[TechAssist] Re: Philips Magnavox TS2746 C101, Chassis 27F800
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 11 Jun 2003 15:55:50 -0400
Ken,
I have been there, done that with the same components failing. Turned out to
be a bad yoke (which are high failure items on these F8 chassis). In fact, I
just changed another one.
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
www.geminicomputertvsecurityalarms.com
----- Original Message -----
From: <gulftech@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, June 11, 2003 3:49 PM
Subject: [TechAssist] Philips Magnavox TS2746 C101, Chassis 27F800
> 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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