[TechAssist] Re: [Fwd: Sony PTV KPR-53EX35 (Aug.91) intermitt. shut down then black screen.fix]
- From: "Robert Herring" <supertek66@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 19 Oct 2001 08:40:27 -0500
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
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>
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>
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