Trouble Shooting For Inverter Pcb - LG LMC1575BD Service Manual

Trouble shooting for inverter PCB

Inverter PCB
(Inverter PCBA : EBR817180XX)
<Inverter PCB 'TOP' view>
LMC1575BD /00
LMC1575ST /00
LMC1575SW /00
LMC1575SB /00
Heat sink
Bridge
IGBT
Diode
Choke
Coil
Current
Transformer
High Voltage
Transformer
L - N
(Input)
Communication
Connector High
Sub Voltage
PCB Capacitor
LMC1575BD /01
LMC1575ST /01
LMC1575SW /01
LMC1575SB /01
Heat sink
Shunt resistor
Bridge
Diode
Choke
Coil
DC
capacitor
L - N
(Input)
Downloader
Connector H.V Transformer
Comm.
Connector
H.V Capacitor
DC
Capacitor
Resonant
Capacitor
Earth
Wire
High
Voltage
Diode
MGT
(Output)
IGBT
Resonant
capacitor
Earth wire
High
Voltage
Diode
MGT
(Output)
<Inverter PCB 'BOTTOM' view>
LMC1575BD /00
LMC1575ST /00
LMC1575SW /00
LMC1575SB /00
CN3
L - N
ZD201
TH91
D5
Q1
LMC1575BD /01
LMC1575ST /01
LMC1575SW /01
LMC1575SB /01
CN3
L - N
TH91
ZD201
D5
5-19
D9
D8
※ Inverter PCB Most Check Points
• Communication Connector : CN3
• AC Terminal : L – N
D8
• Bridge Diode : D5
• IGBT : Q1
• Zener Diode : ZD201
• Temp. Thermistor : TH91
D9
• High Voltage Diode : D8, D9
Q1