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TechInfo Sheet fax: 01344 853689
Audio Visual email: [email protected]
Product Group: Colour Television Model: Alpha 1 Chassis
Date: 22/10/98 Revision No: 01 Document No: 07
Subject: Common Faults
Subject: Panasonic Alpha 1 Chassis
Dead - no main HT Line..........................................................................IC801 faulty - STR54051M
Dead - no main HT line....................................................................Q801 or Q802 leaky - 2SD965R
Dead - no main HT line.........................................................................R803 open circuit - 560kohm
Dead - no main HT line..............................................................................D811 faulty - ON3105TV
Dead - D854 short circuit...................................................................check IC801/R815/C808/D807
Dead - HT line about 30v.................................................................replace Q551 and resolder T531
Low contrast picture.............................................................................R562 open circuit - 130kohm
Blank raster, sound OK............................................................................IC101 faulty - TDA4505M
No frame scan..........................................................................................IC101 faulty - TDA4504M
No line drive............................................................................................IC101 faulty - TDA4505M
Colour flashing at top of screen on VCR..............................................change C604 to 0.33uF at 16v
Teletext freezes after about 10 minutes...................................................................fit TZS803001 kit
Intermittent latching-up.......................................................................................dry joints on X3505
Upgrade for IC1202 - fitting 24C02A.......................remove R1201 & fit wire link in place of C1202
Nicam upgrade for TX2470 & TX2178..................................................................................TYSU1
Nicam upgrade for TXC71/74/78 & TX3370.........................................................................TYSU2
Nicam upgrade for TX2480...................................................................................................TYSU3
Panasonic CS U.K. Document No: 07
Model: Alpha 1 Chassis
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