[TechAssist] Re: sony kv32s20
- From: tvdoctors@xxxxxxxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: 17 Oct 2001 14:47:28 -0800
Already tried running without horiz. output transistor in circuit, Still cuts
off. ( Pulse comes up then goes back down) I figured that this set might be
designed to go into shutdown if any of the secondary voltages had any problems.
> ** Original Subject: [TechAssist] Re: sony kv32s20
> ** Original Sender: "GJCHAMBERS" <gjchambers@xxxxxxxxxxx>
> ** Original Date: Wed, 17 Oct 2001 16:28:56 -0500 (EST)
> ** Original Message follows...
>
> Try unsoldering the horiz output transistor and monitor the drive signal at
> the base junction.
> if it looks good, be sure you have the sony orig h.o.t. installed.
> this will also tell you if power suply is running as well. be sure to look at
> the 135v as well.
> good luck,
> gary
> Gary Chambers
> Chambers T V
> Bradenton,Florida
> Since 1982
>
>
> PS, I can also see my secondary voltages start to run a well, but quickly
> shuts down. Neil
>
>
> > ** Original Subject: [TechAssist] Sony KV32S20
> > ** Original Sender: tvdoctors@xxxxxxxxxxxxx
> > ** Original Date: Wed, 17 Oct 2001 15:54:24 -0500 (EST)
>
> > ** Original Message follows...
>
> >
> > Set came into my shop dead. I found Q601 and Q602 shorted and R607 open in
> > the switch mode power supply. These were knocked out by a shorted H.O.T.
> > Q502. I replaced all these components and now set try's to come on but
> > won't . Pulse starts out up to base of Q502 but won't start up. The only
> > voltages that I can see that is not right on is my 9 volt supply that's
> > switched on in the power supply during start up. It measures 8.3 volts. Is
> > this chassis prone to having bad flybacks or is there something I am
> > missing? Any help would be greatly apreciated. Thank, Neil TV Doctors
> >
> >
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> >** --------- End Original Message ----------- **
>
> >
>
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