[TechAssist] Re: Electrohome 33CJ11, dark picture,picture tube is good. FIXED
- From: Kevin <kevintv@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 05 Jun 2003 00:07:33 -0700
C213, 10uF @ 50 volts, was the culprit. In circuit it tested fine for
ESR and out of circuit it measured 12-15uF. It also had that fishy
smell when I heated it up. I would never have thought to change it
except for Tony's tip. I changed it just to eliminate it as a possible
cause for my dark picture. If all tests fail, just change it! Thanks
to Tony (TTT). =20
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx=20
=20
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Darryl A. Widman
Sent: Wednesday, June 04, 2003 5:30 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Electrohome 33CJ11, dark picture, picture tube
is good
Hi Kevin,
Check to see if there is a video amp transistor on the crt board that
might be defective. It would probably be a PNP device. That could bias
the three output transistors resulting in cutoff (high collector
voltages) leading to high cathode voltages.
Darryl Widman, CET CA-52
Television City
POBox 50138
Santa Barbara, CA 93150
805-969-2326
auditron@xxxxxxxx
On Wed, 04 Jun 2003 01:11:47 -0700 Kevin <kevintv@xxxxxxx> writes:
> This 14=94 TV has a very dark picture. Picture tube tests excellent. =20
> Each
> of the color gun reads 220 volts which is too high, and each gun=92s
> transistor doesn=92t even get warm. Obviously each of the 3=20
> transistors
> is not being turned on by the signal coming in. I find these=20
> repairs
> difficult as I don=92t 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=20
> signals
> originate. Does it sound like the Y signal is missing? By the way=20
> the
> base and emitter of each transistor have 5.3-5.6 volts on them. TIA
> =20
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
> =20
>
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>=20
>=20
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