So many people ask me about this here are my Instructions if convergence will not adjust and or is skewed:
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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
- UNPLUG TV SET.
- Remove back cover of TV set.
- Remove entire front speaker
grill on set(it pulls off and may resist being removed)
- Locate and unplug speaker
wires (they are plugged into the main circuit board).
- Locate 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)
- Remove 2 long philips silver
machine bolts from the front of the set (behind the grill).
- Remove 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.
- Using 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 edges.
- Remove 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)
- Turn 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.
- Inspect 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.
- With 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.
- Remove both IC’s.
- Apply 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.
- Presuming 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
- Slide entire light box back
into the cabinet.
- Reconnect 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.
- Position the box so it is all
the way in place and none of the wires or plugs are pinched.
- I 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
- 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
- Once 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.
- NOTE: 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 back in.
- You 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.
- Most of the time adjusting in
the customer menu will give you a very acceptable picture.