LG AMNW07GDBL1 Service Manual page 74

Display
Title
code
62 Heat Sink High
■ 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
VSS VSS VSS
VFO VFO
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Only for training and service purposes
Cause of error
Inverter PCB heatsink tem-
perature 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 between NO.14 pin and
NO.16 pin of IPM module
No
• 85kΩ ± 6.3% (at 25℃)
• Replace main PCBA it abnormality found
- 73 -
Part 5. Trouble Shooting
Check point & Normal condition
• ODU fan locking
• Heatsink assembly of INV PCB assemble condi-
tion abnormal
• Defect of temperature sensing circuit part defect
of INV PCB
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