ViewSonic PJ1158-1 Service Manual page 17

Power can not be turned on
Are
voltage
supplied at pins
(9),(12) and (14) of E800 on
the PWB assembly MAIN in
standby mode?
YES
Are
voltage supplied
at pins (2) and (7) of E800
on the PWB assembly
MAIN in standby
mode?
YES
Does
LAMP (DK03) or
TEMP (DK02) indicator light
or blink?
NO
Measure
resistance*
between pins (1) and
(2) of E808 when the
S941 is pushed.
0Ω
Re-attach lamp
door
ViewSonic Corporation
*: Be sure to unplug the power cord before measuring resistance.
NO
(9): +6.0V
(12): +4.0V
(14): GND
from power unit circuit, and
NO
pins (2) and (4), and between
(2): +15V
(4): GND(for +15V)
(7): +17V
(11): GND(for +17V)
YES
Open
PWB assembly SW
E808, E941
Lamp door PWB assembly MAIN
Measure
resistance* between
pins (9) and (14), and
between pins (12) and
(14) of E800.
Open
Disconnect TSW
measure resistance of
TSW.
Short
Power unit (circuit)
Measure
resistance* between
pins (7) and (11) of
E800.
Open
Power unit (circuit)
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14
Confidential - Do Not Copy
0Ω
PWB assembly MAIN
Power unit (circuit)
Open
Thermal switch (TSW)
Fuse on the power unit
(circuit)
0Ω
PWB assembly MAIN
Power unit (circuit)
PJ1158-1