for long as it may fry.

Only one suggestion: try matching position of VAD adjustment screw, if present, to the position on your old SC board.

[turboaudi80]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I don't see any adjustment screws or pots on the SC board.

The blob does not seem to move. I have only run it for a few minutes at a time, in fear of causing more damage.

Another bit of info: it was making having some sparkly image issues before it quit. Not sure if that is a clue.

[tom66]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I would send the board back to ShopJimmy and get it exchanged for a new one. I suspect it is bad.

[tw2005]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I don't see any adjustment screws or pots on the SC board.

The blob does not seem to move. I have only run it for a few minutes at a time, in fear of causing more damage.

Another bit of info: it was making having some sparkly image issues before it quit. Not sure if that is a clue.

I'd resistance check the SD/SU boards

SU41 pins 2,6,8

SD42 pins 6,2,1

with respect to the gnd plates on the boards, interconnecting ribbon disconnected and SC41,42,46 disconnected.

values can range from 200k ohms - about 2 meg

[turboaudi80]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I checked with items disconnected as listed, but I left the power terminal screws and ground screws attached, measurements taken from specified pins to ground terminals:

SU41
2 = 10M
6 = open
8 = open

SU42
1= open
2= open
6= 5.6 M

I used a basic DMM Fluke 12 which I think only measures up to 40M. I assume that should cover the necessary resistance range?

Should I isolate the boards before measuring (disconnect power supply screws)?

Are these readings a clue as to the health of the SD,SU boards?

[tw2005]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I checked with items disconnected as listed, but I left the power terminal screws and ground screws attached, measurements taken from specified pins to ground terminals:

SU41
2 = 10M
6 = open
8 = open

SU42
1= open
2= open
6= 5.6 M

I used a basic DMM Fluke 12 which I think only measures up to 40M. Should I borrow a better meter with the ability measure up to 200M?

Should I isolate the boards before measuring (disconnect power supply screws)?

Are these readings a clue as to the health of the SD,SU boards?

No a fluke is just fine, nothing shorted but readings are weird being open. i guess you tried reversing the probes?

[tw2005]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I checked with items disconnected as listed, but I left the power terminal screws and ground screws attached, measurements taken from specified pins to ground terminals:

SU41
2 = 10M
6 = open
8 = open

SU42
1= open
2= open
6= 5.6 M

I used a basic DMM Fluke 12 which I think only measures up to 40M. Should I borrow a better meter with the ability measure up to 200M?

Should I isolate the boards before measuring (disconnect power supply screws)?

Are these readings a clue as to the health of the SD,SU boards?

I was hoping something like this but this is on a set of 2010 boards so not 100% sure if they changed the design. You definitely got the right pins? one side is 2,4,6,8. the other 1.3.5.7.9.

maybe Tom's right. I'm unsure with this one.

SU41
2 = 10M VF5V 5.7M
6 = open VSCN-F 221K
8 = open VFO 2.2M

SU42
1= open VFO 2.2M
2= open VSCN-F 221K
6= 5.6 M VF5V 5.7M

[turboaudi80]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I checked the probe resistance and it was 1-2 Ohms, I did not reverse. The pins were labeled with 2 and 8 on the even number side of the terminal, so I'm pretty sure I got the right ones.

I don't understand the abbreviations you included between the resistance numbers here:

SU41
2 = 10M VF5V 5.7M
6 = open VSCN-F 221K
8 = open VFO 2.2M

SU42
1= open VFO 2.2M
2= open VSCN-F 221K
6= 5.6 M VF5V 5.7M

[tw2005]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I checked the probe resistance and it was 1-2 Ohms, I did not reverse. The pins were labeled with 2 and 8 on the even number side of the terminal, so I'm pretty sure I got the right ones.

I don't understand the abbreviations you included between the resistance numbers here:

SU41
2 = 10M VF5V 5.7M
6 = open VSCN-F 221K
8 = open VFO 2.2M

SU42
1= open VFO 2.2M
2= open VSCN-F 221K
6= 5.6 M VF5V 5.7M

that's what they are known as in the schematics and block diagrams, not that important just helps me comparison wise. Youd expect the same results for the same label on each board so for what it's worth you have almost. just not what i was expecting. usually low ohms or short when bad so could be ok.

Not the first time i've seen this so last time they worked out ok.

A little clueless on this one and the picture was only part screen but unusual display. SJ are usually ok but it does happen with secondhand boards that you get a bad one , no blink codes makes it tricky.

[turboaudi80]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I ran the menu driven self diagnostic and all came back ok.

[tw2005]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I ran the menu driven self diagnostic and all came back ok.

Was the display ok or same? Would not expect to see anything in there to give a clue. The TV was a 100% ok before the SC blew?

[turboaudi80]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I did some digging are figured out that I ordered the wrong SC board. I didn't realize mine had an "AM" suffix after the part number on the bar code sticker. Turns out the board without the suffix is for a different model.

I ordered the correct SC board and installed it, now I get 7 blink codes and no picture. According to the manual:

Driver SOS2 SU-Board
(SU/SD Connector DET) SD-Board
(SU/SD Scan and Logic IC) *

I don't understand what these notes mean to determine if I should go after the SU or SD board next.

Any guidance would be great.

[tw2005]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I did some digging are figured out that I ordered the wrong SC board. I didn't realize mine had an "AM" suffix after the part number on the bar code sticker. Turns out the board without the suffix is for a different model.

I ordered the correct SC board and installed it, now I get 7 blink codes and no picture. According to the manual:

Driver SOS2 SU-Board
(SU/SD Connector DET) SD-Board
(SU/SD Scan and Logic IC) *

I don't understand what these notes mean to determine if I should go after the SU or SD board next.

Any guidance would be great.

disconnect , the 3 connectors at the SD/SU boards, remove the 4 earthing screws on same, on SC board jumper 2 pin SC50 connector and power on the TV.

This will confirm if SC is triggering 7 blinks

[pwhite]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

I have been a member for just a few minutes and have already been successfully guided to a bad SC board and NOT the power supply.

Thank you!

Paul
North County Servicenter, Inc
Encinitas, Ca

[turboaudi80]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

disconnect , the 3 connectors at the SD/SU boards, remove the 4 earthing screws on same, on SC board jumper 2 pin SC50 connector and power on the TV.

This will confirm if SC is triggering 7 blinks

When I do the above, the tv powers on, but no blink codes now, just a steady power light.

[tom66]

Re: Panasonic TC-P50S30 Plasma replaced SC Board

This indicates SU/SD fault.
Can you post a picture of your SU/SD boards? They are the ones which connect to the SC.