LED blinks 4 times
<Trouble Mode and Defective Board>
Trouble Mode
Power Supply SOS
Defective Board
Primarily P board or possible D board
<How to find the defective boards>
D Board
Turn the unit on.
Is pin 16 of CN P25 of
the P board high
before shutdown?
P Board
Yes
No
Warning: Disconnect AC Power prior to
making any disconnection or
connection.
11
LED blinks 5 times (Quick Troubleshooting)
<Trouble Mode and Defective Board>
Trouble Mode
5V SOS
Defective Board
D, P, C, SC, SS board or Panel (DDIC)*1
<How to find the defective boards>
Is the resistance of pin 1 of
the lead cable P12 zero
ohm?
Disconnect CN P12
of the power supply board. Measure the
resistance of pin 1 of the lead cable to ground.
Yes
Warning: Disconnect AC Power prior to
making any disconnection or
connection.
(*1) = Data Driver IC
12
Proceed to more extensive troubleshooting of
the pages that follow.
Panel
No
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