[TechAssist] Re: Proscan M# PS52682 PTK171ACB, Wierd Chroma problem
- From: John Myers <myers_tv_b@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 20 Oct 2005 05:18:25 -0700 (PDT)
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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