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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  • Charlie Pfeifer Feb 03, 2007

    Thank You!! Great Solution

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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.

Posted on Jan 31, 2007

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Posted on Jan 02, 2017

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Hello,
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 ([email protected]).) 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.

This is will require you to open the back cover of the television alongside an ohmmeter to read components on the printed circuit board of the television..
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1 Answer

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Hitachi 55FX48B 55 in. Rear Projection Television


ok, let me post here service manual website Please download all 11 part of file (0 t0 10) and unzip it.
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Sep 02, 2008 | Hitachi 55FX48B 55" Rear Projection...

1 Answer

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1 Answer

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