Picked up another freebie, (it amazing what people throw away). I know this is a common problem and will do some thread searching. I haven't worked on a Plasma yet but I couldn't pass this one up. Upon my initial inspection I definitely found a problem as you can see in the close up picture there is an area of arc'ing maybe lightning damage on one of the boards.
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Panasonic Viera TC-P50G10 7 Blinking Red
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Re: Panasonic Viera TC-P50G10 7 Blinking Red
Actually looks like something may have been spilled in there that caused that, from the photo's. Up to you how you tackle this, I have the full circuit diagrams, you can try to repair the SC board, and there is also a way to run the set with the buffers disconnected to prevent any damage to them by jumpering a connection. So assuming the buffers have survived I would suggest you start taking some readings around that dodgy looking area.
Also test the connector that carries the VS and 15v supplies to the SC board, see that it's not shorted to ground on one of those rails.
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Re: Panasonic Viera TC-P50G10 7 Blinking Red
Well actually there only appears to be a VS supply on the SC board there, I think the 15v comes via a different path. Anyway on your first picture at the top left is a large connector with a blue and white wire. Check resistance on the SC board from the white connection to a ground point (or between the two points on the connector). Short there means more investigation and there's likely FET damage along with the problem you have observed. Panasonic call it VSUS rather than VS.
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Re: Panasonic Viera TC-P50G10 7 Blinking Red
It drops beacause of the SOS shutdown, TP16,17 - gnd or across c563(c16563) 100uf 10v cap is the 5V in,TP6,7,82 - gnd 15V in, also on Pin 8 IC581, pin 11 IC521, pin4,5 IC791,
you could measure the resistance there to ground in case something has shorted on the 5V & 15V
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Re: Panasonic Viera TC-P50G10 7 Blinking Red
I have a SC which had 380ohms, one of the 2 tiny 20pin buffer chips had shorted. Still have not got that one going either. TNPA5081, similar cct but where you have C563 I have 10uf ceramic with a 5.6K resistor across it. I get 5.6K on P5V which suggests across vcc-gnd must be much higher in value ince they're in parallel.
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Re: Panasonic Viera TC-P50G10 7 Blinking Red
Would this be a suitable replacement for the damaged diode?
http://www.digikey.com/product-detai...9AT-ND/2143013
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Re: Panasonic Viera TC-P50G10 7 Blinking Red
RF101L4STE25
http://www.digikey.com/product-detai...5CT-ND/2331722Attached Files
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Re: Panasonic Viera TC-P50G10 7 Blinking Red
If you have not already, download the manual. Order extras and there's probably more than just those 2 items. I'd expect that FET Q604 blown as well and those smd resistors can be bad even though they may look ok.
ERJ8GEYJ473
Specifications
Case Style Moulded
Depth 1.6mm
Dimensions 3.2 x 1.6 x 0.6mm
Height 0.6mm
Length 3.2mm
Maximum Operating Temperature +155°C
Maximum Temperature Coefficient +200ppm/°C
Minimum Operating Temperature -55°C
Minimum Temperature Coefficient -200ppm/°C
Package/Case 1206
Power Rating 1/4W
Resistance 47kΩ
Technology Thick Film
Temperature Coefficient ±200ppm/°C
Tolerance ±5%
http://www.digikey.com/product-detai...KECT-ND/203339
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