[TechAssist] Re: CTC197CE2, replaced flyback, noticed parts on CRT board in SVM circuit were damaged as well
- From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 10 Sep 2003 07:06:53 -0500
I suppose that a spike on the B+ could kill these transistors. (If the IHVT
failed that could happen.)
R15240 is 430ohms, 2W, and R15233 is 75ohms .25W. After that you (going
back to the base of q15212 is a 1000 ohm r15230 and some caps, which should
keep most spikes out of the rest of the circuit.
Q15212 is 227405 Q15213 is 227404.
As for disabling the SVM, unplug P15201 which connects the circuit to the
SVM coil.
As far as "bad qualities", some distortions are more acceptable to one group
of people while they are pickey about another kind of distortion.
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: "Kevin" <kevintv@xxxxxxx>
To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, September 10, 2003 2:00 AM
Subject: [TechAssist] CTC197CE2, replaced flyback, noticed parts on CRT
board in SVM circuit were damaged as well
> In the process of replacing the flyback of this 35" CTC197CE2, I noticed
> that 4 parts on the CRT board were damaged. R15240 and R15233 were
> burnt, and Q15212 and Q15213 are both shorted. Why did these parts get
> damaged? They appear to be connected to the B+ of 140 volts. They are
> called SVM transistors in the parts list for the chassis. I did a
> google search and found that SVM stands for "Scanning Velocity
> Modulation". Most comments said that the SVM has more bad qualities
> than good qualities. Is it possible to disable the SVM as the many
> emails on google suggested to do? Thanks.
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
>
>
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