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Panasonic DMR-EX75EB - U81 issue.

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Turnip:
Hi folks,

Have one in displaying U81 - Had a look for duff caps under the centre board and found bulging C4056(470/16) and C1538(100/25) - Replaced - Still U81.

Wonder if there's any other likely causes ? - Thanks - Chris

astracat:
hi turnip
u81 is a communication error with microprocessor try pressing power for more than 5 secs then reboot also check connections on uart processor
regards
astracat

jordan:
Error code U81-posiblty
C-1530 (100uF/25V)
C-1533 (680uF/6,3V)
SMD IC-1508 (MD-5001T)

downunder:

Hi Chris,
If those caps were bulged. there's a good chance that IC1508 (Pana p/n CODAAJG0001) on the underside of the PCB will be faulty. It's an 8 pin DIL surface mount and supplies 1V8 to the Backend Module between HDD and DVD. You may see a tiny pinhole in one corner of the IC. Normal p/n for IC is MD5001.

I've also had the Backend Module cause it and on occasions have had to replace the entire board under the HDD in desperation.

Bruce

Turnip:
Hi folks, and many thanks,

Guess might hopefully be IC1508(MD5001T) although it looks pristine.

With back-end module out of the way might check any 1.8 voltage. Noticed C1533(680/6.3) had been replaced a while ago, by a chap who managed chew up the print a bit, just now need a S/M so can check voltages from the top.

Also noticed on line that an enthusiastic amateur did the whole job with the chip/caps change in half an hour, and suspects the next would take only 15 minutes - Bit impressed by Yoof - Chris.

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