Case Study - Poor Cooling Caused By Ipm Overheated - Samsung AM080FX A Series Service Manual

Troubleshooting
4-4 Case study for trouble shoots (cont.)
4-4-13 Case study – Poor cooling caused by IPM overheated
- Problem : Poor cooling
- Condition : Compressor frequency doesn't increase, IPM temperature is too high, Low pressure is high
- History
: 13.05.07 Trial operation
: 13.05.27 Inverter PBA, EMI PBA, Reactor replacement
: 13.05.27 IPM temperature ↑ → comp Hz ↓→cooling capacity↓
Test
Upper PBA
(inv 2)
Lower PBA
(inv 1)
- Root cause : Bad contact of IPM cause by faulty bolt.
IPM1
IPM
Heat sink
Samsung Electronics
5/27
upper PBA change
PBA_A
freq. 55hz freq. 54hz
IPM 89℃ IPM 82℃
PBA B
freq. 52hz freq.51hz
IPM 86℃ IPM 92℃
5/28
case 1 case 2
lower PBA change
PBA C PBA C
freq. 55hz
IPM 79℃
PBA B CB D
freq. 52hz
IPM 91℃
IPM2
There is no thermal grease.
case 3
exchange PBA position
each other
PBA D
freq. 55hz
IPM 81℃
PBA C
freq. 52hz
IPM 89℃
IPM 2- Reattach
242