[TechAssist] Re: Zenith IQB32B44
- From: "Shaun" <ssroark@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 26 Jan 2002 16:38:38 -0700
I also have seen some of these and the problem was a shorted diode off the
flyback usually the one going to the vertical section. Also in Zeniths
shorted vertical ic or tuner can cause this problem, but I learned the hard
way on the first one I thought it was the fly so I repalced it and still
same problem later found that shorted diode coming off the secondary of the
flyback.
Shaun
----- Original Message -----
From: "techforce" <techforce@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, January 26, 2002 6:59 AM
Subject: [TechAssist] Re: Zenith IQB32B44
>
> Could be A bad HOT? Are the Voltages on the Secondary of the SMPS jumping
> in sync with the Chirp?
> If so, try lifting the cathodes of all the Rectifier diodes off the
> Secondary of the SMPS Xfmr (if there is one) and leave them floatng.
>
> You ought to be able to power on the Set like that, then see if the
chirping
> changes. This will tell you if your problem is in the SMPS or beyond the
> SMPS. Seems to work for me when I do monitors, might be something you can
> try.
>
> Steve
> Technotronic Dimensions, NY (USA)
> www.100megspop2.com/techforce
> 1-877-817-9885
> ----- Original Message -----
> From: <tvdoctors@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, January 25, 2002 1:17 PM
> Subject: [TechAssist] Zenith IQB32B44
>
>
> > Fairly new 32" Zenith. No schematic. Turn unit on and all it does is
make
> a chirping noise for the Horizontal circuit. Osc. and Output of horiz.
> tries to come on as well as secondaries. Screen voltage supply seems to
not
> get over 130 volts when turned on. My B+ is 130 volts. Anyone run into
this
> problem before? Neil
> >
> > TV Doctors 108 W. Main St. Monroe,Wa. 98272 360-794-6469
> >
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