Question about Televison & Video
The picture on the tv rolls at times and this can pursist for a long time but can also stop on it's own
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: rolling picture
If your Television is not warrantied, there should be rca, vga, and dvi connections you can use with your pc and video card. Since I am in usa I have know idea what freeview, skybox, or scart are.
Posted on Dec 15, 2006
I have seen this many times. There is a 9 volt regulator on the small signal board that causes this. The regulator goes bad and the 9 volts starts dropping, especially at start-up when the regulator is cold. If the voltage is below 8 volts then the picture gets dark and the vertical becomes unstable, with the picture squeezing down and/or rolling. As the regulator warms up the voltage starts rising back towards 9 volts and the symptoms start clearing up. There are 3 regulators in a row on the board and the regulator in the middle is always the bad one. Replacing that regulator should cure your problems but it should be replaced by someone experienced in servicing Mitsubishi projection TV's because pulling the chassis out is quite tricky.
Posted on Aug 05, 2007
SOURCE: HORIZONTAL HOLD
The answer is yes, if all you have to do is to adjust the horizontal hold control (usually located on the back of the TV)
The answer is no (with caveat) if you have to open up the set. This problem occurs when the horizontal oscillator is drifting off its set frequency of 15,750 Hz This can be caused by a component or components changing in value, or the problem could be caused by the loss of or decrease in the amplitude of the horizontal sync pluses within the video signal. Such a loss of amplitude can take place from the output of the Video detector to the Horizontal mixer stage (uses the Video pluses and the Horizontal oscillator to sync the picture). This means that you will be working around a hazardous section of your TV.
The caveat is if you have a background in electronics and you have the proper equipment.
1) schematic diagram of the TV to see where TV test-points are
2) multimeter to measure DC voltages at test points
3) oscilloscope to view waveform patterns in the horzontal section of the TV
4) Signal generator to produce a know good signal into the TV set.
5) Isolation Transformer to connect the TV power plug to to isolate the Tv ground from earth ground and allow proper connectivity for test equipment (plug the unit under test into the isolation transformer and the test equipment into the wall outlet.)
I hope this answers your question,
Posted on Nov 26, 2007
My sister-in-law has exactly the same problem and is a common one with this unit.
I've spoken to a technician who says that:
1. Hitachi are withdrawing from Australia and there are VERY limited service centres left
2. The problem is a chip on the main board and depending when the TV was made will determine whether the chip is a plu-in or soldered on to the main board - if it's the latter, you'll be up for a main board at around $400
3. He couldn't get the price of the plug-in chip because he couldn't get through to Hitachi.
Posted on Apr 28, 2008
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