Question about Hitachi 55FX48B 55" Rear Projection Television

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Jumpy Picture on Hitachi 55FX48B

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. Thanks!!!!

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Re: Jumpy Picture on Hitachi 55FX48B

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.

Posted on Jan 31, 2007

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This indicates an Automatic Gain Control (AGC) problem often caused by a dried up capacitor. You will probably need a schematic to go much further. This could be a problem in the tuner, IF, or video amplifiers.

The following assumes you are sure the signal source is strong - try a VCR or other local one (channel 3/4, not the RCA jacks).

(From: Glenn Watkins ( Substitute a variable voltage source for the tuner's AGC voltage. Most of the time the range of AGC is from 1 to 7 volts. If you can get a decent snow free picture with an external AGC source, then the tuner is probably OK.

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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

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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,

Good luck
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Timmins, ontario
Home of Shania Twain.

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Needs Convergence amps replaced. Also fuses around this board are out. There should be small pico-fuses open around this board(replace)

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