[TechAssist] Re: [FIX] Mitsubishi VS55601, weak contrast and retrace lines.
- From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 25 Feb 2003 13:49:05 -0500
All transistors, resistors, diodes, etc on the three CRT boards were ok,
problem was an open 2.4K 1/4W R5A28 that was taken out by the flyback along
with C5A07. Pin 8 of the flyback should be at some positive voltage but was
at about negative 14 volts.
**************************************************
Jim Myers
Since 1972
Telrad Electronic Services Co.
Fort Wayne, IN 46815
*************************************************
----- Original Message -----
From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
To: "TechAssist" <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, February 25, 2003 8:24 AM
Subject: [TechAssist] Re: Mitsubishi VS55601, weak contrast and retrace
lines.
Jim,
I think I know which ones he's talking about,( another tech had lost a
picture, and replacing ONE and ONLY ONE of those transistors got video
signal to pass....but it didn't bring his picture back....at all). I think
the KEY to this problem, and that other tech's problems is to REPLACE ALL
those transistors.
It's likely, as those transistors are the biasing transistors off of the
Video Jungle, or that Blue enhancement-gamma-thingy IC just before going to
the CRT boards. Arcing IHVT, C5A07, Blanked picture, turn up screen and
video appears......sure points to the IK pulse feedback is incorrect, and
those transistors are right in line with the output side. I recall there are
actually 2 transistors for each color, one passes video, the other biases
the 1st one.
Of course, the transistors Most likely affected would actually be the CRT
output and drive transistors, since they are directly connected to the Crt
and offending IHVT......
Damon Brunger
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Shoreline Electronics" <jstielau@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, February 24, 2003 2:27 PM
Subject: [TechAssist] Re: Mitsubishi VS55601, weak contrast and retrace
lines.
>
> See if these will aply.........
>
> ---------------------------------------------------------------
> Text pasted from WinSTIPS 2.0
> http://www.ServiceSoftware.com
> ---------------------------------------------------------------
>
> MITSUBISHI VS55601
>
> Pix Washed Out With Excessive Brightness. Controls Have No Effect.
>
> Dan Mundy, Cet/Csm Vz4
>
> Replace All Trasnistors On Crt Boards. Q6?0, Q6?1 2sa1321, Q6?2 2sc3334.
> Bias Is Upset On Ik Line.
>
> ---------------------------------------------------------------
>
>
> ==========================
> Jeff Stielau
> Shoreline Electronics Repair
> 344 East Main Street
> Clinton,CT 06413
> 860-399-1861
> 860-664-3535 (fax)
> jstielau@xxxxxxxx
> ==========================
> "If you push something hard enough it will fall over."
> Fudd's First Law of Opposition - Sir Sidney Fudd
>
>
> ----- Original Message -----
> From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
> To: "TechAssist" <techassist@xxxxxxxxxxxxx>
> Sent: Monday, February 24, 2003 12:38 PM
> Subject: [TechAssist] Mitsubishi VS55601, weak contrast and retrace lines.
>
>
> >
> > Working on a Mits VS55601 which had a bad flyback and C5A07 blown apart.
> > After replacing the fly and cap set works but has weak contrast with
> retrace
> > lines, all three colors look the same. Replaced IC200, CXA2095S which
did
> > not help. The contrast and brightness controls seem to have minimal
> effect.
> > Does anyone have an idea on this problem?
> > **************************************************
> > Jim Myers
> > Since 1972
> > Telrad Electronic Services Co.
> > Fort Wayne, IN 46815
> > *************************************************
> >
> >
>
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> >
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