LG AMNW07GDBL1 Service Manual page 75

Part 5. Trouble Shooting
Display
Title
code
65 Heatsink Sensor error
■ 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
Copyright ©2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Cause of error
Inverter PCB heatsink sen-
sor is open or short
No
No
No
VSS VSS VSS
VFO VFO
Check point & Normal condition
• ODU fan locking
• Heatsink assembly of INV PCB assemble
condition abnormal
• Defect of temperature sensing circuit part defect
of INV PCB
1. Check fan locking
2. Check covering of heat exchanger
3. Check distance between ODU and obstacles
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
PFC & IPM module
-> Reassemble if abnormality found
Check resistance between NO.14 pin and NO.16 pin of IPM
module
• 85kΩ ± 6.3% (at 25℃)
• Replace main PCBA it abnormality found
- 74 -
LGE Internal Use Only