Re: Panasonic sc tnpa5081 rebuild
I am in Toronto Canada
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Last Activity: 11-28-2022, 01:06 PM
Joined: 09-23-2014
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Re: Panasonic sc tnpa5081 rebuild
I have 2 Panasonic sc tnpa5081af working $100.00 eachLeave a comment:
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Hi
I am sorry to bother you but I do have a COV32809701 power supply with the same issue of low voltage on the 12v = 6.95V 24v = 15.64V and Both of the large caps are 163.2 VDC. I did replace d12 and checked other diodes and transistors with no help. it look as if tis is a common issue with the COV32809701 power supply. any suggestion.
thank you and I really appreciate your help.
Joshua...Leave a comment:
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Hi
I am sorry to bother you but I do have a COV32809701 power supply with the same issue of low voltage on the 12v = 6.95V 24v = 15.64V and Both of the large caps are 163.2 VDC. I did replace d12 and checked other diodes and transistors with no help. it look as if tis is a common issue with the COV32809701 power supply. any suggestion.
thank you and I really appreciate your help.
Joshua...Leave a comment:
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I did check resistors before and again today and thy are all good. what I am puzzled is why did Zener 871 and 872 go on this board. before I replaced them I did get a 6 blink code. I am at a lost at this problem. any other idea?...Leave a comment:
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Re: Panasonic sc tnpa5081 rebuild
this is what was replaced on the TNPA5105 jumper 50 no blinks
R 401 & 402
D451 & 490 & 491 & 618 & 652
D721
Q501 & 521 & 551
Q401 & 402
IC724
Q661
Q601 & 660
Ic501 & 521
Q451
Q421 & 422
Zener Diodes 871 and 872
the picture is noisy and low in brightness both when I display the menu and picture from HDMI
I was able to get a loaner SC board and the picture is perfect using the loaner....Leave a comment:
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Re: Panasonic sc tnpa5081 rebuild
Msg is for tw2005
I decided to take a look at the tnpa5105 board again with the 6 blinks and found that Zener Diodes 871 and 872 blown. replaced them and now I don't have any blink code and I do have a picture the problem is that the picture is noisy and low in brightness both when I display the menu and picture from HDMI, do you have any idea as to what should be the problem now?
Can you help me with thatLeave a comment:
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Re: Panasonic sc tnpa5081 rebuild
I decided to take a look at the tnpa5105 board again with the 6 blinks and found that Zener Diodes 871 and 872 blown. replaced them and now I don't have any blink code and I do have a picture the problem is that the picture is noisy and low in brightness both when I display the menu and picture from HDMI, do you have any idea as to what should be the problem now?Leave a comment:
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Re: Panasonic sc tnpa5081 rebuild
Hi I did more work on the TNPA5081 with the 6 blink error and found that the resistant in IC771 center pin to the left is is about 900ohm and in a good board i tested its about 1400ohm any suggestions?
by the way MID voltage is going up to 100v and then down once it detects the 6 blinksLeave a comment:
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Re: Panasonic sc tnpa5081 rebuild
blue capacitors?Leave a comment:
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Re: Panasonic sc tnpa5081 rebuild
I also replaced IC771 on the TNPA5105 with no results and checking resistant on the 15v, 5v and sc2 no short, checking voltage on sc20 I do get 5v and 15v and on sc2 about 200v until the 6 blinks when voltage go downLeave a comment:
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Re: Panasonic sc tnpa5081 rebuild
this is what was replaced on the TNPA5105 on both after replacing the parts I get 6 blinks and no more blown parts with jumper 50 on
R 401 & 402
D451 & 490 & 491 & 618 & 652
D721
Q501 & 521 & 551
Q401 & 402
IC724
Q661
Q601 & 660
Ic501 & 521
Q451
Q421 & 422Leave a comment:
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Re: Panasonic sc tnpa5081 rebuild
this is the list of parts replaced on the tnpa5081 rebuild...Leave a comment:
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Re: Panasonic sc tnpa5081 rebuild
I have tried to rebuild 2 boards TNPA5105 and TNPA5081 for the TNPA5105 I used the shopjimmy kit and for the TNPA5081 i used the Zentronix kit. Both of the board's will power up and not blow anymore parts but I get the 6 blinks on both with the short on the 50 connector. I have checked and rechecked with no success no parts blow any more but I get the 6 blinks I am at a loss can someone try and help meLeave a comment:
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Re: Panasonic sc tnpa5081 rebuild
I have tried to rebuild 2 boards TNPA5105 and TNPA5081for the TNPA5105 I used the shopjimmy kit and for the TNPA5081 i used the Zentronix kit. Both of the board's will power up and not blow anymore parts but I get the 6 blinks on both with the short on the 50 connector. I have checked and rechecked with no success no parts blow any more but I get the 6 blinks I am at a loss can someone try and help meLeave a comment:
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