[TechAssist] Re: Proscan M# PS52682 PTK171ACB, Wierd Chroma problem
- From: John Myers <myers_tv_b@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 20 Oct 2005 05:43:39 -0700 (PDT)
Will do Phil. I want to be positive on this first.
John
tjanphyl@xxxxxxxxxxxxxxx wrote:
Good show! Ok. When you are done, please post the "fix" with synptom,
IC location# and part# on chip, for later identification by others.
You said "U2001" but no number (RCA&part#on chip)
Glad to hear it.
Phil
Phil Bader, Pres.
Jan Phyl TV Inc
Winter Haven, Fl
(863) 299-8821
estab. 1976
personal email: pbader@xxxxxxxxxxxxxxx
----- Original Message -----
From: John Myers
Date: Thursday, October 20, 2005 8:18 am
Subject: [TechAssist] Re: Proscan M# PS52682 PTK171ACB, Wierd Chroma
problem
> OK, update time!
>
> First, this set does not use a splitter block like on the ctc169.
> The G2 is handled on a board that sits below the green CRT, at a
> 45 degree angle. I did a quick check by swapping the red & green
> G2 lines. Problem remains the same.
>
> Phil, U2401 sits beneath a shield which is behind the right
> (viewed from the rear) side of the AV jack panel board. I had to
> remove a couple modules to get to it. It is protected by a heat
> sink which appears to wrap around the top & bottom of the chip.
> After getting the numbers for Phil, I decided to try freezing the
> IC as a test. It didn't respond.
>
> Since I already had the chassis "opened up", I tried spraying the
> jungle chip U2001. instant success! I ran it through a couple more
> freeze/thaw cycles to confirm it. Looks like this dog is on its
> way to being fixed.
>
> Thanks Phil & Ron. If not for you guys, I'd have liokely wasted
> $60 on a useless IC. Bursma has the IC in stock for about $27. I
> can deal with that.
>
> Thanks,
>
> John
> Myers TV
> Alliance, OH
> tjanphyl@xxxxxxxxxxxxxxx wrote:
> Give me U2401's number on the actual part.
> I may have that chassis.
> Are you sure it's not the splitter block? try swapping the R,B,B
> anode
> leads and see result?
> Phil
>
> Phil Bader, Pres.
> Jan Phyl TV Inc
> Winter Haven, Fl
> (863) 299-8821
> estab. 1976
> personal email: pbader@xxxxxxxxxxxxxxx
>
> ----- Original Message -----
> From: John Myers
> Date: Wednesday, October 19, 2005 6:15 pm
> Subject: [TechAssist] Proscan M# PS52682 PTK171ACB, Wierd Chroma
> problem
>
> > HI,
> >
> > This has been here for a couple months. It plays for a minute or
> > two, then an interference pattern creeps accross the red & blue
> > CRT's, and they go dark. As they go dark, the green CRT gets
> very
> > bright (no retrace lines).
> > I've been able to track it back as far as the r-y, and b-y lines
> > coming from the Progressive Scan IC, U2401. In the morning, I
> hope
> > to check voltages on U2401. But, I'm hoping to not have to
> replace
> > the IC as a test. The dealer cost is $60!
> > Has anyone heard of anything like this on the CTC170/171 family
> of
> > chassis?
> >
> > Thanks,
> >
> > John Myers
> > Myers TV Service
> > 376 E. State St.
> > Alliance, OH 44601
> > PH 330-821-6545
> > e-mail: myers_tv_b@xxxxxxxxxxxxx
> > http://www.myerstv.net
> >
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Thanks,
John Myers
Myers TV Service
376 E. State St.
Alliance, OH 44601
PH 330-821-6545
e-mail: myers_tv_b@xxxxxxxxxxxxx
http://www.myerstv.net
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