[TechAssist] Re: Zenith PTV: A50M84W1 dead. fix.
- From: "tvdoc" <tvdoctors@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 16 Oct 2002 08:43:10 -0700 (Pacific Daylight Time)
I've had several of these and currently working on one right now. Most of
these just have a shorted QX3200 that overheats and shorts out the CXR3412
due to bad drive connections. The power diode literally burns up and
sometimes chars the board. I have had a few that have had bad flybacks, so
now whenever I find this situation, I replace the fly, transistor, diode and
resolder all the connections in the drive circuit. Zenith really done a
booboo with this board. They should have stuck a load resistor or a fuse
between the diode and the fly. I have seen some of these that look like they
almost caught on fire. I'm thinking about modifying the circuit when
repairing these boards by integrating a pico fuse someplace. Neil TV
Doctors Monroe,Wa.
-------Original Message-------
From: techassist@xxxxxxxxxxxxx
Date: Wednesday, October 16, 2002 08:23:35
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Zenith PTV: A50M84W1 dead. fix.
Found on the SMPS/Defl. module 9-1978-01 the HOT QX3200 and power diode
(on heat sink at board edge) CRX3412 both shorted.
Replaced module, problem solved.
Note: Often this damage is due to a bad HV Bleeder/Splitter/Focus block#
A-17196-12 (About $126.00 cost) tho mine was OK.
Phil Bader
--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: philbad@xxxxxxxxxx
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