Question about Toshiba 43H70 43" Rear Projection Television

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Picture is getting dimmer

I have had my 43H70 for about 8 years now and it seems that my picture is getting dimmer. I have increased the brightness level but no luck. Do the CRT's burn out?

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After 8 years use, perhaps the lenses and mirror could do with a good clean.

Posted on Jun 18, 2008

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Yes! CRT's do go weak with age and use. It is very possible that the CRT's are the problem.

The service tech can take voltage readings of the power supply, and biases to the CRT's to know if they are actualy weak.

From your description, I would thing very strongly that the CRT's are the problem.

Jerry G.

Posted on Jun 13, 2008

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This is likely a simple settings issue.

A lot of people don't realize that backlight settings can affect the picture.

Go to the menu (press menu on your remote)

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Does not seem like a bad tube alone. Could also be that the Video output Transistors Supply Filter capacitor having dried out. It is a 100mfd 160V capacitor, which on replacement will improve the brightness of the immage. And yes, you could also try increasing the heater voltage (Filament Voltage)of the Pictuire tube, this will definitely increase brightness, but will reduce the life of the Picture tube. You gotta think - 10 year old TV, should I repair or exchange and get a new one???

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