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

  • From: <tvservice@xxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Mon, 25 Aug 2003 11:13:06 -0500

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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