[TechAssist] Re: Sony KV27TS20 Dim picture
- From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 17 May 2002 00:18:01 -0500
G2 and cathode voltages seem lower than normal on this set, is your B+ at
130v?? Have you pulled the crt board off and measured those voltages? What
is your heater voltage? Normally I get 6Vac on a digital multimeter, and
that's a pretty universal reading on most if not all CRTs. Don't know what a
scope actually sees, but a good guess would be 12-15Vpp on the heater. It
sounds like your IHVT just isn't getting enough input power from the
regulator, or you have something pulling down your IHVT output voltages. I
believe your vertical
source(s) also come off the IHVT, either a +28V or a +15 and -15 supply
system.
Damon Brunger
damon101@xxxxxxxxxxxxxx
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Bill S" <billans@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, May 16, 2002 8:06 PM
Subject: [TechAssist] Sony KV27TS20 Dim picture
>
> Hi
> This unit came in not knowing what was wrong with it. We hooked it up and
> saw that it was a dim picture. Neither the picture or brightness control
> seem to have a lot of effect. The voltages on the G2 is 200 volts and can
> be varied. G1 is about 28 volts. The cathodes are about 130 some volts.
> Adjusting the screen control does not seem to make a lot of difference
> either. The picture tube seems to check good. The sub brightness control
> has only 5 volts on it. Is that the correct voltage for it. Is this one
of
> those sony's that have a video driver IC that is no longer available? Any
> other thoughts?
> Thanks
> Bill Sorensen
> New Life Video & Audio
> billans@xxxxxxxxxxxx
> - - - - - - - - - - - - - - - - - - -
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