Question about Panasonic TH-50PHD7UY 50 in. HD-Ready Plasma Television

1 Answer

Need help troubleshooting sudden "no signal" error

Setup: TH-50PHD7UY with DVI card (TY42TM6D). Plasma is fed signal only through DVI cable. Cable is connected to an Anchor Bay iScan HD scaler/processor. I have a DVD player and a TiVO (HD) connected to the scaler. Problem: Have had this setup, working since December 2004. Now, for the past month, the video signal suddenly cuts out with the message "no signal" displayed. This happens either with a DVD or Tivo program being displayed, Which seems to rule out either of these devices. The signal drop times vary - sometimes the display will last 2+ hours, othertimes it will only last 20 minutes. I've taken to powering down the monitor to see if this is related to its reaching full operating temperature. It does not seem to matter. It does not seem to be overheating. If I power the monitor off, and then back on, I get the picture back, but typically only for a few minutes. If I power cycle the scaler, the image on the monitor does not restore. This seems to point to either the plasma monitor itself (ugh!) or the DVI card - I am hoping it is the latter since I want to upgrade to HDMI (provided a card is even offered for this model). I've jiggled cables, etc to rule out a bad connection. I have not tried bypassing the DVI card yet and going component in, simply because of the huge hassle it will be. But I suspect I will need to next. Any sage advice out there, diagnostic technique, similar experiences? Thanks! Tony

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  • GeneP Dec 21, 2007

    Tony,



    I have begun having the same problem. I have 2 of the DVI boards installed and they both act the same way. After some testing, I did see that when the DVI signals cutout after a couple of hours, the component signal is completely unaffected.

    I have also run the component signal straight through ~28 hours with no drop at all, which to me suggests it is not an overheating problem.

    I did call and log a case and twice had a local shop engaged but they have been pretty useless in getting to root cause and fixing it.

    Did your issue get resolved? if so, can you let me know the outcome, parts replaced, etc?

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This is an issue with IC 803 on the Z board. This is a 3.3 V regulator that supplies this voltage to the slot card cage. Most input boards use this voltage EXCEPT the component board which is why it keeps playing along whike the DVI, HDMI, or composite signals will cut out after warm-up.

This is a surface mount multi-pin IC and is a bit tricky to replace.
The entire board is PN# TNPA3198xx with suffix determined by what model 7 series plasma you have.

This was a problem from around Nov. 2004 to Mar. 2005

T Wiz

Posted on Mar 25, 2008

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Posted on Jan 02, 2017

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