[TechAssist] Re: GE M# 46GW950 CH# CTC169HN - Picture pulses on / off
- From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 7 Feb 2004 11:14:43 -0500
John,
Check proper insertion of your Anode lead. If the gasket is missing, or not
inserted properly, will cause
this symptom.
Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
fax...717-564-4952
www.intrepid-video.com www.tech-repair.net
----- Original Message -----
From: <myers_tv@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, February 08, 2004 8:17 AM
Subject: [TechAssist] GE M# 46GW950 CH# CTC169HN - Picture pulses on / off
Hi,
This is an early production CTC169HN chassis.
I've already replaced the caps & Diodes in the Horizontal output section, &
recapped the power supply.
I've replaced the AFT Video det & AFT coils.
Now, my last problem is that the picture pulses on / off at turn on. If I let
it pulse for a minute or
two, it'll stop. This is the one I'm having trouble with.
The power supply on the PTV AUX board is pulsing. The raw B+ that comes in from
the main board checks OK.
I've replaced Q7051 the turn on transistor, and shorted Q7051 C-E as a test.
The voltage at U7004 - 4 is running about .4V instead of .89V that is called
for. The voltages at pin 3
(current sense input), and pin 1 are right on. I've tried heating & cooliing,
in hopes of finding a bad
cap.
I'm hoping that someone has seen this before, and can point me in the right
direction.
Thanks,
John Myers
Myers TV Service Since 1984
Alliance, OH
ph 330-821-6545
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