[TechAssist] Re: GE M# 46GW950 CH# CTC169HN - Picture pulses on / off
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 7 Feb 2004 08:59:10 -0500
That's C7065.
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 8:55 AM
Subject: [TechAssist] Re: GE M# 46GW950 CH# CTC169HN - Picture pulses on /
off
> Thanks Al,
>
> Yes, I have the training manual & the troubleshooting guide. I never
thought
> about pulling them out, though. I'll pull them out.
>
> I'll try replacing those diodes. I found two of them, but can't find
CR7065
> in that circuit. Could you mean CR7056?
>
> I pulled the raw B+, as you suggested, and still had audio.
>
> Here's a new glitch. I was just scoping the signal at pin 4 of the chip.
The
> manual calls for a rather garbled waveform about 2.3V P-P. It is switching
> between this waveform, and a Sine wave. It is doing this at a rythmic
(about
> 1Hz) rate. I was starting to suspect the regulator IC, and I may still
throw
> one in, just for giggles.
>
> Thanks
>
> John Myers
> Myers TV Service Since 1984
> Alliance, OH
> ph 330-821-6545
>
> ----- Original Message -----
> From: "al m" <ampm@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Saturday, February 07, 2004 8:37 AM
> Subject: [TechAssist] Re: GE M# 46GW950 CH# CTC169HN - Picture pulses on /
> off
>
>
> > 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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