[TechAssist] Re: Electrohome 33CJ11, dark picture,picture tube is good
- From: Kevin <kevintv@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 04 Jun 2003 15:28:33 -0700
Yes, video is present at the base of each transistor, and the Y
component as well. Yes the collectors for the transistors are 220
volts. Screen voltage is 417 volts and when I increase it, all I get is
a muddy picture with retrace lines. Onscreen display is working fine.
Customer said picture went dark over a period of days. Almost sounds
like a cap is failing slowly. Tony, I checked C213 and it tests good
for ESR.
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of al m
Sent: Wednesday, June 04, 2003 3:36 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Electrohome 33CJ11, dark picture, picture tube
is good
Put your scope on the base of each transistor and see if the video is
there.
Are you saying that the collectors of the Transistors is 220V?
Doesn't need to be the jungle IC as I had that problem before and it
turned
out to be a video mute transistor for the on screen display. if your
collector voltage is right , check your screen voltage. Maybe leaky cap
on
that line.
al marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "George" <grndmstrg@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, June 04, 2003 5:00 AM
Subject: [TechAssist] Re: Electrohome 33CJ11, dark picture, picture tube
is
good
> Kevin,
>
> Look for a common resistor to the three color amps that has gone up
in
> value causing a high bias on the CRT. You can verify this by loading
down
> each CRT cathode pin to ground through a 100k ohm or so resistor
> momentarily. Should lighten up the screen color of the pin you're on
as
you
> move the resistor. I do not like the method of not limiting the
current
(not
> using a resistor suggested by others). HTH
>
> George
> Afana Electronics
> Moreno Valley, CA
>
> ----- Original Message -----
> From: "Kevin" <kevintv@xxxxxxx>
> To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, June 04, 2003 1:11 AM
> Subject: [TechAssist] Electrohome 33CJ11, dark picture, picture tube
is
good
>
>
> > This 14" TV has a very dark picture. Picture tube tests excellent.
Each
> > of the color gun reads 220 volts which is too high, and each gun's
> > transistor doesn't even get warm. Obviously each of the 3
transistors
> > is not being turned on by the signal coming in. I find these
repairs
> > difficult as I don't really know what is going on in the circuit. I
am
> > suspecting the video jungle from which the R-Y, B-Y, G-Y, and Y
signals
> > originate. Does it sound like the Y signal is missing? By the way
the
> > base and emitter of each transistor have 5.3-5.6 volts on them. TIA
> >
> > Kevin Wilks
> > Kevin's TV & Video Repair
> > Penticton BC Canada
> > kevintv@xxxxxxx
> >
> >
>
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