Sony RM-PJ4 / VPL-ES4 / VPL-EX4 Service Manual ▷ View online
3-3
VPL-ES4/EX4
3-2. Power Board Troubleshooting
3-2-1.
No Power
Check LED circuit of
main board.
main board.
No Power
No
Yes
F601
Open?
Yes
Q601(D-S)
Short ?
No
No
Yes
No
Output
5V DC
5V DC
exists ?
Voltage
outputs shut
down and built
repeatly ?
Check if CN701 inserted
properly.
properly.
Check if miss to solder
any SMD type of
components.
any SMD type of
components.
Yes
Replace Q601 and F601
with new ones, and then
put power board into set.
If Q601 damages again,
check if other parts are
shorted.
with new ones, and then
put power board into set.
If Q601 damages again,
check if other parts are
shorted.
Check if 15.25V or 12V
exist. If any voltage is
wrong, replace IC701 or
T602 with new ones.
exist. If any voltage is
wrong, replace IC701 or
T602 with new ones.
Check if D602 or IC602 is
broken.
if yes,replace it with now
one.
broken.
if yes,replace it with now
one.
Check CN701 and find
out if some points are
shorted to gound.
out if some points are
shorted to gound.
3-4
VPL-ES4/EX4
3-2-2.
Failure of Turn on Lamp
Failure of turn on ballast.
No
Yes
Check if the input
voltage of ballast is
380V DC
B
A
Lamp
Broken ?
Yes
No
Control
Pin (SCI) is
normal ?
Yes
Replace ballast with new
one.
one.
Check main board.
Replace lamp with new
one.
one.
No
3-5
VPL-ES4/EX4
B
A
No
Q602 works
normally ?
Check ZD602, R655 and
R656.
R656.
Check mian board.
No
Yes
F602 Open ?
Replace F602 with new
one.
one.
Check Q701 IC604,
Q604, Q603 or ZD603.
And then replace broken
parts.
Q604, Q603 or ZD603.
And then replace broken
parts.
Check if 18V
exists at c-terminal
of Q603.
Yes
Yes
Check if there
is PFC_On/Off
signal.
Yes
No
No
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