[TechAssist] Re: RCA P52754AT chas. PTK 178LB Power supply dead

Ronnie, I have basically the same problem with a CTC178 chassis, only
instead of lightning, mine had mouses pee on the chassis. Do you need
portions of the schematic? I have the manual.  Did you remove the
flyback HV lead to the splitter?

I finally got mine to fire up, but a few seconds after, the vertical O/P
IC smoked. Thats the last I've worked on it. It belongs to my buddy and
he doesn't need the set right now, so I only work on it when I feel like
it, which isn't very often, hehehe. I had used my Chipper Checker on the
chassis and it told me there was a fault with U1503 (hope I am thinking
of the proper IC) which is the tone/ balance/ volume controller. I
replaced that and U1600 (again, not sure if I'm thinking of the right IC
because the set is not in front of me). Then set fired up but this
vertical problem happened. You may have a totally different fault than I
did, so it might pay you to get a Chipper Checker if you don't have one.
I got mine from Jason at Excel. 



Gary McCartney

McCartney Electronics
7134 Fife Rd, RR 7
Guelph Ontario Canada N1H 6J4
Fax: (519)821-1530
email: number63 (at) inetsonic.com






Ronnie Alston wrote:
> 
> Lightning damaged:
> Replaced shorted Q4101 (chopper output),  U4101 reg ic, Q4101 5v. reg,
> u3101, u3102 micro/eprom kit.
> Checked all associated parts in immediate chopper ckt area. 5v standby is
> now working, and when pwr is pressed the micro tries to turn on q3101 switch
> going to u4101 pwm controller. I have checked to ground all power supply
> sources coming off of T101 chopper transformer and didn't find any low ohms.
> I have searched all three of my tip programs and none of them seem to have
> any information on this particular PTV and rca fix-finder didn't have hardly
> anything on it either.
> They must have only made only one model of these and decided that it was a
> bad design and not made any more of them.
> ANYWAY,  I sure would appreciate any help on this one.
> 
> Thanks in advance,
> Ronnie Alston
> Alston's TV Service
> 110 North Third Street
> Ozark, Ark. 72949
> Fax #479-667-2220
> 
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