Samsung DVM S ECO BIG Series Service Manual page 101

■ Error due to overheat caused by contact failure on IPM of inverter PBA 1. (E-500)
Outdoor unit Display
Judgement Method
Cause of problem
Both end resistance values of IGBT module pin(8, 9 pin)
Temperature(°C)
10
20
30
40
50
60
70
80
90
100
105
110
120
130
100
Power Off
IPM (IGBT) module
pin 8, 9 : Is it normally both end
resistance value?
Is the bolt of the heat
sink fully tightened?
Did check the foreign
objects between the
heat sink and IPM?
Did properly apply the
thermal grease ?
Complete
Samsung Electronics
• IGBT module internal temperature : 105°C more than
• Cooling Pin and the IGBT junction part assembly defective.
• Refrigerant cooling heat sink and refrigerant piping assembly defective.
• Assembled bolt defective.
NTC [ohm]
Yes
Yes
Yes
Yes
E-500
9000
6000
4000
3000
2000
1600
1200
750
650
500
450
380
300
250
500
No
Replace Inverter PCB
No
Tighten Bolt ( Screw )
No
Remove foreign objects and apply the thermal
grease and then reassembly.
No
Apply the thermal grease and then reassembly.
Troubleshooting
AD [V]
2.58
2.33
2.03
1.80
1.47
1.29
1.07
0.76
0.68
0.55
0.51
0.44
0.35
0.30
0.55
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