Check R4128 and R4105 in the error amp circuit at U4101. Open can cause B+ increase. Leonard G. Caillouet Electronics World Gainesville, FL 352-332-5608 352-332-5668 (fax) ----- Original Message ----- From: "Philip Bader" <tjanphyl@xxxxxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Monday, August 25, 2003 11:51 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 > > **************************************************************************** * > Classifieds! Buy or Sell! > http://sell.tech-assist.org > The Tech Address Book: > http://www.tech-assist.org/secure/tip/contact.htm > Add a Repair Tip Here, or Change/Remove your Email Address: > http://www.tech-assist.org/secure/tip/main.htm > Lost Password: > http://www.tech-assist.org and select "Lost your Login Info?". > Email Archives: > //www.freelists.org/archives/techassist/ > ***************************************************************************** Classifieds! Buy or Sell! http://sell.tech-assist.org The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.htm Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.htm Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: //www.freelists.org/archives/techassist/