No Power - Sanyo PLV-Z2000 Service Manual

● No Power
This projector provides a function which can be specified a defective area simply by indicating the LEDs on the control
panel. Connect the AC cord and turn the projector on and then check the LED indication.
Indicators
POWER WARNING
red/green red
Does a indicator flash or
light?
Yes
Is fuse (F601) broken?
Check SS3.3V power supply line.
- When the main power switch is ON,
SS3.3V line is supplied to IC4801(Sub CPU).
POWER (red) and
Yes
WARNING (red)
indicators are
lighting?
Check following
items
A n a b n o r m a l i t y
Check power supply lines, S5V, -5V, 17.5V, etc. on the Main board.
occurs on the sec-
-
ondary power sup-
ply lines
Power failure detection diodes detect the fan operation stop.
A n a b n o r m a l i t y
Check FN901/902/903/904/905 and peripheral circuit.
occurs on the fan
Check connectors K8E/K8F from TH901/TH902.
control circuits.
-
A n a b n o r m a l i t y
Check power starter signals as follows:
occurs on power
-
starter signals.
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To next page
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Troubleshooting
No
No
The symptom indicates that the projector detected an abnor-
mality in the cooling fan operation or in the power supply sec-
ondary circuits. Check fan operation and power supply lines,
and the driving signal status.
- POWER_FAIL (Error:L) signals are sent to IC301, then IC301 shuts
down the power supply circuit.
Refer to the diagram "Power Supply Lines".
Refer to the diagram "Fan control circuit".
POWER_ON_SW signal (Power-on:H) is output from pin 9 of IC4801 and
sent to the Power Board and 17.5V, S16V_F, 6.5V, S5V, -5V lines are sup-
plied.
MAINON_SW signal (Power-on:H) is output from pin 25 of IC301 and sent
to the Power Board and lamp ballast 375V line is supplied.
3.3V_SW signal (Power-on:H) is output from pin 346 of IC301 and sent to
IC7641, 7651 then 3.3V, 2.5V lines are supplied.
1.8V_SW signal (Power-on:H) is output from pin 247 of IC301 and sent to
IC7661, then 3.3V lines are supplied.
15V_SW signal (Power-on:H) is output from pin 140 of IC301 and sent to
IC7631, then 15.5V line is supplied.
FAN_SW signal (Power-on:H) is output from pin 437 of IC301 and applied
to the Fan power supply circuit.
-83- -83-
Troubleshooting
The primary power supply circuit does
not operate properly.
Yes
Check Varistor (VA611).
Check Power Board.