[TechAssist] Re: RCA F35675MB CTC187CL3 "Smokes" C4105,C4107
- From: "kenneth gardner" <kgardner2@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 29 Jan 2003 22:18:32 -0600
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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