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

  • From: Philip Bader <tjanphyl@xxxxxxxxxxxxxxx>
  • To: "techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
  • Date: Mon, 25 Aug 2003 11:51:28 -0400

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
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