Sony VPL-ES4 Service Manual page 23

Check mian board.
A
VPL-ES4/EX4
B
No Check if there
is PFC_On/Off
signal.
Yes
Check if 18V
exists at c-terminal
of Q603.
Yes
F602 Open ?
No
Yes
Q602 works
normally ?
No
Check ZD602, R655 and
R656.
Check Q701 IC604,
Q604, Q603 or ZD603.
No
And then replace broken
parts.
Yes
Replace F602 with new
one.
3-5