Fan Pcb - LG MULTI V 5 Manual Book

15.2 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 Fan motor / PCB / Diode / Resistance / Capacitor / Regulator
15.3 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. Be sure to apply thermal grease.
5. When IGBT screw is fastened, it should be fastened two times.
6. If on-boarding is required after replacement, check the program and EEPROM C/Sum
(especially when using an alternate Main PCB)
15.3 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. Over current error check (CH29)
4. Check that compressor 1 and 2 are properly connected.
5. Check that the target high / low pressure is reached.
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16. Fan PCB

16.1 Failure Judge Method
18. Fan PCBA
1. Error code check
Error Code
1.1 불량 판단 방법
- · Checking restart after power reset
· Even after checking 220V connection condition for Inverter SMPS
CH105
power supply
에러 코드
· Even after checking DC_Link P, N connection harness assembly
• 전원 Reset 후 재기동 여부 확인
CH76, CH107
condition (Open, Wrong connection)
•Inverter SMPS 전원 인가용 220V 결선 여부 확인 후에도 동일 Error 발생 (
CH67, CH77, CH79,
· Even after replacing fan motor
CH77, CH106
CH87, CH105, CH106, •DC_Link P, N단 연결 Harness 체결 상태확인 후에도 동일불량 발생(CH7
· Even after fan motor connector misconnection(U, W, V output)
CH107, CH193, CH194
•FAN Motor 교체 후에도 동일 불량 발생 (CH77, CH106)
2. Inverter PCB check
•FAN 출력 선 U, V, W 체결 상태 확인 후에도 동일불량 발생(CH77, CH10
PCB 간 통신 및 On-boarding
전원 15 V 입력
15V Comm.
Comm..
Fan1 U, V, W Output
Fan2 U, V, W Output
1.2 주요 불량 원인
· 고전압 인가 (T-N 494 V 이상, N상 오결선) → CH50 발생
· 팬 내부 모터 절연 파괴
· 물 침투(컨트롤박스 프론트 판넬 열림, 서비스창 열림, 컨트롤박스 스크류 풀림 으로 인한
· 이물질 침투에 의한 부품 Short, Open
· PCBA 제작 불량
· Diode, 저항, Capacitor, Regulator 등 단품 불량
Error diagnosis
불량 여부 판단
Debug
MICOM
DCLINK
IPM
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