DOWNLOAD LG GR-429GVCA QVJA Service Manual ↓ Size: 3.89 MB | Pages: 60 in PDF or view online for FREE

(1) Automatic diagnosis makes servicing the refrigerator easy.

(2) When a defect occurs, the buttons will not operate: but the tones, such as ding, will sound.

(3) When the defect CODE removes the sign, it returns to normal operation (RESET).

(4) The defect CODE shows on the Refrigerator and Freezer Display.

u

u

NOTE 1) When the SUPER FRZ. button and FRZ. Temp button are pushed and held for 1 second or longer, operates as

follow.

Miracle Zone sensor

RT sensor

- 25 -

1

2

3

4

5

6

Er

Er

Er

Er

NOTE 1)

FS

rS

dS

dH

Failure of Freezer

sensor

Failure of Refrigerator

sensor

Failure of defrost

sensor

Poor of defrost

Failure of RT sensor

Failure of Miracle

Zone sensor

Cut or short circuit wire

Cut or short circuit wire

Cut or short circuit wire

2hours later After starting defrost,
If sensor doesn't be over 8°C

Cut or short circuit wire

Cut or short circuit wire

* Inspect Connecting

wires On each sensor

Snapping of defrost
heater or Temperature
fuse, pull-out of
Connector (indicated
minimum 2 Hours after
failure occurs)

* Inspect Connecting

wires On each sensor

If normal, all graphics at the LCD are on.

If abnormal, the graphics of temp and text of miracle zone at the LCD are off.

If normal, all graphics at the LCD are on.

If abnormal, the graphics of 

, 

at the LCD are off.

1

2

u

u

u

u

NOTE 2) When the SUPER FRZ. button and FRZ. Temp button are pushed and held for 1 second or longer, ERROR CODE

of RT sensor is expressed.

- 26 -

1

2

ERROR

CODE

All off

All off

All off

All off

All off

Failure of Freezer sensor

Failure of Refrigerator sensor

Failure of defrost sensor

Poor of defrost

Failure of RT sensor (NOTE 2)

All off

All off

All off

All off

All off

1

2

3

4

3

: ON

: OFF

: ON

: OFF

(1) Function to check the testing function of PCB and refrigerator and to find where the trouble.

(2) The test switch is on the MAIN PCB of refrigerator.

TEST FUNCTION is released and RESET after MAX. 2hours regardless of TEST MODE.

(3) If the buttons on TOP COVER is pushed during TEST MODE, Function is not operated and only BUZZER ring with

"DING~"

(4) After the end of TEST MODE, pull out the power cord and plug it in again(RESET).

(5) If a ERROR occurs during the TEST MODE, TEST FUNCTION is released and DISPLAY represent ERROR CODE.

(6) If the TEST swithch is pushed during ERROR CODE, TEST FUNCTION is not operated.

- 27 -

• LED/LCD Check Function : Press the SUPER FREEZE and FREEZE TEMP buttons at the same time. After 1 sec., all

the GRAPHICS of the DISPLAY are ON simultaneously. If release the BUTTON, return to the
previous condition.

If DEFROST SENSOR
is over 8°C, it returns
to the NORMAL
STATE.

Comp starts after 7
minutes.

1. Continuous operation of the compressor.
2. Continuous operation of the freezer fan.
3. STEPPING DAMPER OPEN.
4. Defrosting Heater OFF.
5. ALL Graphics ON.
6. Micracle Zone DAMPER CLOSE 

(BEST model)

1. COMP OFF.
2. FREEZER FAN OFF.
3. STEPPING DAMPER CLOSE.
4. Defrosting Heater ON.
5. DISPLAY LCD shows 22 (BEST model)
6. The 1st, 2nd, 3rd LED of DISPLAY is ON 

(BETTER/GOOD model)

Return to the  initial condition. (RESET)

Press TEST button
once.

Press TEST button
once in the state of
TEST MODE 1.

Press TEST button
once in the state of
TEST MODE 2.

TEST 1

TEST 2

NORMAL
STATE

TRANS secondary side is composed of electric power circuits for RELAY driving electricity (12Vdc) and for supplying
electricity to MICOM and IC (5Vdc). The voltage in each part is as follows.

- 28 -

PARTS

VA1

CE3

CE4

VOLTAGE

230Vac

12Vdc

5Vdc

PARTS

VA1

CE1

CE2

CE3

VOLTAGE

230Vac

17Vdc

12Vdc

5Vdc

u

BEST

u

GOOD/BETTER

u

BEST

u

GOOD/BETTER