Troubleshooting; No Power - Sanyo PLV-Z4 Service Manual

■ Troubleshooting

● No Power
This projector provides a function which can be specified a defective area simply by indicating the LEDs on the con-
trol panel. Connect the AC cord and turn the projector on and then check the LED indication.
Indicators
POWER WARNING
red
red/green
Does a indicator flash
or light?
Yes
Is fuse (F601) broken?
Check SS5V power supply line.
- PWR_SW signal (Power-on:H) is output
from pin 12 of IC4801 and sent to the
Power Board and SS5V line is supplied.
Yes
WARNING (red)
indicator are
lighting?
Check following
items
An abnormality
Check power supply lines, S5V,S-5V, S16V, etc. on the Main
occurs on the sec-
board.
ondary power sup-
-
ply lines
An abnormality Power failure detection diodes detect the fan operation stop.
occurs on the fan Check FN901/902/903/904/905 and peripheral circuit.
Check connectors K8E/K8F from TH901/TH902.
control circuits.
-
An abnormality Check power starter signals as follows:
occurs on power
-
starter signals.
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Troubleshooting
No
No
The symptom indicates that the projector detected an
abnormality in the cooling fan operation or in the power
supply secondary circuits. Check fan operation and power
supply lines, and the driving signal status.
- POWER_FAIL (Error:L) signals are sent to IC301 via IC871
and IC1801, then IC301 shuts down the power supply circuit.
Refer to the diagram "Power Supply Lines".
Refer to the diagram "Fan control circuit".
MAINON_SW signal (Power-on:H) is output from pin 80 of IC301
and sent to the Power Board and S16V, S16V_F, S6.5V, S5V, S-5V
lines are supplied.
5V_SW signal (Power-on:H) is output from pin 336 of IC301 and
sent to IC1581, IC8251, IC8281, Q4601, Q4603, then 12V, 3.3V_D,
3.3V_A, -5V, 6.5V lines are supplied.
3.3V_SW signal (Power-on:H) is output from pin 76 of IC301 and
sent to IC3601, then 3.3V, 1.2V lines are supplied.
15V_SW signal (Power-on:H) is output from pin 79 of IC301 and
sent to Q591, then 15.5V line is supplied.
FAN_SW signal (Power-on:H) is output from pin 81 of IC301 and
applied to the Fan power supply circuit.
-80-
The primary power supply circuit
does not operate properly.
Yes
Check Varistor (VA611).
Check Power Board.