My flat screen turns on then turns right back off.

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Its likely your flat screen has a cold cathode florescent backlight (CCFL). Unfortunately these are consumable devices and eventually burn out.

The reason why it works for a second or two is because the controller chip will ignite the backlight and measure its current draw. As the tube ages it draws more current. If the current is too high the backlight is shutdown to prevent overheating.

Unfortunately this isn't an easy fix, you need to disassemble the lcd panel inside the plastic casing and replace the backlight tube. From experience of doing this fix, I would recommend that you buy a whole monitor and scrap your faulty one.
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ElectronicMasterEngineer

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Aug 14, 2014
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Its likely your flat screen has a cold cathode florescent backlight (CCFL). Unfortunately these are consumable devices and eventually burn out.

The reason why it works for a second or two is because the controller chip will ignite the backlight and measure its current draw. As the tube ages it draws more current. If the current is too high the backlight is shutdown to prevent overheating.

Unfortunately this isn't an easy fix, you need to disassemble the lcd panel inside the plastic casing and replace the backlight tube. From experience of doing this fix, I would recommend that you buy a whole monitor and scrap your faulty one.
 
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wolflordgaming

Reputable
May 16, 2014
42
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4,530


Can you send me a link to the backlight tube?

 
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