Question about Toshiba 42H81 42" Rear Projection Television

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Toshiba 42h81 With the main screen on, there are horizontal lines from top to bottom and shaking occurs. However, when you use split screen, the screen on the right is fine and the one on the left is as the main screen. Could it be that the main tuner is out??

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No posible bad solder connections

Posted on Nov 03, 2007


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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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1 Answer

Toshiba/ 42H81 / hyper board

You can either yrplace your Hyper board, or replace all the serfice mount capacitors in it. The cap replacement fixes this 90% of the time.

May 09, 2012 | Toshiba 42H81 42" Rear Projection...

2 Answers

Toshiba 42H81 - Screen flicker

Since the problem initially would correct itself, it suggests a poor connection somewhere that "heat" would resolve. If you can solder, try resoldering any joints that appear to be grainy or have rings. Please note that these sets will retain high voltages that can be dangerous even when unplugged. If the resoldering fails to resolve the problem, let us know and we'll look further.


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1 Answer

Toshiba 27

you just say horizontal lines / and across a top of your television.I expect your trouble is the vertical line of your television . sound ok? try trouble the vertical section the check the resistor?

Apr 19, 2008 | Televison & Video

1 Answer


you have a convergence problem that will require the replacement of the convergence amp ics.

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Any horizontal or sqiiggly lines in the picture or just a loss of light level?

Nov 07, 2007 | Toshiba 42H81 42" Rear Projection...

2 Answers

Toshiba 42h81

Hello, one of possible solutions is to replace capacitors (10uF/50V) on HYPER (PD0246) module. Please ask the tech to check/replace them. If you need more info please advice.

Apr 27, 2007 | Toshiba 42H81 42" Rear Projection...

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LG L1520B

This sounds like either a loose lead connection or a corrupt driver, if its looking like a driver fault you can click Start>Run then type 'dxdiag' then hit enter for windows to check drivers. If it's a driver fault unistall driver in add/remove programmes and restart pc, when it finds your graphics card on startup insert your Graphic card cd rom to install driver again.

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