Question about Panasonic SC-HT900 System
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Posted on Jan 02, 2017
SOURCE: Powerdown after a few seconds
Changing IC001 fixed my problem with a DMR 55 -classic start-over symptoms slowly getting worse, although once the unit managed to start it would normally work okay except for occasional breaks during recording. Interestingly, it only struggled to start when a double-sided, cassette RAM disc (the ones like a big PC floppy disk) was in the drive. No disc, or a single sided non-cassette disc was fine ! Before changing IC001, I measured the DC voltages at the "ribbon" connector onto the main board whilst the unit was trying to start. Every time it failed, all the DC voltages disappeared suggesting that the Power Supply circuit was also completely shutting down, and reinforcing suspicions of a dodgy IC001. The Power Supply board was also quite badly discoloured under IC001 suggesting it was getting very hot. I noticed that at the points the heat sink is soldered to the board, the board was not at all discoloured suggesting that very little of IC001's heat was being dissipated in to the heat sink, but being conducted down IC001's leads (were the board was most discoloured). Like other's had commented, IC001 had no thermal grease between it and the heat sink !!!! I also extended the original heat sink by joining more aluminium I had spare, in an attempt to keep the replacement IC001 as cool as possible. Well done to everybody who did the "trail blazing" on IC001 !!!!
Posted on Aug 21, 2007
CAPACITORS ARE THE MOST COMMON PROBLEMS WITH PANASONIC POWER SUPPLIES. THESE CAPACITORS EITHER BLOW UP ,CRACK OR BULGE ON THE TOP... IF YOU SEE ANY OF THESE REPLACE THEM... YOU CAN PUT A LITTLE HIGHER VOLTAGE TO KEEP THEM FROM FAILING BUT DO NOT CHANGE THEIR VALUETHIS IS THE CAUSE FOR NO PICTURE ONLY A BLINKING LIGHT ON YOUR TV BUT NOTHING ELSE.
Posted on Mar 01, 2012
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