Samsung RS757LHQESR/ Series Service Manual page 54

DISASSEMBLY AND REASSEMBLY
3) Troubleshooting based on LED Blinking Frequency
When failure is detected by the Inverter PCB, the Compressor will immediately stop if the
Compressor is running and there will be a 5 minute standby. During the 5 minute standby, RPM
signals will be ignored.
That is, even though the Inverter PCB receives the RPM signals, the Compressor does not work.
It blinks every second and there is 2 second off at the end of each cycle.
LED Blinking Frequency Protecting Functions
Normal Operation
1. Check the COMP terminals short(U,V,W)
Starting Failure
2. Check IPM Pins short of Inverter PBA
3. Check IPM operating Voltage(under DC 13.5V)
IPM Fault
4. Other cases, check the COMP, cycle, etc.
1. Check COMP wire connections(U,V,W)
Abnormal Current
2. Check PCB Bottom side soldering state
Detection
3. Other cases, check the COMP, cycle, etc.
1. Check PCB Bottom side soldering state.
Motor Locked / Over
2. Check Input voltage oscillation
RPM
3. Other cases, check the COMP, cycle, etc.
1. Check input voltage under
AC 53V(Input Power AC110 ~ 127V) or
Under Voltage
AC 106V(Input Power AC220 ~ 240V)
2. Check PCB Bottom side soldering sate.
1. Check input voltage over
AC 155V(Input Power AC110 ~ 127V) or
Over Voltage
AC 310V(Input Power AC220 ~ 240V)
2. Check PCB Bottom side soldering sate.
53
Remarks
N/A