No Power - Sanyo PLV-Z800 Service Manual

Troubleshooting

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?
No
Is fuse (F601) broken?
Check SS.V power supply line from the
Eco Power board.
- When the main power switch is ON,
SS.V 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 FN901/902/90/904/905 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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troubleshooting
Yes
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 IC01, then IC01 shuts
down the power supply circuit.
Refer to the diagram "Power Supply Lines".
Refer to the diagram "Fan control circuit".
STANDBY_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.
POWER_ON_SW signal (Power-on:H) is output from pin 25 of IC01 and
sent to the Power Board and lamp ballast 75V line is supplied.
.V_SW signal (Power-on:H) is output from pin 46 of IC01 and sent to
IC7601, 7651, 7611 then .V, 2.5V, 1.0V lines are supplied.
1.8V_SW signal (Power-on:H) is output from pin 247 of IC01 and sent to
IC7641, then .V lines are supplied.
15V_SW signal (Power-on:H) is output from pin 140 of IC01 and sent to
IC761, then 9V line is supplied.
FAN_SW signal (Power-on:H) is output from pin 47 of IC01 and applied
to the Fan power supply circuit.
- 84 -
The primary power supply circuit does
not operate properly.
Yes
Check Varistor (VA611).
Check Power Board.