LG AUUQ18GH1 Svc Manual page 88

Display
Title
code
Heatsink High error
62
n Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal ?
Yes
Is assemble condition
of INV PCB heatsink normal ?
Yes
Is PCB temperature
sensing part normal ?
Yes
Recheck installation condition
and connection of Heat sink
Model
AUUQ18GH1 /AUUQ21GH1/ AUUQ24GH1
(ATUQ18GPLE3/ ATUQ21GPLE3/ ATUQ24GNLE3)
(AVUQ18GJLA0/ AVUQ21GJLA0 / AVUQ24GJLA0)
(ABUQ18GHLA0/ ABUQ21GHLA0/ ABUQ24GGLA0)
(ABUQ18GL2A0/ ABUQ21GL2A0/ ABUQ24GL3A0)
AUUQ36GH1
(ATUQ36GMLE3)
(AVUQ36GKLA0)
(ABUQ36GGLA0)
AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1
(ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3)
(AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0)
(ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0)
Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Cause of error
Inverter PCB heatsink
temperature is over 85°C
1. Check fan locking
2. Check covering of heat exchanger
3. Check distance between ODU and obstacles
No
4. Check pipe distortion and abnormality
5. Check service valve is opened
→ Eliminate causes for abnormal condition
Check assemble condition between INV PCB heatsink and
No
PFC & IPM module → Reassemble if abnormality found
Check resistance
No
→ Replace PCB if abnormality found
check point
NO.14 pin and NO.16 pin
of IPM module
NO.19 pin and NO.20 pin
of PCB PFC module
- 88 -
Part 4 Trouble Shooting
Check point & Normal condition
1. ODU fan locking
2. Heatsink assembly of INV PCB assemble condi-
tion abnormal
3. Defect of temperature sensing circuit part defect
of INV PCB
85kΩ ± 6.3% (25°C)
50kΩ ±10% (25°C)
Normal resistance
LGE Internal Use Only