Video Noise, No Sync - Mitsubishi Electric DPro930SB-BK Service Manual

3. VIDEO NOISE, NO SYNC

CHECK D116, D115
R108, R118
TROUBLE IN U501
CHECK
Q101 G-S FREQUENCY
YES
SYNCRONIZE
NO
WITH H-SYNC
YES
CHECK
U501 G-S FREQUENCY
NO
1, 15 PIN
CHECK U701
39, 33 PIN
NORMAL OPERATION
FREQUENCY L501 SYNC "+"
NO
NO
6-4
CHECK HORIZONTAL
TO GND, D116 TO GND
TROUBLE IN U701