[TechAssist] Proscan M# PS52682 PTK171ACB, Wierd Chroma problem-FIXED
- From: "John @ Myers TV " <myers_tv_b@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 03 Nov 2005 21:18:52 -0500
OK, here we go.
Symptom: This 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).
If I leave it go, then the blue & green go dim, and the red gets bright.
freezing U2001 cures it for a while.
CURE: the 9V Y/V/C VCC is running 11V. The cure was to replace CR3065,
in the base circuit of the 9V regulator. This diode is behind a heat
sink, ad covered with hot glue; a real chore to get to.
I'm real glad to be finally sending this dog 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 TV wrote:
> I'll be careful. :-)
>
> 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."
>
>
> Wayne Vanaman wrote:
>
>>Well, the dog is likely to bite you when you try to spank it.
>>
>>Wayne Vanaman
>>Omega Electronics
>>6904 W Fairfield Dr
>>Pensacola, Fl. 32506-3310
>>
>>Wayne@xxxxxxxxxxxxxxxxxxxxx
>>WWW.PensacolaTVRepair.Com
>>
>>850-456-5995 voice
>>850-458-6369 fax
>>
>>
>>John @ Myers TV wrote:
>>
>>
>>>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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