I have a Hitachi 55FX48B that was purchased in early 1998. I am beginning to see the picture "jump" a little - Channel Five more than the others. It is almost like one would want to adjust the horizontal knob in the "old days." It does not happen all the time and seems to happen more when the TV is first turned on. I know the TV is older and wonder if this is a sign that is on its last leg or if there is a simple inexpensive remedy.
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On older Hitachis the most common jumpy picture is loose connections on the vertical output IC. If you can tap on the main board and get it to act up then this is most likely the situation. I believe the location is IC401 and is located toward the front of the set on the signal panel. Not too tough to repair if thats all it is.
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The color wheel can cause a black and white picture but not the jumpy or negative look.
Those symptoms are usually caused by the DMD assy which drives the color wheel and is somewhat expensive, most of the time you can purchase the whole Light Engine which includes the DMD assy for the same price.
ck for dry solder joints if you take rear cover off and just lightly tap on convergence ic heat sink if the tv jumps then you have to remove the board and resolder the joints. also if you have a magnifying glass ck all solder joints on board when it is out
Well jumping has nothing to do with lamp so called bulb.
You have what I would call a cold solder joint.
You're going to have to open the set and tap gently to see were it is comming from. If you know anything about soldering they you will know it is not that easy.
Once you think you have found the place were it seam's to be the place were it make's it jump more often, start again to make shure that's the spot and not the hole area.
Then remove the board and resolder,
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