[TechAssist] Re: NEC TV CT-1901C -very low sound, need print of audio section [FIXED]
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 10 Sep 2003 17:22:17 -0400
I have the sound working on this old NEC TV. THanks to all the techs
with great suggestions to help.
The solution was to flip the channel PRESET button from "Preset"
position to "Normal" position. This set is working like brand new now.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
Gary McCartney wrote:
>
> This is an old 19" set made in 1985. The picture is excellent so the
> customer wants it repaired. There is very little audio output to the
> speakers and the volume control buttons do nothing. Audio input jacks
> produce the same result. I have used a signal tracer the best I can
> without a schematic and found that there is a very low output on the
> output pins of the audio output IC, AN7158 (IC 302). THe input pins of
> this IC don't seem to have any noticable signal on them. There is
> another IC nearby, AN5035 which is IC 301. I get a nice level of audio
> on some of the pins on this chip and on some of the surrounding
> circuitry. Still, I haven't found a place where the volume buttons raise
> or lower the sound level.
>
> I am thinking the sound maybe is lost in the circuitry that controls the
> volume. Does anyone have a print for this? I checked SAMS online index
> and didn't find listing.
>
> Thanks for any help.
>
> Gary
> --
>
> Gary McCartney
>
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
>
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