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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

Rear Projection TV convergence



 
 
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  #1  
Old August 16th 05, 12:39 AM
Kelly Ray
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Default Rear Projection TV convergence

hi guys, i'm sure this has been covered somewhere before but i have a couple
of big screen 50" Mitsub. TVs with bad colors and convergence installed in
some arcade games! i know how to adj a normal CRT tube convergence with
rings but no idea on projection. i heard this is a bitch to do, is it?
is there a capkit/repair that you can do with these? is there a website to
follow directions on this procedure?

thanks and sorry for the ignorance,
Kelly


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  #2  
Old August 16th 05, 06:07 AM
Jumpster Jiver
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Default

Kelly Ray wrote:
hi guys, i'm sure this has been covered somewhere before but i have a couple
of big screen 50" Mitsub. TVs with bad colors and convergence installed in
some arcade games! i know how to adj a normal CRT tube convergence with
rings but no idea on projection. i heard this is a bitch to do, is it?
is there a capkit/repair that you can do with these? is there a website to
follow directions on this procedure?

thanks and sorry for the ignorance,
Kelly


That depends... It is normal for a rear projection TV or monitor to
slowly drift slightly out of convergence as the CRTs age. If any sudden
drastic change has happened the there has been a component failure on
the convergence board. Usually it's the large ICs and maybe some caps
and low wattage resistors as well.
If the TV has just slightly drifted, there should be a large amount of
controls on the convergence board which can be adjusted, or it may be
done through the menu, depending on the model.
If it's done by controls, most manufacturers attach a long extension
cable to the convergence control board so you can stand far back from
the screen while adjusting all the controls.
  #3  
Old August 16th 05, 09:32 AM
[email protected]
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Default

Kelly Ray wrote:
hi guys, i'm sure this has been covered somewhere before but i have a couple
of big screen 50" Mitsub. TVs with bad colors and convergence installed in
some arcade games!


Hi Kelly,

Some of the older units have a slide out convergence PCB with a load of
pots. These are a real PIA but after a bit of practice you can get good
results. The more modern units use a remote control (usually lost by
the arcade center) that you use to converge. What ever you do never
reset the storage data (some have no warning) as it will take ages to
re-align the screen all square again.

What chassis and games do you have? I have access to most Mitsubishi
and Toshiba service info.

Wes.

  #4  
Old August 16th 05, 08:35 PM
Kelly Ray
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Default

thanks Wes, i will look up model #'s tonight! i have 3 games with 50
inchers in them.....Virtua Cop, Alpine Racer, and a Time Crisis.

i don't remember seeing any satelite/remote board hanging around but will
check again. all these came out in mid 90's(94-96 i believe)!

thanks for the posts,

Kelly

wrote in message
ups.com...
Kelly Ray wrote:
hi guys, i'm sure this has been covered somewhere before but i have a
couple
of big screen 50" Mitsub. TVs with bad colors and convergence installed
in
some arcade games!


Hi Kelly,

Some of the older units have a slide out convergence PCB with a load of
pots. These are a real PIA but after a bit of practice you can get good
results. The more modern units use a remote control (usually lost by
the arcade center) that you use to converge. What ever you do never
reset the storage data (some have no warning) as it will take ages to
re-align the screen all square again.

What chassis and games do you have? I have access to most Mitsubishi
and Toshiba service info.

Wes.



  #5  
Old August 16th 05, 09:56 PM
Tom MacIntyre
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Default

On Mon, 15 Aug 2005 18:39:16 -0500, "Kelly Ray"
wrote:

hi guys, i'm sure this has been covered somewhere before but i have a couple
of big screen 50" Mitsub. TVs with bad colors and convergence installed in
some arcade games! i know how to adj a normal CRT tube convergence with
rings but no idea on projection. i heard this is a bitch to do, is it?
is there a capkit/repair that you can do with these? is there a website to
follow directions on this procedure?

thanks and sorry for the ignorance,
Kelly


If it's pots it takes practice...with the remote, once you get the
idea what is being asked of you, it can be a fairly smooth ride. JVC
even offered customer convergence adjustments in their sets a few
years back. Good luck.

Tom
 




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