Inverter Pba Ipm Overheating Error - Samsung AM080FX A Series Service Manual

Troubleshooting
4-3 Appropriate Measures for Different Symptom (cont.)

4-3-54 Inverter PBA IPM overheating error

Outdoor unit
display
Judgment
- Inverter PBA IPM internal temperature is more than 105°C.
Method
- Heat sink and the IPM surface contact
assembly defective.
Cause of
- Refrigerant cooling heat sink and
problem
refrigerant piping assembly defective.
- Assembled bolt defective..
1. Cause of problem
Power Off
IPM (IGBT) module
pin 8, 9 : Is it normally both end resistance value?
(Refer to table1)
Is the bolt of the heat sink fully tightened?
Did check the foreign objects between the heat
sink and IPM?
Did properly apply the heat sink grease?
(Between the heat sink and the IPM)
Complete
Samsung Electronics
(INVERTER1 PBA)
(INVERTER2 PBA)
Yes
Yes
Yes
Grease Service Code : DB81-02483A
Yes
Table 1
Both end resistance values of IGBT module pin(8, 9 pin)
Temperature [°C]
10
20
30
40
50
60
70
80
Measure the resistance after the power is turned off.
* Enforce the discharge mode before Power Off.
(K2 : press the 6 times)
No
Replace Inverter PBA.
: E500(Bottom), E400 (Top)
IGBT module pin 8, 9
No
Tighten Bolt(Screw)
No
Remove foreign objects and apply the heat
sink grease. And then reassembly
Apply the heat sink grease and then
No
reassembly.
Good
NTC [ohm]
9000
6000
4000
3000
2000
1600
1200
750
No Good
219