[TechAssist] Philips Magnavox TS2746 C101, Chassis 27F800
- From: gulftech@xxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 11 Jun 2003 14:49:43 -0500
Friends,
I wonder what I've missed? Came in as deck, would just click. Jumped
right on the vertical output 7401. Replaced it (STV9379/932212147687)
along with burnt resistors 3488, 3491, & 3492. Found a note that diode
6404 was changed to a 75-volt zener. This is a late production set and
had the zener in it. Changed it anyway. Also changed diode 6487 and cap
2487/100 ufd, 50 v).
A month later, it came back dead again, with V/O shorted and resistor
3488 open. This time, resistors 3491 & 3491 were OK.
Changed the whole mess again and the set is up. Question is for how
long? Yes, I used NAP parts and cleaned off the old heatsink grease and
applied new. BTW, the cap and the diodes tested good. The chip was
shorted p4 to p5--same as in the original repair. After two hours of
testing, the heat sink measures 105F.
Your thoughts are welcome.
Regards,
Ken Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL 32563
850-934-8324 (Voice) 850-932-0819 (Fax)
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