[TechAssist] Re: RCA F35100ST CTC169BG No Hor. Drive
- From: "becyn" <becyn@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 10 Jun 2003 12:47:04 -0400
Is the T chip oscillator working?
I think it uses the usual 500khz xtal for v-h sweep countdown.
Ocassionally one fails.
Just a thought...
Jim McVey
McVey Alltronix
327 Broadway
Newburgh Ny 12550
ph: 845 561 8383
fx: 845 561 9017
Consumer electronics &
computer service.
Factory authorized for
over twenty brands.
----- Original Message -----
From: "Larry E." <videotech@xxxxxxxxxxxx>
To: "tech-assist" <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, June 10, 2003 12:29 PM
Subject: [TechAssist] RCA F35100ST CTC169BG No Hor. Drive
> Hi Guys, This RCA has come back to haunt me, originally came in as dead
> set,
> replaced the chip, chopper, 3 caps, CR4118, C4145 and repaired broken
> traces on far left side of board, set ran fine, delivered to customer,
> approx. 10 days later set died. Switch mode is working but regulated B+
> is high at 150 volts, I have drive pulses to base and collector of
> Chopper transistor. There is no drive signal from pin 38 of U3101 to the
> base of the hor. driver transistor. R4314U is burnt but not open,
> shorting c-e of Q4304 will not force set on. I have a tech note that
> says if reg. B+ is high to replace cr4123 but this diode is not shorted
> and voltages are correct. I`m
> pulling my hair out at this point, Any ideas on what I`m missing???
> Larry E
>
> Larry Eastman
> American TV & Electronics
> Crystal River, Fl. 34428
> tvjunkyard.com
>
>
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