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392-570 Replacement
Mitsubishi convergence IC replacement: this applies to sets
that use (2) STK-392-570
The Idea here is to get the Middle Circuit board out so you
can replace the Convergence Ic’s.
HERE is what you will need: (most of this you can buy on the
internet or at local electronics stores)
Two new: STK-392-570 CONVERGENCE IC’S
One good soldering iron
Solder
De soldering braid or wick
Liquid flux
Heat sink compound (grease)
Denatured alcohol
One short Philips screwdriver
One small clean toothbrush
One electric screw gun to REMOVE screws
Turn the set on and examine the picture for how the
Convergence looks bad---when you are done examine it again---once in a great
while you will get and install a new IC that is bad. Remember this when you
have finished—if the convergence is still bad but different from what you
started with you may have installed a new I.C. that was bad.
Turn the Set off.
- Unplug
set.
- Remove
back cover.
- Remove
front speaker grill and inspection plate behind it.
- Remove
the 2 or 3 black screws that go thru the back edge of the plastic frame
that hold the chassis down.
- Where
all the video and audio jacks are on the right edge of them you will see a
diagonal plastic (Black) remove the two brass screws from the outside
edge, remove another to the right bottom and a third smaller screw forward
and to the left; remove plastic piece and all four screws and set them
aside.
- Look
carefully at main board in center of the set.
- You
will find a number of screws hold it into the plastic frame.
- Towards
the left back edge of this (to the right of the plastic you removed) you
will find a metal cover with a small screw on either end. It has a lot of round holes punched in
it.
- Remove
both screws and pull the shield up and off---remove the board beneath it
by releasing the two tabs on the bottom right side and pulling the board
out—handle it with care as it is the digital convergence board that stores
the set’s memory of adjustments.
Set it aside
- At
this point you need to pull the entire Chassis back at least a few
inches---If it does not slide back look for a plastic latch on either side
near the front of it. Some sets
have the latches on the left or right side—black plastic tabs that lift
up.
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