LG LFXS32726 Series, Service Manual

Page: 86 / 110

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11-1 Check A
- There is PC Board located in the PCB case.
The control driver is PC board for the compressor.
- This step shows the source voltage of the driver PC board.
* Driver PCB located in machine room.
Step1. Open PCB Cover Step2. Check Driver PCB
LED Lamp
Checking PCB Output
IPM Output check
Check the voltage that the PCB supplies to the compressor.
A-Inverter
Check the PCB output voltage to determine whether the PCB functions
normally.
Normal: The voltage of
£
(COMMON, POWER) or
¤
(COMMOM, SAVE)
should be 80 V or above.
Multi
Tester
ྙ
ྚ
ྙ
ྚ
Checking PCB Failure
Check if the fuse is disconnected. If the fuse is okay, check the voltage of DC link terminal.
Check the low voltage terminal.
ྜ
Check if the LED blinks.
Check the measures depending on the number of
LED blinks.
ྙ
Check the fuse (disconnection).
ྚ
Check the voltage of DC link terminal.
(Multi Tester)
Spec. approx. 310 V DC
GND
Voltage
ྛ
Check the low voltage terminal.
(Multi Tester)
Spec. A Point 15V
B Point 5V
#
$