Icemaker Troubleshooting - LG LSC26905TT Service Manual

ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR

3. Icemaker Troubleshooting

* Troubleshooting: it is possible to confirm by pressing freezer and refrigerator temperature control buttons for more than 1
second. (icemaker is normal if all LEDs are on): refer to trouble diagnosis function in MICOM function 2-
8 (page 21)
Is DC Power (5V and 12V)
output normal?
Yes
Is cube ice LCD off during
troubleshooting check?
No
Is Crushed Ice LCD off during
troubleshooting check?
No
Are ice
ejection and level return
normal when test switch is
pressed for more than 1/2 second?
Does the bell
sound once?
Yes
Is water suppy normal
after Ice ejection and level return
by ice ejection motor?
Yes
Normal
No
Failed DC Power
• Check DC power (5V, 12V).
Yes
Failed icemaking sensor
• Check the resistance of
both ends (1,2) of icemaking
sensor of CON9.
• Defects between icemaking
sensor and board
(Pin No. 60 of IC1)
Yes
Failed Icemaker Unit
• Is the resistance of both ends
(9,10) of ice ejection motor of
CON9 between 18 and 22Ω?
• Is ice ejection motor drive circuit
(IC11 and peripheral circuits)
normal?
• Defects between Hall IC and
Board (Pin No. 42 of IC1).
• Confirm ice ejection and level
return when pressing
test switch.
No
Failed icemaker unit test switch
• Are both ends (5,6) of CON9
test switch open?
• Defects between test switch
and board (Pin No. 38 of IC1).
• Are both ends (3,4) of CON9
icemaker stop switch short?
No
Poor water supply
• Is power applied to water
supply valve?
• Does the water supply
valve work normally?
• Is the water supply line
normally connected?
- 91 -
Change main PWB
Replace Icemaking
Sensor
Replace Icemaker Unit
Replace Main PWB
Replace Icemaker Unit
Replace water
supply valve