[TechAssist] Re: [Fwd: Sony PTV KPR-53EX35 (Aug.91) intermitt. shut down then black screen.fix]
- From: <DAMON101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 19 Oct 2001 20:00:49 -0500
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.
> > > Help make your TechAssist online repair tips
> > > database better! Submit your fixes here:
> > > http://www.circuitwork.com/techassist/tip/#tips
> > > To unsubscribe write to:
> > > techassist-request@xxxxxxxxxxxxx
> > > with unsubscribe in the subject line.
> >
> > Help make your TechAssist online repair tips
> > database better! Submit your fixes here:
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> > To unsubscribe write to:
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> > with unsubscribe in the subject line.
> >
> Help make your TechAssist online repair tips
> database better! Submit your fixes here:
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>
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