hi all.i found a Panasonic vierra in the trash and i found the sc board was short ,then i test the buffer=2.5m ohm so that ok i think now i found on the sc board d865 q401-402 q421-422-423 and q661 was shorted ...now im here ....anybody ave sucess repair this board....(sorry may contain error im a french dude) im waithing for part to arrive
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Last edited by tipat; 01-06-2014, 11:16 PM. -
Re: try to repair 50" panasonic "tnpa4782"
first i ave the 10 blinks, after board isolation it go 6 blinks=su-sd/sc board in the troubleshooting guide .....when i unplug the sc board only, the vsus go to 200v then drop slowly to zero and the green led is on ss board ,that tell me my ss is ok if the sc board is plug =no voltage at all each side and no light on ss board -
Re: try to repair 50" panasonic "tnpa4782"
I have a Panasonic 50px80a it does two blinks I believe its the 15v cap on the power board with the back off I plug it in there are two clicks followed by one more on the power board how do I find which part I need to replace ? cheers in advanceComment
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Re: try to repair 50" panasonic "tnpa4782"
i found info for your 50px80a the 2 blink code for your tv is a sos 15v it MAYBE
came from the "d" board ...These 3 conditions can cause the TV to shutdown and the power LED to blink 2 times=Missing P15V
2.
A short of the P15V
3.
Wrong diagnostic by the D board......When troubleshooting a PDP TV that is shutting down and the power LED blinks 2 times:
Find out if 15V is output at pin 1 of connector P7 of the P board.
If no voltage is output, measure resistance between pin 1 of connector P7 and ground (Chassis). If a shorted 15V is detected, find out if it’s coming from the P board or if it’s coming from any of the other boards that the 15V volt is connected to.
If the P board is OK, disconnect the connectors providing the P15V to all these boards while measuring resistance between pin 1 of connector P7 and ground.
The defective board is found when the connector that provides the P15V to that board is removed and the short circuit is no-longer presentComment
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Re: try to repair 50" panasonic "tnpa4782"
what kind of diode is d865 ?? (voltage/amp)part name b0eckp000047Comment
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Re: try to repair 50" panasonic "tnpa4782"
D865 is the diode number the on the board. the other number is the manufacturers part number. If the diode is not fried or broken, remove it and get the number off the part if possable obsrving the polarity markings if drawn on the boards silkscreen.Comment
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Re: try to repair 50" panasonic "tnpa4782"
most likely a 1N4007 general purpose diode if the b0eckp000047 give the correct clue in the last part of the number or its a coinceidenceComment
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Re: try to repair 50" panasonic "tnpa4782"
on th diode is 88 94 .Under there nothing . i read in another post that diode is rohm 400v 1a correct me if im wrongComment
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Re: try to repair 50" panasonic "tnpa4782"
i was thinking to put a 1n4004 ???Comment
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Re: try to repair 50" panasonic "tnpa4782"
ok i order the part ..thankComment
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Re: try to repair 50" panasonic "tnpa4782"
hummm..all the part replace blow ...i miss one or more somewhere lolComment
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Re: try to repair 50" panasonic "tnpa4782"
Unfortunately replacing just the IGBTs rarely works. Finding all the shorted big stuff is easy.
Other items to watch out for are failed 5v regs, inverter ICs, FET drivers, gate resistors, smd transistors, diodes, optocouplers.
Worst thing about a failed repair is potentially more parts damaged now.
It's a tough task.
Another guy has been trying and replaced a lot more than that and his Q661 blew again.
I've done a TNPA5081, that's it. Try a search and have a read. Might giive some insight, cct have some similarities.
A TNPA4829 was just fixed purely on IGBTs and a diode, luck of the draw.Comment
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Re: try to repair 50" panasonic "tnpa4782"
your right both sd/su board read short !!! need 3 new board now!!dohh!Comment
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Re: try to repair 50" panasonic "tnpa4782"
I replaced a lot of things on TNPA4782, not just IGBTs, but obviously missed something and it blew again
I'll open a new thread so hopefully will get some help and fix it this time
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Re: try to repair 50" panasonic "tnpa4782"
Yeah, well that goes without saying. Always check those before installing a Sc replacement, it may have blown regardless but now you don't know.
You can always jumper SC50 on the Sc and power up without the buffers in future. that's how I tested my repaired SCs initially but still buffer board resistance needs checking before final test.
Any info on how you checked the buffers and what was short? I have had the 5V line on the buffers shorted and the 5V reg on the SC had failed also that supplied it. That was on the 2010 series I was working on.
Not overly familiar with this one though, 2009 model.Comment
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Re: try to repair 50" panasonic "tnpa4782"
3 new board on it and voila like a news ....pain to seat the ribbon cable correctly lolComment
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