I have had so many people with this kind of problem ask that I have composed the following instructions:
If picture looks 3D and in the customer menu convergence is skewed or red or blue will not move in some direction here is what is needed to fix this problem.
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PANASONIC CONVERGENCE IC REPLACEMENT:
What you will need;
Two new STK-392-110 convergence Ic’s
Liquid solder flux
Desoldering braid or wick
A good soldering Iron
Some denatured alcohol
A small toothbrush
A Philips screwdriver or screw gun to REMOVE SCREWS
A PAIR OF GLOVES
back cover of TV set.
entire front speaker grill on set(it pulls off and may resist being
and unplug speaker wires (they are plugged into the main circuit board).
three cables with wires that come from the Front keyboard—two of them have
to be unplugged from the main board(all plugs are different sizes but note
where they go)
2 long philips silver machine bolts from the front of the set (behind the
4 more in the back of the set; two
are located at the extreme back edge of the plastic frame and hold the
chassis down; two more are located on either side and also go straight
down; note which are which and set them aside.
gloves pull the entire metal box (it is called a light box) out of the
set; there are hand holds on either side—careful as the metal has sharp
the box from the set and locate the two Convergence IC chips; they are
located on identical metal heat sinks with fins and they should have the
STK-392-110 number clearly printed on them in white (they are black)
the light box over on its side and UNSOLDER ALL 18 PINS ON EACH IC. It is
a good idea to apply liquid solder flux to the pins on both chips now. I recommend using a de-soldering braid
for this—get all the pins completely de-soldered.
the dozen or so light blue resistors in front of them; most are marked 2.2
ohms—if any are white in the middle you will need to replace them at the
same time; best way is to check all of them like checking a fuse----they
protect the set if one of the STK’s shorts in any way.
the STK’s completely unsoldered turn the box upright and remove the two
screws on each IC. If the chips
have never been replaced you will need to tap them loose with a putty
knife or flat bladed screwdriver.
heat sink grease to the two new IC’s and install them one at a time; this
part can take some time and it is important the pins on the new IC’s are
perfectly straight---once you get them in, Hand tighten both the screws on
each IC---do not use a screw gun—you can strip the screw holes out. Clean the bottom of the circuit board
where the chips were soldered with some denatured alcohol and apply liquid
solder flux to all the pins.
you have already found/replaced any bad resistors turn the box back over
and solder carefully both of the two new IC’s in, --do not short any of
the pins to each other when you do this and when you are done it is a good
idea to take a close look at both to make sure all pins are soldered and
not touching each other with soldering you have just done. I suggest you
do clean the pins on the bottom of the circuit board again with denatured alcohol.
entire light box back into the cabinet.
the plugs you removed when you removed the box. At this point take a lens
cloth or a paper towel with glass cleaner sprayed on it and clean the
three large black lens-if they are dusty the picture will be darker and
not as clear as is should.
the box so it is all the way in place and none of the wires or plugs are
usually at this point turn the set on before I replace the Six bolts that
hold it in—2 from the front and the four in back----this way if you have a
problem you can remove the box faster.
- If the
set comes on and now has normal Convergence go into the customer menu and
adjust the convergence in the multi-point mode----CAREFUL! THE FIRST
OPTION this set usually offers is a
green cross in the middle of the screen—do not adjust Green!
you have the Red and Blue in the center adjusted find the second
convergence mode---it will give you 8 or nine points on the screen with
instructions on how to change from blue to red---use the original remote
with the thumb wheel or cursor buttons to adjust.
SOME of these sets need to have the Convergence adjusted in first:
full/4:3 and second in the other two zoom/wide zoom and third on the HD
input with a HD signal coming in.
There is also an option at this point to go into the Technical menu
and fine adjust the convergence all over the screen—if you need this I can
give you instructions based on the model you have—most of the time
adjusting the set in the customer mode will produce a good result.
- I know
all this may seem complicated to you, but this repair should take about an
hour or so and just take your time when you get to adjusting the set.
- If all
looks good turn the set off and Unplug it; install all 6 of the chassis
bolts back; replace the back cover and the Speaker grill and plug the set
may find it useful to go over the convergence Adjust again—to get all the
points as good as you can. There is
a hidden Tech menu that will allow a finer adjustment of the entire
screen----it is somewhat difficult to access and there are a lot of
buttons on the remote that then do different things.
of the time adjusting in the customer menu will give you a very acceptable
I also have similar step by step instructions for Mitsubishi sets made around the same time as these sets.