[TechAssist] Re: Mitsubishi VS50501A (VZ4 chassis) intermittently goes dark then back to normal
- From: "Leonard Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 29 Jan 2005 03:24:14 -0500
I would not recommend tasting as a test for coolant leakage. Ethylene
glycol is toxic and can cause heart and kidney problems. In the very small
amounts you are exposing yourself to it may not be a problem, but why
introduce toxins unnecessarily. We are exposed to enough already. IIRC the
federal guideline for the limit for drinking water is 7000 micrograms per
liter. It is broken down in the environment in a few days by common
bacteria, but who knows what happens in the body.
Leonard Caillouet
Electronics World
1261 NW 76 Blvd
Gainesville, FL 32606
352-332-5608
FAX 352-332-5668
----- Original Message -----
From: <damon101@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, January 28, 2005 10:28 PM
Subject: [TechAssist] Re: Mitsubishi VS50501A (VZ4 chassis) intermittently
goes dark then back to normal
Well first....I think I've measured about 220 on the 200V line, so don't
worry about that situation....Secondly, I have had 1 or 2 of those models
with coolant leakage. Thirdly, did you check the yoke plugs for cracks?? Or
is the picture still visible when it gets too dark?
I'd lean more towards coolant leakage problems, but if it's too bright to
begin with I think I'd do a white balance/sub bright adjustment 1st, and try
to get the bar to get it on the floor for a better coolant leakage checkout.
Now there is a way to check for coolant leaks if it's dry....Wet you finger
and rub it on the holes located on the down side of the CRT's bell
box....the one that surrounds the crt bell. Coolant normally leaks out of
those holes and if it's dry and you wet your finger etc....you can sometimes
pick up dry coolant. Then if you taste your finger......you should taste a
sweetness. That would indicate coolant has been there.
But the reality I've experienced with this model is....the only way to
verify it is to let the PTV run a couple hours, then visually inspect it,
then try the taste test at that time...
Damon Brunger
Telrad Electronics
Fort Wayne IN
----- Original Message -----
From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
To: "Techassist" <techassist@xxxxxxxxxxxxx>
Sent: Friday, January 28, 2005 4:08 PM
Subject: [TechAssist] Mitsubishi VS50501A (VZ4 chassis) intermittently goes
dark then back to normal
> I have a problem set at a local bar. The complaint is that the picture
goes
> dark intermittently and will go back to normal brightness. The set is up
on
> a shelf with little room to move it in a small corner that would be tough
to
> service even on the floor. The Super Bowl is around the corner and they
sure
> don't want me to remove it here in the heart of Patriots Nation. Of course
> they are hoping to have it repaired by the Super Bowl! I did make a
service
> call and did not observe it going dark, however, it did appear to be too
> bright (I suspect the transistors on the CRT boards). I was only able to
> remove the front cover to inspect the chassis and took a good look for any
> evidence of CRT coolant leakage and could not find even the smallest
trace.
> My 200 volt line was reading about 221 volts. I know there are those of
you
> with much more experience on these sets than myself. I found nothing
> relevant on the Mitsubishi website or in WINSTIPS. Unfortunately I can't
> give you more than this presently but I am hoping someone has some ideas
> given the circumstances under which I must work on it.
>
>
> Bob Waterman, CET® #RI-28
> Master Technician License #9109
> Service Manager / Parts Manager
> Gemini Computer, TV, & Security Alarms
> (508)695-7302
> (508)695-7769 FAX
> geminitv@xxxxxxxxxxx
>
>
>
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