[TechAssist] Re: RCA F35100ST CTC169BG No Hor. Drive
- From: "Larry E." <videotech@xxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 10 Jun 2003 14:27:51 -0400
Hi Guys, Thanks to Phil Hull and Jim McVey this set is almost fixed, replaced
Y4301 from a boneyard set and the set comes up now, C4141 was okay, now
the picture has thin black lines all the way across the screen about one inch
apart
all the way down from the top to the bottom of the screen and these lines roll
from top to bottom fairly slowly almost like a bad B+ filter cap, will make some
more checks and post what I find, Larry E
"Larry E." wrote:
> 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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