[TechAssist] Re: GE M# 46GW950 CH# CTC169HN - Picture pulses on / off
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 7 Feb 2004 08:37:24 -0500
John do you have a training manual? Check CR7073, CR7058, and C7065.
Disconnect the raw B+ to the aux board and see if the audio is ok. If it is
and the B+ to the aux board is ok then you have a aux board problem. If you
need a scan of the trouble shooting for the aux board let me know.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- 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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