Icemaker Troubleshooting - LG GR-B197GVQ Service Manual

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
diagnposis
function in MICOM function
2-8
(page 18)
ICEMAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD
-62-
No
Yes
Yes
Yes
No
No
No
No
Yes
Yes
Is DC Power
(5V and 12V)
output
normal?
Failed DC Power
?
Check DC power
(5V, 12V).
Change
main PWB
Is cube ice LED off
during
troubleshooting
check?
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)
Replace Icemaking
Sensor
Is Crushed ice LED off
during
troubleshooting
check?
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.
Replace
Icemaker Unit
Replace Main PWB
Are ice
ejection
and level
return
normal when test switch is
pressed
for
more
than 0.5 second?
Does the bell
sound once?
Failed icemaker unit
test
switch
?
Are both ends
5,6
of CON9
test
switch
open?
?
Defects between
test
switch
and board (Pin
No. 43 of
IC1).
?
Are both ends
(3,4)
of CON9
icemaker
stop
switch short?
Replace
Icemaker Unit
Replace water
supply
valve
?
Is power
applied
to water
supply
valve?
?
Does the
water supply
valve work
normally?
?
Is the
water supply
line
normally
connected?
Poor
water supply
Is
water
suppy normal
after ice
ejection
and level
return
by
ice
ejection
motor?
Normal