[TechAssist] Proscan M# PS52682 PTK171ACB, Wierd Chroma problem-UPDATE

OK, I ordered the jungle chip for this dog, but it didn't help. Still, 
when I freeze the chip, everything returns to normal.
This morning, I wound up at the shop at 6AM, thanks to the time change. 
I did some thinking, and thought to check the B+ to the chip.
The 9V to the Y/C/V VCC input is running 11.1V!
I'm going to change the Zener in the 9V regulator circuit Monday night, 
and will report back on my progress.
Boy, will I be glad to spank this dog in the butt & send it home!


John Myers
Myers TV Service Co.
2212 W. State St.
Alliance, OH 44601

Voice / Fax: 330-821-6545
Myers_tv_b@xxxxxxxxxxxxx
http://www.myerstv.net

"[Luke:] I can’t believe it.

[Yoda:] That is why you fail."


John Myers wrote:
> 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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