[TechAssist] RCA M# P52955; turns on for 1 sec, then shuts off
- From: "John @ Myers TV" <myerstv@xxxxxxxx>
- To: "Tech-assist" <techassist@xxxxxxxxxxxxx>
- Date: Wed, 22 Oct 2003 10:15:33 -0400
Hi everyone,
We have a cold one here in NE Ohio, today. They are actually forcasting snow
showers for this evening!
Anyway, here's what I have: an RCA Projection, M# P52955 (Chassis #
PTK195W1B).
When we go to turn this on, the high voltage comes up, then down after 1
second. What is happening is that the RUN/STBY line from the micro is going
low, about 1 second after turn on. This turns off the deflection circuits,
etc.
When this happens, the VCC lines, + the reset on the micro remain stable.
I've unplugged the TV Guide module; the problem remains.
This was a lightning strike. I'm leaning towards changing the micro, the
EEPROM, and U14701 (regulator).
The only thing I've found that is unusual it the main B+ supply; It measures
+170V in standby, ans +145.2V in Run. I don't know if this is normal, since
those values aren't given in the service manual (or I can't find them).
I'm hoping that someone can give me some ideas on this, or point me in the
right direction.
John Myers
Myers TV Service Co. Since 1984
Alliance, OH
Voice: 330-821-6545
myerstv@xxxxxxxx
http://members.ebay.com/aboutme/tvguy07/
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