[TechAssist] Re: Zenith25" - Model #Z25A11S/Main Module#9-1790 - Black Screen with audio and OSD
- From: Philip Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 16 May 2003 18:02:03 -0400
Just a thought: Unsolder and pull the tuner, then try video line in with
a VCR and see. Sometimes a defective tuner will load down the source
voltages and do these type of things.
Phil Bader
Don Cohen wrote:
>
> Hello,
>
> TV powers up showing in the upper right corner of screen a blue display that
> shows channel 2, the time, and MONO. Pressing a channel button changes the
> channel 2 line to VIDEO. If using cable, screen remains all black (except
> for the upper right display), and there is no audio (not even a snow sound).
> If I connect a VCR to the AV jackes, I can get proper audio, but video is
> still all black. Autoprogram detects no channels at all in cable or Air
> mode.
>
> I don't have a schematic for this chassis. Could someone give me the tuner
> pinouts, with voltages (they aren't silk-screened on bottem of board)?
> Assuming that data, clock, and voltages are OK, would these symptoms most
> likely indicate a bad tuner? I tested the video processor (ICX2200) in
> another set and it worked fine, so I don't think it could be that. Seems
> like that would only leave the EEPROM as another possibility, but I still
> think the tuner is the most likely culprit.
>
> Thanks,
> Don Cohen
> DC Electronics
> Shinglehouse, PA 16748
> (814) 697-7800
> bond007d@xxxxxxxxxxx
>
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--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
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- » [TechAssist] Re: Zenith25" - Model #Z25A11S/Main Module#9-1790 - Black Screen with audio and OSD
