[TechAssist] Re: Zenith B25A10Z (white raster)
- From: tvdoctors@xxxxxxxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: 09 Feb 2002 11:09:08 -0800
I have found video amp transistor bad in theses units that causes this problem.
> ** Original Subject: RE: [TechAssist] Re: Zenith B25A10Z (white raster)
> ** Original Sender: "Damon" <DAMON101@xxxxxxxxxxxxxx>
> ** Original Date: Sat, 9 Feb 2002 13:05:16 -0500 (EST)
> ** Original Message follows...
>
> Let's isolate this problem:
> Check your cathode voltage on all 3 collectors of your crt output
> transistors
> Check your screen voltage
>
> Screen voltage should be 200 to 400 volts, normally abut 250-300 is ideal
> Cathode voltages should read 140 to 170 volts ideally.
>
> Since you have no sound/no video the video jungle is likely the cause, but
> we may have a problem in the IF/video detector/sound detector section just
> before the video jungle.
> Let's make sure the CRT voltages are what they're supposed to be first.
> Then we'll take a look at the IF/Switching/Video/Sound subsystems next.
>
> Damon Brunger
> damon101@xxxxxxxxxxxxxx
> Telrad Electronic Services
> Ft Wayne, IN 46815
> ----- Original Message -----From: <javiles929@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, February 07, 2002 8:51 PM
> Subject: [TechAssist] Zenith B25A10Z (white raster)
>
>
> > Fellas after struggling for a month and half on this zenith i finaly got
> it
> > to life. But all i get is just the raster with no video and no sound. I
> have
> > check all of the transistors and diode with my tester and they all test
> good.
> > I remove the tuner to see if i least get a snowy picture with sound but
> same
> > white raster. Any ideas where i should go now. I only get 200V on the
> > collector of the HOT and 75V on E and B. your help is appreciated.
> >
> > Thanks in advance.
> >
> > Aviles Computer & Tv Repairs
> > Bronx, NY 10452
> > Fax 1-718-681-3117
> >
> >
> >
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>
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>** --------- End Original Message ----------- **
>
TV Doctors 108 W. Main St. Monroe,Wa. 98272 360-794-6469
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