Inverter Pcb - LG MULTI V 5 Manual Book

14.2 Failure Cause
1. High voltage (T-N more than 484V, N phase wiring fault) → CH50
2. Rainwater inflow by Control box / Front Panel / Service port open, Control box screw loosening
3. Part short by foreign substance
4. Defective PCB / Diode / Resistance / Capacitor / Regulator
14.3 Precautions of Replacement
1. Be sure to use the main PCB suitable for the model (Check P/No)
2. Be sure to turn off the power and wear insulated gloves before touching the PCB.
3. Use box or bag only for PCB.
4. If on-boarding is required after replacement, check the program and EEPROM C/Sum (especially when
using an alternate Main PCB)
14.3 Check Point after Replacement
1. Check whether there is any abnormality when the cycle is stabilized at cooling or heating mode.
2. Check current Hz control according to target Hz
3. Check that the target high / low pressure is reached
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15. Inverter PCB

17. Inverter PCBA
15.1 Failure Judge Method
1.1 불량 판단 방법
1. Error code check
Error Code
- · Checking restart after power reset
에러 코드
· Even after checking 220V connection condition for Inverter SMPS
CH52, CH57
power supply
· Even after checking Main - Inverter PCB communication
CH52, CH57, CH105
harness(2pin, White) connection condition
CH21, CH22, CH23, CH25, CH26,
· Even after checking R, S, T connection harness condition (Open,
CH23, CH50 CH29, CH40, CH49, CH50, CH52,
Wrong connection) and connection sequence.
CH57, CH60, CH62, CH65, CH71,
CH21 · Even after replacing compressor
CH21, CH26 · Even after checking U, V, W connection condition CH105
· Even after checking EEPROM inserting (direction, pin break, etc.)
CH60
condition.
2. Inverter PCB check
Comm._in Comm._Out Fan_15 V
SMPS
Debugger
Shortkey
LGMV
Micom.
IGBT
Drive IC
Reactor
Film Cap.
Reactor
1.2 주요 불량 원인
· 고전압 인가 (T-N 494 V 이상, N상 오결선) → CH50 발생
Error diagnosis
• 전원 Reset 후 재기동 여부 확인
•Inverter SMPS 전원 인가용 220V 결선 여부
•Main-Inverter 통신 Harness(2pin, White) 결
• 입력 R, S, T 연결 Harness 체결 상태 (Open
• 압축기 교체 후에도 동일 불량 발생 (CH21).
• 압축기 출력 선 U, V, W 체결 상태 ( 미체결 , 덜
•EEPROM 삽입 상태 재확인 ( 방향 , 핀 꺽임 등
W
V
U
T
S
R
Fan DCLink
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