[TechAssist] Re: RCA F35675MB CTC187CL3 "Smokes" C4105,C4107
- From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 30 Jan 2003 08:28:35 -0600
There is an SMD cap off of pin three which I have seen bad on a couple of
units. The end caps crack. This cap is on the feedback line.
Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Pensacola, Fl. 32506-3310
Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com
850-456-5995 voice
850-458-6369 fax
----- Original Message -----
From: "kenneth gardner" <kgardner2@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, January 29, 2003 10:18 PM
Subject: [TechAssist] Re: RCA F35675MB CTC187CL3 "Smokes" C4105,C4107
>
> These parts are blowing up because your set has no voltage feedback to
> control stk730-xxx.I fixed a problem like this about 8 years ago only one
> I've ever seen. I found cracked land close to one pin of the switch mode
> power xformer I think it was pin 7. Anyway its the one used for feed back.
> Hope this helps.
> Ken Gardner Larson TV Houston TX
> ----- Original Message -----
> From: "Jim Bailey" <baileystv@xxxxxxxxxxxx>
> To: "TechAssist" <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, January 29, 2003 3:59 PM
> Subject: [TechAssist] RCA F35675MB CTC187CL3 "Smokes" C4105,C4107
>
>
> >
> > Hi Techs,
> > MODEL: F35675MB
> > CHASSIS: CTC187CL3
> > PROBLEM: Smokes the 10uf/200v & 100uf/250 Filter as soon as the ac is
> > pluged into the wall outlet, first it will smoke the 10uf first replace
it
> > then 100uf smokes,
> > I have replaced cr4106 diode and the STK730-150 REG. and xformer IHVT.
> > WE Isolated the 140v lines by unsoldering pin 3 of xformer and
connection
> to
> > the driver transformer and replaced filters and STK730-150 Reg and they
> > still smoked.I havent found anything in the smps bad also have taken
> > resistance measurements to ground no problems yet.Parts are blowing
before
> I
> > can get any kind of measurments I changed the U4102 12V STBY REG no
change
> > if anybody has a tip or suggestion on how to isolate the load so I can
> make
> > volt. test on reg before it blows would be appreciated.
> > P.S I have went through 3 sets of parts on this dog!
> >
> > Jim Bailey
> > Bailey's TV Sales & Service
> > Buckhannon, WV 26201
> > baileystv@xxxxxxxxxxxx
> >
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