[TechAssist] Re: RCA CTC195 Standby supplies high; shutdown
- From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 30 Sep 2003 14:55:31 -0500
Probably a bad flyback, 250694, drawing number (on the part) is 1541938a
The power supplies voltage in standby is not too important.
If you can, scope the HOT collector, if not a secondary. I think you will
see ringing.
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
----- Original Message -----
From: "John @ Myers TV" <myerstv@xxxxxxxx>
To: "Tech-assist" <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, September 30, 2003 12:38 PM
Subject: [TechAssist] RCA CTC195 Standby supplies high; shutdown
> Hi,
>
> I thibnk this is a lightning strike. Here's the info
>
> M# P52955
> Chassis # PTK195W1B
>
> Problem: High voltage comes up, then down after about 1-2 seconds.
>
> Main power supply measures 168 - 175V in standby mode. VCC on the PWM
> controller chip is 12 V in standby (should be 10.2V ). Voltage at FB opin
of
> the controller is right on the money; 0.4V.
>
> It looks like a problem in the feedback path (CR14102, C14147, etc.).
> Everything checks OK.
>
> Opinions?
>
> John Myers
> Myers TV Service Co. Since 1984
> Alliance, OH
> Voice: 330-821-6545
> myerstv@xxxxxxxx
> http://members.ebay.com/aboutme/tvguy07/
> http://members.ebay.com/aboutme/threads_r_us/
>
>
>
>
>
>
>
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