[TechAssist] Re: Mitsubishi VS4507R weird vertical problem
- From: "Shoreline Electronics" <jstielau@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 17 May 2002 08:03:37 -0400
Jorge,
These caps may make the difference!
C2046, C2048 and C2A04 in Y-AMP on video circuit board
C5002 10uf/50v . Located On Front Edge Of Deflection Pcb
C 281 Off Of Pin 2 Of Ic202 100@16v
Also make sure you pull the power supply board and change C920 and other dry
caps.
Jeff Stielau
Shoreline Electronics Repair
125 Beech Tree Lane
Westbrook, CT 06498
860-399-1861
860-664-3535 (fax)
jstielau@xxxxxxxx
----- Original Message -----
From: "Jorge Camboni" <geo@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, May 17, 2002 4:37 AM
Subject: [TechAssist] Mitsubishi VS4507R weird vertical problem
>
>
> Hi fellows, need your help on a Mitsubishi rear projection set, VS4507R
> model, it has a very weird vertical problem:
> a couple of inches wide very dark horizontal stripe, almost at the top,
> crossed by a few white, retrace-like
> lines, and that pattern is SUPERIMPOSED to the picture, which can be seen
> faintly in the background.
> also the vertical amplitude decreased just a little (top).After a few
> minutes, the
> vertical amplitude decreases some more inches, and power goes off.This is
a
> very technician unfriendly set,
> had to work with it at the customer's house, I managed to get the boards
> out and change all the
> bad and suspicious caps in the vertical section, (found a couple almost
> dry) and one dead
> cap in the power supply, checked all around the jungle IC, did a thorough
> resoldering and cleaning
> on the boards. All this job was not the most technical approach, but it is
> what you have
> to do first at the customer's place, and it was almost impossible to make
> serious measurements
> folded onto myself on the floor and struggling with a fierce cable-web
:o))
> I hoped for the best and failed....
> Found NO TIPS on this model. Service manual is out of question (gave them
a
> ridicously low estimate,
> hoping for usual LA7838 tale.. ), and to make a sad story worst, I can not
> bring this one
> to the workshop. SO...ANY HELP WILL BE SO MUCH APPRECIATED!!!!
>
> tnx in advance Jorge Camboni GY Electronics, Dallas (for so many years
> cx8bbh)
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