Power LED
Flashes
Disconnect the
Digital Main board
from the Power
Supply.
Jumper to the AL3.3V
supply to the P-ON-H1
and P-ON-H2 to force
the power supply On.
Is Protect2 (Pin 15 of
CN301) Low?
Repair or replace
the power supply.
High
Is Protect1 (Pin 11 of
CN301) High (2.4V)?
Low
One or more of the B+ supplies are
missing. Repair or replace the power
supply.
Low
High
Is approximately 160V DC
present between pins 1 and 2 of
CN602 on the power supply?
Reconnect the Digital
Board and monitor the
PROTECT3 voltage on
pin 6 of CN201 as the
set is turned On.
Yes
Repair or replace the
power supply board.
No
Does the PROTECT3
line go to 3.3 volts when
the set is turned On?
Does the BACKLIGHT-SW on pin
5 of CN201 go to 3.3 Volts when
the set is turned On?
No
Replace the Digital Main
board.
Yes
Replace the Inverter
board.
Yes
Replace the Digital Main
board.
No
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TROUBLESHOOTING FLOW CHART
Summary of Contents for FL9.1
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