Why does the LCD light on my Volvo OEM radio keep fading to off?

frozenblue3000

New Member
When I turn on my radio, the light for the LCD will come on, and then it fades out and will not come back on until the car has been off for a few hours. Is the bulb bad or is it something else?

1990 Volvo 740 GL Sedan
The radio unit has a volume/on/off knob on the left and a radio dial on the right. It is the AM/FM/FM2/Cassette model.
 
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