[TechAssist] FIXED Philips PC6220 C121 Ch 20U6 Channel One set, shuts down
- From: Bill Boyd <billstvs@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 22 Jan 2003 17:24:32 -0600
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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