[TechAssist] Re: FIXED Philips PC6220 C121 Ch 20U6 Channel One set, shuts down
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 23 Jan 2003 07:02:18 -0500
Good troubleshooting Bill!
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
----- Original Message -----
From: "Bill Boyd" <billstvs@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, January 22, 2003 6:24 PM
Subject: [TechAssist] FIXED Philips PC6220 C121 Ch 20U6 Channel One set,
shuts down
>
> B+and high voltage were normal so I lifted one end of R273 to disable shut
> down.
> Found Q540 one of the shutdown transistors shorted, still shut down with
> signal.
> Second time testing everything found Z564 15V zener diode (over beam
current
> protection circuit) checked good but zenered at a lower voltage.
> Replacing Q540 and Z564 restored normal operation.
>
> Bill
> Bill's TV Service
> Sulphur Springs, TX
>
> >From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Subject: [TechAssist] Re: Philips PC6220 C121 Ch 20U6 Channel One set,
> >shuts down
> >Date: Tue, 21 Jan 2003 13:41:11 -0500
> >
> >That sounds like it may be going into high voltage shutdown. What does
the
> >B+ measure? Do you have the option of switching to an A/V input?
> >
> >Bob Waterman, CET® #RI-28
> >Master Technician License #9109
> >Service Manager
> >Gemini Computer, TV, & Security Alarms
> >(508)695-7302
> >(508)695-7769 FAX
> >geminitv@xxxxxxxxxxxxxxxx
> >geminitv@xxxxxxx
> >
> >----- Original Message -----
> >From: "Bill Boyd" <billstvs@xxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Tuesday, January 21, 2003 11:52 AM
> >Subject: [TechAssist] Philips PC6220 C121 Ch 20U6 Channel One set, shuts
> >down
> >
> >
> > >
> > > Philips model PC6220 C121
> > > Chassis 20U6
> > > Commercial model used as a Channel One monitor
> > >
> > > First time working on one of these.
> > > Set came in with bright screen with retrace lines.
> > > Replaced open R562 and burnt R573.
> > > Now have normal screen with snow with no signal.
> > > OSD is normal.
> > > When I connect a signal or tune to an active channel it
> > > shuts down immediately.
> > > Is this normal without the Channel One receiver connected
> > > or do I have a problem?
> > > High voltage and B+ are normal. Shuts down with CRT socket
> > > disconnected. Tried with Channel One input card unplugged also.
> > >
> > > TIA
> > > Bill
> > > Bill's TV Service
> > > Sulphur Springs, TX
> > >
> > >
> > >
> > >
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