ViewSonic PJ452 Service Manual - Page 16

PWB assembly MAIN

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Lamp does not light What is the state of LAMP indicator D303 during operation? Light Not light Is the LAMP NG installation correct? YES Install the Lamp Change the lamp. Does lamp light? Light Lamp Not light Is the voltage at the (1) of E804 on the PWB assembly MAIN fixed to "L" during warming-up? YES "L" = 0V PWB assembly MAIN NO Power unit (ballast) Power unit (circuit) DC FAN (Sub) Is the NO * voltage at the pin (1) of E806 on the PWB Blinks What is the state of TEMP indicator D302? assembly MAIN set to "L" ? YES (L=0V) Not light DC FAN (Exhaust) H (3.3V) Measure voltage at pin(1) of E801 on PWB assembly MAIN. L (0V) Is the voltage at the (3) of E804 on the PWB assembly MAIN NO set to "L" during warming-up? "L" = 0V YES PWB assembly MAIN DC FAN (B Panel) H (3.3V) Measure voltage at pin(1) of E807 on PWB assembly MAIN. Power unit (ballast) L (0V) DC FAN (R/G Panel) H (3.3V) Measure voltage at pin(1) of E802 on PWB assembly MAIN. L (0V) PWB assembly MAIN ViewSonic Corporation Confidential - Do Not Copy 13 PJ452

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Lamp does not light
What is the
state of LAMP indicator
D303 during operation?
Power unit (ballast)
Lamp
PWB assembly MAIN
Power unit (ballast)
Light
PWB assembly MAIN
YES
Not light
NO
YES
Change the lamp.
Does lamp light?
Power unit (circuit)
Not light
Install the Lamp
Light
NG
Is the LAMP
installation correct?
YES
NO
What is the state
of TEMP indicator D302?
Not light
Blinks
DC FAN
(Exhaust)
H (3.3V)
"L" = 0V
L (0V)
L (0V)
Is the
voltage at the
(1) of E804 on the PWB
assembly MAIN fixed to "L"
during warming-up?
"L" = 0V
Measure
voltage at pin(1)
of E801 on PWB
assembly MAIN.
DC FAN
(B Panel)
Measure
voltage at pin(1)
of E807 on PWB
assembly MAIN.
Is the voltage
at the (3) of E804 on
the PWB assembly MAIN
set to "L" during
warming-up?
DC FAN
(Sub)
NO
YES
(L=0V)
Is the
voltage at the pin
(1) of E806 on the PWB
assembly MAIN set
to “L” ?
*
H (3.3V)
DC FAN
(R/G Panel)
L (0V)
Measure
voltage at pin(1)
of E802 on PWB
assembly MAIN.
PWB assembly MAIN
H (3.3V)
ViewSonic Corporation
Co
nfidential
- Do Not Copy
P
J452
13