Question about Mitsubishi WD-52725 52". Rear Projection HDTV

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Horizontal Lines On Screen

There are horizontal black lines appearing on the screening that seem to flow from the bottom of the screen to the top. More obvious on solid color backgrounds. Bought the tv in Nov 2004 and just started to notice in the last 30 days

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  • brand1m Nov 09, 2008

    Bought the TV Dec/04 and in the last 2 months started getting these horizontal lines that flow bottom to top. Very annoying.

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  • 173 Answers

Horizontal lines = horizontal sync off . mitsbishi always seemed to have this problem .. on the older sets I would take the back off and inside deep on the board i would adjust a pot and sync it right .... and never had a recall, maybe your newer model has this too .. this little control,

but its a horizontal sync problem.

if no change the horizontal processing ic.

Posted on Jan 19, 2008

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Posted on Jan 02, 2017

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Wavy horizontal lines across the screen


It sounds that the main power supply section to your TV has the fault. The horizontal thik lines that appears crawling down across the screen should be of video 'HUM'. Have you replaced the main filter capacitor at the power supply section? If not, replace it along with the main rectifier. The AC power is rectifed by a bridge and applied ot this main filter capcitor. It will have a capacitance value between 120 to 350MFD 450VDC. Check this section. Measure the rectifed DC voltage acorss this main filter capacitor. It should be around 350VDC, if your home power supply line is 220VAC. If it is 110AC, this DC voltage will be around 165VDC; and it should be. If rectified DC voltage found lower than the input AC voltage, replace the rectifier bridge. In some sets, this bridge section have four diodes. Some other circuits, a bridge rectifier stalk may be used.

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Sounds as if you have a bad capacitor in the horizontal deflection or video circuitry. You can spot a bad capacitor in circuit with a ESR meter.Hope this helps.

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