Samsung AG042KSVANH Service Manual page 74

IPM breakdown diagnostics (FAN PCB)
1. Preparations before checking
1) Power Off
2) IPM failure, discharge mode may not work properly. Therefore, wait more than 15 minutes after the Power Off.
3) Remove all of the Fan PCB connectors. (Comp connector included)
4) Prepare the digital multi tester.
2. Inspection Method
1) Refer to Figure1 and Table1, respectively the resistance value and diode voltage value measure.
2) According to the criterion in Table 1 to determine whether the failure of IPM.
Division
Measure
the resistance values
Measure the diode
voltage values
Measured Point
+ -
40 U
40 V
40 W
U 34
V 34
W 34
U 40
V 40
W 40
34 U
34 V
34 W
< Figure 1 >
Criterion
More than 3
Measurement error can occur for reasons such as the initial
0.3~0.7V
< Table 1 >
70
Remark
measurement condenser discharge.
Measured over at least three times.