[TechAssist] Re: Mitsubishi 50" Projection TV Mod.VS50607
- From: "becyn" <becyn@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 16 Apr 2004 19:32:36 -0400
Wow! that description sounds like you ran deep into the woods before you
took a compas reading! LOL
Let's step back and look at the big picture.
1) Is the HV block OK?
2) Is the V deflection OK?
NOTE: It is NOT a good idea to force a projo on. If the V defl is bad, you
can burn all three tubes in a heartbeat(cringing) unless you take measures
to prevent it.
Jim McVey
McVey Alltronix
327 Broadway
Newburgh Ny 12550
ph: 845 561 8383
fx: 845 561 9017
Consumer electronics &
computer service.
Factory authorized for
over twenty brands.
----- Original Message -----
From: <majorthom@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, April 15, 2004 10:13 PM
Subject: [TechAssist] Mitsubishi 50" Projection TV Mod.VS50607
> Hi Guys -I hate to ask for help:I try to be independent BUT I've worked a
couple of days on this and the customer I'm sure would like it back.so:IC700
is the control uproc and the set energizes then shuts down.I get momentary
HV and Horiz. Sweep and when I key on relay these stay OK.Now examining the
hold-up voltages at pins 46 and 47 of IC700 ,they are wrong .I relieved pin
47 of the problem by lifting pins 1and 7 of the OP-AMP IC502.I cannot get
the DC supply sensing on pin 46 to give me +5VDC[remember the SMPS is going
in Standby].I have lifted D511,D979,D973 and opened the coll. of Q533 and
cannot get pin 46 to give the hold-up voltage of +5VDC.When I pull connector
KB the multipin ribbon between the signal and the defl. Bd ,Pin 47 goes up
to hold-up level.I'm wearying of this task and would appreciate a
hand.Regards,
> Pete
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> Peter Neal
> Neal Electronics
> 1905 E. Wm.Cannon
> Austin,TX 78756
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