[TechAssist] Re: [Fwd: Sony PTV KPR-53EX35 (Aug.91) intermitt. shut down then black screen.fix]
- From: Phil Bader <philbad@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 20 Oct 2001 12:18:23 -0400
This model does not use the "STK" convergence IC's, but I will note your
fix in my files.Thanks...Phil
DAMON101@xxxxxxxxxxxxxx wrote:
>
> Yeah I've seen a few of the Jungle Ics lose vertical drive or have just
> enough drive to keep the PTV from going into shutdown....2nd most common
> fault I've seen with the Convergence ICs causing the most Dead Set faults.
> First thing I always look at is the condition of the 2 fuses on the D board.
>
> Damon Brunger
> damon101@xxxxxxxxxxxxxx
> Telrad Electronic Services
> Ft Wayne, IN 46815
> ----- Original Message -----
> From: "Robert Herring" <supertek66@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, October 19, 2001 8:40 AM
> Subject: [TechAssist] Re: [Fwd: Sony PTV KPR-53EX35 (Aug.91) intermitt. shut
> down then black screen.fix]
>
> >
> > I had similar problem on KP53v25
> > the vertical drive was very low and distorted from the jungle chip. was
> > opening 2.2ohm1/8 watt resistor on -15 volt to vert output. replaced
> output
> > and resistor with no change, found jungle chip to be at fault replaced
> IC301
> > #875206350/cxa1477as
> > Robert
> > supertek66@xxxxxxxxxxx
> > robert_herring@xxxxxxxx
> > H&H Electronics Inc
> > Dallas,Tx. 75233
> > ----- Original Message -----
> > From: "Ralph Dorsey" <Merlin-Wizard@xxxxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, October 18, 2001 11:01 PM
> > Subject: [TechAssist] Re: [Fwd: Sony PTV KPR-53EX35 (Aug.91) intermitt.
> shut
> > down then black screen.fix]
> >
> >
> > >
> > > bravo,,finally someone that gets a fix and takes the time to give the
> > whole
> > > story from beginning to end. this is what we need more of
> > >
> > > Phil Bader wrote:
> > >
> > > > -------- Original Message --------
> > > > Subject: Sony PTV KPR-53EX35 (Aug.91) intermitt. shut down then black
> > > > screen.fix
> > > > Date: Thu, 18 Oct 2001 10:31:07 -0400
> > > > From: Phil Bader <philbad@xxxxxxxxxx>
> > > > Organization: Jan Phyl TV Inc. Winter Haven, Fl. Estab. 1976
> > > > To: "CONSUMERELREPAIR-L@xxxxxxxxxxxxxxxxxxxx"
> > > > <CONSUMERELREPAIR-L@xxxxxxxxxxxxxxxxxxxx>
> > > >
> > > > Customer said it would run all day,or hours,then shut down.Let cool
> and
> > > > ran another hour or so.Finally,no pix at all and no illumination on
> > > > screen.We noticed when on it had high voltage to CRT anodes,had
> filiment
> > > > glow in CRT necks,and the voltages from "G" power board were
> > > > there.Scoping the vert. output at plug D16 showed about 2 VPP
> waveform,
> > > > where there was supposed to be 100 VPP. So, we had HV with no
> > > > deflection.On a hunch, we ordered and replaced the "jungle chip" IC201
> > > > (CXA1012AS, # 875203171 @ $23.36 cost). Now we could advance the G2
> > > > controls and see illumination on the faces of the R,G,B CRTs (looking
> > > > down on them from inside). I noticed in the green CRT the word
> > > > "video".Now, changing input from "video" to "tuner" signal input
> > > > brought snow on all CRTs.Moved the unit,it shut down again.Further
> > > > inspection revealed the "G" power board had bad solder on some
> > > > components especially the two "dual-power diodes (3-legged) mounted on
> > > > heat sinks-very bad solder. Resoldering the "G" board cured the
> > > > intermittant condition that probably stressed and blew the jungle chip
> > > > IC201. Now, no sound most stations; Cause: was in SAP mode.Must have
> > > > remote to select.Now all is OK. So: Cure was replace IC201 and
> resolder
> > > > G board.
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> > >
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> > >
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> >
>
> Help make your TechAssist online repair tips
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