Mitsubishi VS-50703 does not turn on

[chaseme5]

I have owned this set since 1998. I had the power supply replaced last
year. The set was working great. I watched a movie the other night with no
problems. The next day, the tv would not turn on! This is what happens,
you turn the tv on, the green light comes on and immedaitely the green
light turns off. No Picture, no sound. If I unplug the power recepticle
from the wall and then plug it back in, there is a spark between the
polorized plug and the electrical outlet. This happens when the tv is not
even on! Has someone ever ran into this problem before. Are repair manuals
avaiable for the Vs-50703? Any info on this matter I would appreciate!
Aaron

 

[Jerry G.]

You may still be able to order the service manual from Mitsubishi. You would
have to call their parts department to find out.

It sounds like there is a failure in the main power supply, scan protection
area, and or the horizontal output stage, or in the microcontroler circuit
area. Most of the time, it is the power supply and or the scan amplifier
sections that give these types of failures.

You would have to get the service manual, and follow it up with a DVM and
scope to trace out what is going on.

If you are not experienced in TV servicing, and not properly equipped, you
should give the set out to have a proper estimate. From this you would be
able to make an intelligent decision, if the set is worth it or not to
service it. Considering the age of the set, I would be shopping for a new
one.

--

Jerry G.
=====

I have owned this set since 1998. I had the power supply replaced last
year. The set was working great. I watched a movie the other night with no
problems. The next day, the tv would not turn on! This is what happens,
you turn the tv on, the green light comes on and immedaitely the green
light turns off. No Picture, no sound. If I unplug the power recepticle
from the wall and then plug it back in, there is a spark between the
polorized plug and the electrical outlet. This happens when the tv is not
even on! Has someone ever ran into this problem before. Are repair manuals
avaiable for the Vs-50703? Any info on this matter I would appreciate!
Aaron

 

[Art]

BTW, Almost every tele has a standby power circuit that is powered on when
plugged into the mains, therefore a small spark when plugging the cord into
the outlet is normal.

 

[John Del]

Subject: Mitsubishi VS-50703 does not turn on

From: "chaseme5" [email protected]
Date: 1/29/05 7:50 PM Eastern Standard Time

Are repair manuals

avaiable for the Vs-50703? Any info on this matter I would appreciate!
Aaron

The manual is probably discontinued, but I doubt it would help you. The
service manual is not a "how to" repair guide. You would need many years of
training and practical knowledge to make any use of it.

 

[chaseme5]

I was looking as the main board if the mitsubishi VS 50703 and noticed that
I saw clear fluid on the board. An aluminium heat sink is corroiding due
to the fluid. Is this what happens when a eletrolitic cap fails, they leak
fulid? Can this damage other parts.

 

[bubbajim]

ent.com:

I was looking as the main board if the mitsubishi VS 50703 and noticed
that I saw clear fluid on the board. An aluminium heat sink is
corroiding due to the fluid. Is this what happens when a eletrolitic
cap fails, they leak fulid? Can this damage other parts.

A tube has leaked glycol onto the deflection (?) module...personally I
would estimate the module as well as the afflicted leaky tube and about
$300 labor...ya gotta remove ALL the crt's and the associated mounting
bracket because of the convoluted way that Mits mounts their crt's.

 

[Leonard Caillouet]

It is NOT necessary to remove all three tubes. I just changed one two days
ago and it was very easy. Four screws, pull the yokes and the VM coils and
it is out. You may be thinking of one of the earlier sets with a lot of
extra shielding around the tube bulkhead. Mitsubishi tubes have been very
easy to change for years now. We rarely have to change one, however, except
for coolant leaks.

Leaks on the deflection board are easy to fix...single layer board, large
scale circuit. Leaks on the signal board are not so simple and often not
repairable on these sets.

Leonard

ent.com:


A tube has leaked glycol onto the deflection (?) module...personally I
would estimate the module as well as the afflicted leaky tube and about
$300 labor...ya gotta remove ALL the crt's and the associated mounting
bracket because of the convoluted way that Mits mounts their crt's.

=----

 

[chaseme5]

Exactly, A tube has leaked glycol onto the deflection (?) module. How did
you figure this out? I call a shop and they quted me $ 800.00 due to the
corrosion on the board and said a 3 day job at $60/hr. Would give me a
discount. @ $800.00

 

[chaseme5]

Exactly, A tube has leaked glycol onto the deflection (?) module. How did
you figure this out? I call a shop and they quted me $ 800.00 due to the
corrosion on the board and said a 3 day job at $60/hr. Would give me a
discount. @ $800.00