[TechAssist] Re: RCA TV chasis CTC185AB
- From: "ktaylor" <kntaylor@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 28 May 2002 20:56:07 -0400
Hi Tomlee.
Before You change the flyback check the waveform at the drain of Q4114.
If it has a spike of about 290 voltspp that is what's causing it to fail. A
few of the components to cause this are C4136, R4126 and C4103 . Also check
the bias voltages, even a small change will make a difference.
Ken Taylor
Zap electronics
kntaylor@xxxxxxxxxxxxxx
----- Original Message -----
From: "Tomlee" <t8872695@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, May 28, 2002 7:50 PM
Subject: [TechAssist] RCA TV chasis CTC185AB
>
> Hello Group.
> I am working with a return TV chasis CTC 185AB. First time The unit is
dead.
> Change Q4114, with components of power supply kit. customer took it then
> bring it back
> after one month. This time it can not turn on. It has B+.
> I feed horizontal driver then instantly HOT blown,fuse
> blown, off course Q4114 blown.I ring the primary flyback
> It is good . I ring horizontal yoke .It is good.I will order a fly back
for
> replacement. But my question is If there is a short in secondary flyback
can
> make this high curent?Is there any section I must check for this HOT
> killer.I did remove crt board off when turn the tv on .but no on.
> Dang TIA
> TD electronics
> 18546 sherman way
> reseda, ca 91335
>
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