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Do all the fluorescent tubes light up?
Is 60V supplied to Connector (CN7302) (20-23) pin?
Is UR12.5V supplied to Connector (CN7302) (10)pin?
Is UR12.5V supplied to (26) pin of IC7700 (INV-CTL)?
Is the STB-ON/OFF signal supplied to (16) pin (or (4) pin of a
connector (CN7302)) of IC7700 (INV-CTL)?
Is each control signal coming to the connector in INV-UNIT
(CN7302)?
•
ADIM (Tube current setting): (1pin)
•
OFL (PWM light control signal input): (2pin)
•
ERR (Lamp error output): (3pin)
•
BRT (Light control method identificatio): (5pin)
Is [0] displayed as the number of [LAMP_ERROR] in the process
mode?
Is the drive output signal sent from PIN (31) and (32) of IC7700
(INV-CTL)?
Does the drive output circuit normally work?
(Q7800-Q7806)
(Q7809, Q7807, Q7811, Q7810)
Is the circuit by the side of secondary operating normally?
(T7903-T7905)
Is the circuit by the side of secondary operating normally?
(D7900-D7905)
(D7919/D7921/D7923/D7925/D7927/D7929)
The backlight does not light up.
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Check each fluorescent tube and exchange defective fluorescent
tubes.
NO
Refer to troubleshooting "No power supply (Front LED does not
light up)" of a power supply.
Or check a peripheral circuit. (Q7809, Q7807, Q7811, Q7810)
NO
Refer to troubleshooting "No power supply" (Front LED does not
light up) of a power supply. Or check a peripheral circuit.
NO
Check UR12.5V-line in an INVERTER unit.
NO
Check the STB-ON/OFF signal-line in an INVERTER unit.
NO
Check each control circuit.
ADIM-H: Tube current 12mA, L: Tube current 8.5mA
OFL -H: Lamp ON, L: Lamp OFF
ERR -H: Normal, L: Error
REG2-H: External PWM input, L: Analog voltage input
NO
Reset the number of [LAMP_ERROR] to the default value in the
process mode.
NO
Check IC7700 (INV-CTL) and the peripheral circuits.
NO
Check which parts are defective.
And exchange the non-conforming articles.
NO
Check defective parts and exchange the inferior products.
NO
Check defective parts and exchange the inferior products.
4 – 29
LC-32DH57E/RU/S
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