LG LMC1575SB - Inverter PCB Diodes and IGBT (F-19) Testing

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4. F-19 Inverter PCB Check
G
C
E
Refer to Check point
※ Tester mode : Diode mode
Status Test result
Normal 0.4V ↑(about 0.4 ~
0.6V)
Abnormal 0.4V ↓ or short
※
Tester mode : Beep mode or resistor mode
Status Test result
Normal About 10Kohm
Abnormal 10Kohm ↓ or short
• Check D5 (Bridge Diode), D8 / D9 (High Voltage Diode)
• Check Q1 (IGBT)
Bridge Diode : AC Checking Bridge Diode : DC Checking HVD : D8, D9 Short Checking
Example : normal
Example : normal
Example : normal
(Open)
Example : abnormal
(Short)
Example : abnormal
(Short)
※ Tester mode : Beep mode
Status Test result
Normal Open (OL)
Abnormal Short (Beep)
LMC1575BD /00
LMC1575ST /00
LMC1575SW /00
LMC1575SB /00
D9 D8
Example : abnormal
(Short)