Ice Maker Troubleshooting - LG GR-B197WVS Service Manual

ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR

3. Ice Maker Troubleshooting

* Troubleshooting: it is possible to confirm by pressing freezer and refrigerator temperature control buttons for more
than 1 second. (ice maker is normal if all leds are on): refer to trouble diagnposis function in MICOM
function 2-8 (page 18)
Is DC Power (5V and 12V)
output normal?
Yes
Is cube ice led off during
troubleshooting check?
No
Is Crushed Ice LED off during
troubleshooting check?
No
Are ice
ejection and level return
normal when test switch is
pressed for more than 0.5 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 ice making sensor
• Check the resistance of
both ends (3,4) of ice making
sensor of CON9.
• Defects between ice making
sensor and board
(Pin No. 58 of IC1)
Yes
Failed Ice Maker Unit
• Is the resistance of both ends of
ice ejection motor of CON9
between 18 and 22 ?
• Is ice ejection motor drive circuit
(IC11 and peripheral circuits)
normal?
• Defects between Hall IC and
Board (Pin No. 44 of IC1).
• Confirm ice ejection and level
return when pressing
test switch.
No
Failed ice maker unit test switch
• Are both ends of CON9 test
switch open?
• Defects between test switch
and board (Pin No. 45 of IC1).
• Are both ends (5,6) of CON9
ice maker 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?
- 63 -
Change main PWB
Replace Ice making
Sensor
Replace Ice Maker Unit
Replace Main PWB
Replace Ice maker Unit
Replace water
supply valve