DOWNLOAD LG GR-B-L207EC-ER Service Manual ↓ Size: 5.21 MB | Pages: 127 in PDF or view online for FREE

* 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)

- 56 -

No

Yes

Yes

Yes

No

No

No

No

Yes

Yes

Is DC Power (5V and 12V) 

output normal?

• Check DC power (5V, 12V).

Change main PWB

Is cube ice led off during

troubleshooting check?

• 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)

Replace Ice making
Sensor

Is Crushed Ice LED off during

troubleshooting check?

• Is the resistance of both ends of

ice ejection motor of CON9 
between 18 and 22

Ω

?

• 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.

Replace Ice Maker 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?

• 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?

Replace Ice maker 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?

Is water suppy normal

after Ice ejection and level return

by ice ejection motor?

Normal

The above ice maker circuits are applied to GR-P247, GR-P207 and GR-L247, GR-L207 and composed of ice maker unit in
the freezer and ice maker driving part of main PWB. Water is supplied to the ice maker cube mould through the solenoid
relay for ice valve of solenoid valve in the machine room by opening valve for the set time. Water supply automatically stops
when water supply time is elapsed. This circuit is to realize the functions such as ice ejection of ice maker cube mould, ice
full detection, leveling, ice making temperature detection, etc. Refer to the temperature detecting circuits of Main PWB for
ice making temperature detection. Ice maker test switch input detection is the same as the door switch input detection circuit
of main PWB.

1. It is to force to operate during operation test, service, and cleaning. The test switch is mounted under the automatic ice

maker. The test function starts when the test switch is pressed for more than 0.5 second.

2. Test button does not work during ice ejection and water supply. It works when it is in the horizontal conditions. If cube

mould is full of ice during test function operation, ice ejection control and water supply control do not work.

3. Ice ejection carries out irrespect of ice formation in the ice making tray if test switch is pressed for more than 0.5 second.

Water shall be splashed if test switch is pressed before the water in the mould is completely frozen. Water shall be
supplied while the mould returns to the horizontal conditions after ice ejection. Therefore the problems of ice ejection,
leveling, and water supply can be checked by test switch. When test function performs normally, buzzer sounds and water
supply shall carry out. Check it for repair if buzzer does not sound. 

4. When water  supply is  completed, normal  cycle works:  Ice Making 

→

Ice Ejection 

→

Level Return 

→

Water Supply.

5. If ice maker stop switch is set to ON, normal cycle operates: Ice Making 

→

Ice Ejection 

→

Level Return 

→

Water Supply. 

If  it is set to OFF, ice making conducts but ice ejection, level return, and water supply do not work.

- 57 -

FOWARD

REVERSE

ICE MAKER
STOP SWITCH

- 44 -

TRANS

VA1

CON1

DIP

CE1

D2

D4

CM1

CM2

IC2

IC3

CC2

CC1

CC7

CC3

IC1

IC4

J21

J22

CC5

OSC1

R1

CC4

R2

J23

IC5

60

55

50

45

40

35

5

10

15

202

53

0

CE5

D5

R16

CE2

CE3

D3 D1

1

BUZZER

Q4

Q5

R29

R30

J06

CE6

J07

CON7

CON6

R1/S

F/S

D/S

FD/SW

R2/S

RD/SW

DAMP/HTR

STEP/M

TEST

R25

J08

R17

J09

J10

J19

J20

R21

RR1

RR2

J03

J04

RF1

J05

RD1

R31

J01

J18

J24

J30

R32

J27

J11

IC6

CE7

2

D8

D7

D9

D10

D13

J28

RY8

RY8

CON4

R-LAMP

H/BAR

FAN-STD

FAN-HGH

RY7

RY3

RY4

VA2

D12

D11

J02

CC12

R23

CC11

R22

CC8

R18

CC9

R19

R3

RCF1

R4

RCR1

CC13

R24

        J12

        CC10

        R20

        J13

        J14

        R28

        J15

        R27

        J16

        R26

JCR1

R8

R7

R6

R5

R10

R9

RT1

R15

J17

CON5

CC6

JCR2

JCR3

JCR4

OP1

OP2

STICKER

RY6

J29

RY3

RY2

FUSE 250V/15A (OPTION)

J26

J25

D6

RY1

6871JB1071

CON3

HTR-DEFROST

COM

N-CLOSE

COM  N-OPEN

COMP/FAN-COOL

CON2

- 47 -

JCR1

JCR2

JCR3

JCR4