Sharp 29F-PS370 Service Manual page 41

Snow noise
increase
Does 5V appear
at pin 7 of TU 251?
YES
Does 31V appear
at pin 9 of TU 251?
YES
Check TU 251
NO PICTURE
Does the snow noise
appear on the screen at
YES
maximum contrast and
brightness ?
NO
Check the PC+5V line.
Check +120V line and
its related circuit.
4 - 4
NO
A
29F-PS370