PANASONIC Plasma TH-37PX80BA 7 blinks of death

[pwv]

My Panasonic Plasma has the Power Red LED code of 7 flashes.
The manual states it will be the SC (YSUS) (TXNSC1BSUB TNPA4644) Floating Voltage area, and/or SM (SU & SD [buffers on one board]) boards.

I have: disconnected the SM BOARD and powered up - no change,
then disconnected the SC board, both the SC2 (VSUS) & SC20 (Ribbon)- no flashing LED
I have re-connected SC board's SC20 and flashing LED is back
Not certain if this procedure is correct - some info on this site for a different model requires a SC50 jumper shorted after the buffers are disconnected.
I have from ebay a spare SM board, but reluctant to install until I can verify that my disconnection proc is correct.
Not being experienced in TV repair - I haven't done any testing live or know how to bypass the error circuit not wanting to damage other working parts.

So ground (excuse the pun) to a halt - spent hours searching net.

[flocko]

Re: PANASONIC Plasma TH-37PX80BA 7 blinks of death

Check the SC board to see if its shorted across the SC2 socket. You can also check SM board for shorted buffer ICs with a meter set to low ohms (200ohm )one lead to the connecting VFG screws (were the SM is joined with the four screw pads to the SC) run the other lead across the ribbon sockets any shorts show faulty buffers. both test should be done with the boards removed from the set

[pwv]

Re: PANASONIC Plasma TH-37PX80BA 7 blinks of death

Yes checked already checked sc2 and measured VSUS, but found some info (about a different model) that said if the su sd boards are disconnected then the TV shuts down. based on this I fitted the spare SM from ebay, and the TV works except NOW I have a few groups of black horizontal lines superimposed on a good picture.

Any ideas, suspect could be the spare or the connections, would like to be armed with a cause before stripping it down tomorrow.

[Moreno83]

Re: PANASONIC Plasma TH-37PX80BA 7 blinks of death

Yes it can be the ribbon cables going into the SU/Sd boards. If they are badly seated they cause black bars/lines.

[flocko]

Re: PANASONIC Plasma TH-37PX80BA 7 blinks of death

You have not fitted the ribbons in correctly , Turn the set off and leave for a few mins,then adjust the ribbons that line up with the lines showing on the screen. Do Not adjust with power on as this can damage the panel so power off and leave before adjusting

[pwv]

Re: PANASONIC Plasma TH-37PX80BA 7 blinks of death

Hi

Thanks for coming back on that, I was thinking that was probably the cause, this time i will double check before putting the 37 screws back. Will let you know how I got on. Funny how the picture is good.

[pwv]

Re: PANASONIC Plasma TH-37PX80BA 7 blinks of death

Worse than it was now, tried about 5 times, thinking some electrical cleaner might be a good idea.

[Moreno83]

Re: PANASONIC Plasma TH-37PX80BA 7 blinks of death

No don't use that. The ribbon cables are not seated correctly.

The brown handle needs to be all the way open. Put the ribbon cable gently into the slot and you will hear a small "click". Thats the edge of the ribbon cable clicking behind the white plastic. Apply a little pressure in the middle and pull the handle down.

Check for copper lines , if you see them then the ribbon cable is badly seated.

[pwv]

Re: PANASONIC Plasma TH-37PX80BA 7 blinks of death

Hi
Finally a screen clear of black lines
I think, in the end it came down to insertion technique, although I found some spray and cleaned the contacts.

So thanks guys.

[Moreno83]

Re: PANASONIC Plasma TH-37PX80BA 7 blinks of death

Good job and don't worry. Even the most experienced tv repair guys are struggling with the ribbon cables...