[TechAssist] Re: RCA F32632SB, CTC187CN3 dead.STL730 shorted,other,now blows C4107

  • From: peggs <peggs@xxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx, <techassist@xxxxxxxxxxxxx>
  • Date: Mon, 25 Aug 2003 11:23:55 -0700

c4105.....or filter on HOT B+ line also

Peggs

At 09:13 AM 8/25/03, tvservice@xxxxxxxxxxxxx wrote:
>Normally when cr4106 fails it takes out the stk and line fuse, nothing else
>check for open 100 or 110  ohm resistor off pin1 of stk also be certain all
>legs of stk are thru holes an soldered
>Robert
>tvservice@xxxxxxxxxxxxx
>H & H Electronics Inc
>Dallas, TX
>----- Original Message -----
>From: "Philip Bader" <tjanphyl@xxxxxxxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Monday, August 25, 2003 10:51 AM
>Subject: [TechAssist] RCA F32632SB, CTC187CN3 dead.STL730 shorted,other,now
>blows C4107
>
>
> > Came in dead. Measured short across HOT collector. I do a "kit" with
> > these when STK or HOT shows short.
> > Ordered and installed:
> > HOT Q4401 223942
> > C4402 206008
> > CR4402 242907
> > CR4403 243636
> > U4101 STK730-150, used OEM 223948
> > Fly T4401 223952
> > After installing above,I noted:
> >  Orig. HOT was OK. (short was measured across it in circuit),
> > and  I also did find  a diode CR4106 shorted, so replaced that,too.
> > NOW:
> >  Plugged set in,heard a raspy buzz from the SMPS. Located ,replaced
> > C4127 (10MFD/63V,low value, read 7mfd) in smps area.
> > Now rasp gone,but plugged in and "Hisssssss-POW!" the 100MFD/250 cap
> > (C4107, or 107K) blew apart! Checked diode going to it, OK.New. Replaced
> > with another cap,gets hot in seconds,would blow.
> > Originally this cap was OK in the set. I cannot figure if I injected
> > something,or what. Is the SMPS runnung away?
> > Need input here.
> > I suspect the orig. failed parts were the CR106 I found shorted and the
> > STK in the smps.
> > Why is this big 100MFD C4107 cap blowing???
> > Help.
> > Phil Bader
> > --
> > Philip Bader
> > Jan Phyl TV Inc. (estab. 1976)
> > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > Fax (863) 299-8821
> > email: tjanphyl@xxxxxxxxxxxxxxx
> > For Professional Technicians Only
> >
> >
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