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LC-30HV4M
LC-30HV4H
Is the power cable connected properly?
Is fuse (F701) in order?
Is the BU+5V line (pin (1) of P1703) in order?
Are the wire harness and FFC connected properly?
Does the voltage of the OVP line (pin (8) of P1702) fluctuate
after power-on?
Are DC/DC converter outputs and MOS-FET (Q1707 and
Q1708) in order?
Replace IC1703.
The power does not turn on even through the power button is pressed. (The red power LED on the front panel does not turn green or
is blinking red).
Is the system cable connected properly between the Display
and the AVC System (DISPLAY OUTPUT1 and DISPLAY
OUTPUT2)?
Are the power switches of the Display and AVC System on?
Are the UR+6V, UR+10V and UR+13V lines (pins (1), (2), (7)
and (9) of P1702) in order?
Are the D+1.8VCV line (pins (5) and (6) of P1701), D+3.3V
line (pin (8) of P1701), D+5V line (pin (1) of P1701) and
A+5V line (pin (3) of P1701) in order?
Check the wire harness and FFC for proper connection.
TROUBLE SHOOTING TABLE
(AVC System)
Power cannot be turned on. (The power LED on the front panel does not light up).
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
YES
NO
Plug the power cable connector and retry to turn on the
power.
NO
Replace the fuse and retry to turn on the power. If the fuse burns,
check VA701, D701 and IC701 and replace if necessary.
NO
Check the BU+5V line for correct impedance. (Measure the
resistance between Pin 1 and GND).
NO
Remove the cause of fault or
short-circuit.
Check connections of the wire harness and FFC and
NO
reconnect if necessary.
Check power supply internal devices (IC701, IC721, PC702,
NO
Q702, D708 and D705).
NO
Check DC/DC converter output lines and MOS-FET (Q1707
and Q1708) and replace if necessary.
NO
Reconnect and retry to turn on the power.
NO
Turn on the power switches of the Display and AVC System.
NO
Is PS_ON (pin (3) of P1702) pulled high (3.5V)?
YES
Check the PS_ON line.
YES
Is the impedance of the UR+6V, UR+10V and UR+13V lines
correct? (Measure the resistance between pins (1), (2), (7), (9)
of P1072) and GND).
Check the UR+6V, UR+10V and
UR+13V lines and devices on the
lines.
Is D_POW (pins (32) and (34) of IC1703, pin (2) of IC1704
and pin (2) of IC1705) pulled high?
YES
Check the D_POW line (pin (6) of
IC1503).
Are MOS-FET (Q1707 and Q1708) and REG. IC (IC1704 and
IC1705) in order?
NO
Check each output line and replace MOS-FET (Q1707 and
Q1708) and REG. IC (IC1704 and IC1705).
54
YES
Check IC1702 and its
peripheral circuits.
NO
NO
NO
YES
Replace IC1703.
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