[TechAssist] Re: [Fwd: Sony PTV KPR-53EX35 (Aug.91) intermitt. shut down then black screen.fix]
- From: Ralph Dorsey <Merlin-Wizard@xxxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 18 Oct 2001 23:01:35 -0500
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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