Mitsubishi VS-4003R ProJo Dead Set Issue

[Jim]

Hey Group:
Got this ProJo in the shop that was supposed to have taken some kind of
surge. Totally D.O.A.. Been through the P/S (Replaced Reg's. and
caps.). Gone through
the Deflection Module. Replaced several parts that checked OK (Like the
H.O.T.,
etc.). Appear that I now have all the Stand By voltages, but unit still
won't power
up. Removed the Flyback and rang it - seems to check OK, however I know
that's
no guarantee. Since I don't have Schem. on this unit I was hoping that
perhaps some
one may know something about this 1993-1995 unit that I'm overlooking,
or, hopefully there is someone out there that knows "Mit's" enough to
make some
suggestions.
T.I.A.
Jim

 

[Asimov]

"Jim" bravely wrote to "All" (11 Oct 05 17:44:22)
--- on the heady topic of "Mitsubishi VS-4003R ProJo Dead Set Issue"

Ji> From: Jim <[email protected]>
Ji> Xref: core-easynews sci.electronics.repair:344802

Ji> Hey Group:
Ji> Got this ProJo in the shop that was supposed to have taken some kind
Ji> of surge. Totally D.O.A.. Been through the P/S (Replaced Reg's. and
Ji> caps.). Gone through
Ji> the Deflection Module. Replaced several parts that checked OK (Like
Ji> the H.O.T.,
Ji> etc.). Appear that I now have all the Stand By voltages, but unit
Ji> still won't power
Ji> up. Removed the Flyback and rang it - seems to check OK, however I
Ji> know that's
Ji> no guarantee. Since I don't have Schem. on this unit I was hoping that
Ji> perhaps some
Ji> one may know something about this 1993-1995 unit that I'm overlooking,
Ji> or, hopefully there is someone out there that knows "Mit's" enough to
Ji> make some
Ji> suggestions.
Ji> T.I.A.
Ji> Jim


Could be a dead transistor switch or cpu line for the turn-on circuit.
Is there any sign of activity at that cpu line? Cpu brain dead?

A*s*i*m*o*v

.... First Church of Binary Science (The Digitarians)