[TechAssist] Re: Electrohome 33CJ11, dark picture, picture tube is good

  • From: "George" <grndmstrg@xxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Wed, 4 Jun 2003 02:00:54 -0700

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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