Samsung RB31FEJNB Series Service Manual page 72

4. TROUBLESHOOTING
4-2-9) When the Compressor is not working (INVERTER PBA) A+++
When the inverter PBA LED
is ON, it indicates that the
compressor does operate
normally
Refer to the TEST Function in
this manual
Forced Operation signal sound
should be checked
0~800Hz 50% Duty
Signal Output
Check the wire harness
Replace the MAIN PBA
Replace INVERTER PBA
Start
10 minutes have
passed since COMP
was off
Yes
When Forced
Operation mode is activated,
COMP operates
Yes
Yes
COMP operation
No
Signal(CN201 ②↔③) is High(about DC
2-2.5V or AC 0~5.0V)
Yes
No
Is DC 15V applied to
ZD501?
Yes
CN101/CN102/CN301
Connector is Good
Yes
COMP ASS'Y is Good
Yes
NORMAL (Recheck)
☞ SMPS Primary Voltage checking(+15V) : ZD501:At both
Terminals DC15V±1.5V
No
Check in 10 minutes
No
Temperature Sensor is
normal?
Temperature sensing
part of MAIN PBA is
Good
Replace MAIN PBA or
Repair the connection
No
Check the COMP wire
Check the Compressor
Check AC Power wire
No
Replace COMP ASS'Y
72
No
Replace the Sensor
Yes
No
Repair the sensing part or
Yes
Replace MAIN PBA