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CHAPTER 4.
LC-32DH57E-BK
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
No power supplied (Front LED does not light up). No power-up even if turned on (Front LED light up)
Is the power cord connector, AC-IN harness, and PD harness
connected to the POWER unit normally?
Is the connection of B to B connector between the POWER
unit and the INVERTER unit normal? (P7201-CN7302)
Are F7001 (3.15A) and F7002 (3.15A) normal?
Is DC310V supplied to the primary side capacitor C7114 and
C7108, when the power switch is turned on?
Is UR12.5V supplied from pin (13) (14) of PD connector
(P7202), when the power switch is turned on?
Is about DC400V supplied to primary side capacitor C7112?
Check whether the PS_ON "H" signal is inputted to the pin (6)
of PD connector (P7202) in the power supply unit.
Check again after remove parts which have trouble or a short
circuit. Is UR12.5V supplied from pin (13) (14) of PD connec-
tor (P7202)?
After the power supply is turned on, is INV60V generated in
connector P7201 (20-23) pin? (*1)
Is BU3.3V/D3.3V supplied to pin (5) (6) of RA connector
(P3301) in a main unit, and pin (1) (2) of P101 in the R/C unit?
"No power supplied (Front LED does not light up)". "No
power-up even if turned on (Front LED light up)." Is it OK?
YES
YES
YES
YES
YES
NO
YES
YES
YES
YES
YES
Service Manual
NO
Reconnect the power cord, the AC-IN harness and PD harness cor-
rectly.
NO
Correct connection or the short circuit of a B to B connector nor-
mally. (P7201-CN7302)
NO
Replace F7001 or F7002 and switch on the power again.
If Fuse still blow out, check L7001, L7002, D7104, VA7001, and
VA7002.
NO
Check whether there are any abnormalities in a rectification circuit.
(D7104, C7114, C7108, L7101)
YES
(*1) fly to the check item of INV60V.
NO
Check whether there are any abnormalities in a power factor
improvement circuit. (IC7101, Q7103, D7113, D7213)
NO
Check whether the PS_ON "H" signal is outputted to pin (10) of PD
connector (P9601) and pin (AC11) of IC3303 (VCT) in the MAIN unit.
NO
Is there a part which breaks down on the UR12.5V line or short-cir-
culated?
Check the power control circuit of UR12.5V.
(IC7201, T7206, D7217, C7220, C7222, C7228, D7215)
YES
Check again after remove parts which have trouble or a short circuit.
NO
Is connector CN7302 of the INV unit removed, and is INV60V gener-
ated in connector P7201 (20-23) pin?
Check the inverter power circuit of INV60V.
(D7227, C7221, C7223, T7206, D7220, D7221)
YES
It is failure inside an INV unit. check broken parts or a shorting part.
(Q7809, Q7807, Q7811, Q7810, etc.)
NO
Check the power supply circuit of BU3.3V and D3.3V.
(IC9605, IC9607/IC9602, etc.)
NO
Review the former step and check it again.
4 – 1
LC-32DH57E/RU/S
NO
NO
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