DOWNLOAD LG GR-P207DTU Service Manual ↓ Size: 8.05 MB | Pages: 127 in PDF or view online for FREE

Model
GR-P207DTU
Pages
127
Size
8.05 MB
Type
PDF
Document
Service Manual
Brand
Device
Refrigerator
File
gr-p207dtu.zip
Date

LG GR-P207DTU Service Manual ▷ View online

2-1-2. LCD Back Light Control
1. In order to easily view display status on the LCD, LCD Back Light is turned on for a minute in application of initial power,
for a minute in button manipulation and for a minute after closing time from opening time of door. 
2. If pressing any display button once with the backlight turned off, buzzer rings and button function is not performed but
only backlight is turned on (If pressing the first button with the back light turned off, only back light ON function is
performed). 
3. If pressing the special freezing button and the freezing temperature adjustment button for more than a second, the back
light is turned on and all the graphics of LCD are turned on. If releasing the button, the LCD graphic is displayed in the
previous status and the back light is turned off (check LCD graphic and back light ON/OFF status).
2-1-3. Outside temperature display function
1. Outside temperature sensor at the left U of refrigerator senses ambient temperature and displays the outside temperature
in the left side of “Outside temperature” text on the LCD of the display part. 
2. Ambient temperature is displayed up to -9°C ~ 49°C and displayed as “Lo” for less than -10°C and as “HI” for more than
50°C. If the ambient temperature sensor fails, it is displayed as “Er”. 
3. Since display temperature of outside temperature is temperature sensed by the ambient sensor in the hinge U of the
freezing room, it may differ from the outside temperature display of other household electrical appliances. 
2-1-4. Lock function (display button lock)
1. In power application of refrigerator, the only “Release” text is turned on at the right side of lock graphic of LCD with the
lock release status. 
2. If desiring to lock the display status and pressing the lock/release button once, “Release” text is turned off at the right side
of lock graphic of LCD and “Lock” text is turned on with lock status.
3. The only buzzer sound rings and function is not performed even if pressing display button other than lock/release key in
the lock status. 
4. If desiring to release the lock status and pressing the lock/release button once, “Lock” text is turned off at the right side of
lock graphic of LCD and “Release” text is turned on with lock release status.
2-2. Dispenser use selection
You can select water or ice. 
Please select water, slice ice and square ice by pressing
button as you desire. 
Please press the push button lightly by catching and pushing in cup. 
• The border line is indicated for the selected function.
• “Tak!” sounds if 5 seconds pass after ice comes out. 
It is sound that the outlet of ice is closed. 
REFERENCE : Please wait for 2-3 seconds in order to take final ice
slices or drops of water when taking out cup from the
pressing switches after taking ice or water. 
2-3. Automatic ice maker
• The automatic ice maker can automatically make 8 pieces of ice cube at a time, 80 pieces a day. But these quantities may
be varied according to various conditions including how many times the refrigerator door opens and closes. 
• Ice making stops when the ice storage bin is full. 
• If you don’t want to use automatic ice-maker, change the ice-maker switch to ON-OFF.
If you want to use automatic ice-maker again, change the switch to OFF-ON.
NOTE : It is normal that a noise is produced when ice made is dropped into the ice storage bin.
MICOM FUNCTION
- 26 -
DISPENSER
CRUSHED
CUBED
WATER
MA
X
MIN
MAX
MIN
Pressing 
Switch
DISPENSER
2-4. When ice maker does not operate smoothly
Ice is lumped together
• When ice is lumped together, take the ice lumps out of the ice storage bin, break them into small pieces, and then place
them into the ice storage bin again. 
• When the ice maker produces too small or lumped together ice, the amount of water supplied to the ice maker need to
adjusted. Contact the service center. 
If ice is not used frequently, it may lump together. 
Power failure
• Ice may drop into the freezer compartment. Take the ice storage bin out and discard all the ice then dry it and place it
back. After the machine is powered again, crushed ice will be automatically selected. 
The unit is newly installed
• It takes about 12 hours for a newly installed refrigerator to make ice in the freezer compartment. 
2-5. Super freezer
Please select this function for prompt freezer. 
• “On” or “Off” is repeated whenever pressing          button. 
• The arrow mark graphic remains at the On status after flickering 4 times when
selecting Special Refrigeration “On”.
• Super freezer function automatically turns off if a fixed time passes.
2-6. Lock
This button stops operation of different button.
• Locking or Release is repeated whenever pressing the          .
• Pressing the other button when selecting ‘LOCK’, the button does not operate. 
2-7. Special freezing
1. Special freezing is function to improve cooling speed of the freezing room by consecutively operating compressors and
freezing room fan. If pressing the special freezing button, “Turn Off” text of the LCD panel is turned off and “Turn On” is
immediately turned on and “Arrow (         )” graphic is turned on after flickering once.
2. Special freezing is cycled in order of Selection/ Release (“Turn On” / “Turn Off”) whenever pressing the selection button. 
3. Special freezing is released if power failure occurs and then returns to the original status.
4. Temperature setting is not changed even if selecting the special freezing.
5. The change of temperature setting at the freezing room or the cold storage room is allowed with special freezing selected
and processed. 
6. The cold storage room operates the status currently set with special freezing selected and processed. 
7. If selecting the special freezing, the special freezing function is released after continuously operating compressor and
freezing room fan. 
8. If frost removal starting time is arrived during special freezing, special freezing operation is done only for the remaining
time after completion of frost removal when the special freezing operation time passes 90 minutes. If passing 90 minutes,
special freezing operation is done only for 2 hours after completion of frost removal. 
9. If pressing special freezing button during frost removal, the special freezing LCD is turned on but if pressing the special
freezing, compressor operates after the remaining time has passed.
10. If selecting special freezing within 7 minutes (delay for 7 minutes of compressor) after the compressor stops,
compressor operates after the remaining time has passed.
11. The freezing room fan motor operates at the high speed of RPM during operation of special freezing.
MICOM FUNCTION
- 27 -
Ex) In selecting
"On" 
Ex) In selecting
"Off" 
SUPER FRZ
ON
OFF
ON
OFF
Ex) In selecting
"LOCK" 
Ex) In selecting
"LOCK" again
LOCK
LOCK
LOCK
LOCK
SUPER FRZ
2-8. Control of variable type of freezing room fan
1. To increase cooling speed and load response speed, MICOM variably controls freezing room fan motor at the high speed
of RPM and standard RPM.
2. MICOM only operates in the input of initial power or special freezing operation or load response operation for the high
speed of RPM and operates in the standard RPM in other general operation.
3. If opening doors of freezing / cold storage room or home bar while fan motor in the freezing room operates, the freezing
room fan motor normally operates (If being operated in the high speed of RPM, it converts operation to the standard
RPM). However, if opening doors of freezing room or home bar, the freezing room fan motor stops. 
4. As for monitoring of BLDC fan motor error in the freezing room, MICOM immediately stops the fan motor by determining
that the BLDC fan motor is locked or poor if there would be position signal for more than 65 seconds at the BLDC motor.
Then it displays failure (refer to failure diagnosis function table) at the display part of refrigerator, performs re-operation in
the cycle of 30 minutes. If normal operation is performed, poor status is released and refrigerator returns to the initial
status (reset).
2-9. Control of M/C room fan motor
1. The M/C room fan motor performs ON/OFF control by linking with the COMP.
2. It controls at the single RPM without varying RPM. 
3. Failure sensing method is same as in fan motor of freezing fan motor (refer to failure diagnosis function table for failure
display).
2-10. Door opening alarm
1. Buzzer generates alarm sound if doors are not closed even when more than a minute consecutively has passed with
doors of freezing / cold storage room or home bar opened.
2. Buzzer rings three times in the interval of 0.5 second after the first one-minute has passed after doors are opened and
then repeats three times of On/Off alarm in the cycle of every 30 seconds.
3. If all the doors of freezing / cold storage room or home bar are closed during door open alarm, alarm is immediately
released.
2-11. Ringing of button selection buzzer
1. If pressing the front display button, “Ding ~ “ sound rings.
2-12. Ringing of compulsory operation, compulsory frost removal buzzer
1. If pressing the test button in the main PCB, “Phi ~ “ sound rings.
2. In selecting compulsory operation, alarm sound is repeated and completed in the cycle of On for 0.2 second and Off for
1.8 second three times.
3. In selecting compulsory frost removal, alarm sound is repeated and completed in the cycle of On for 0.2 second , Off for
0.2 second, On for 0.2 second and Off for 1.4 second three times.
MICOM FUNCTION
- 28 -
Doors of freezing / 
cold storage room 
or home bar 
BUZZER
Closing
Opening
Within
a minute
A minute
30
seconds
30
seconds
30
seconds
Opening
Closing
Closing
3 Times 3 Times 3 Times 3 Times
2-13. Frost removal function
1. Frost removal is performed whenever total operation time of compressor becomes 7 ~ 7.5 hour.
2. In providing initial power (or returning power failure), frost removal starts whenever total operation time of compressor
becomes 4 ~ 4.5 hour.
3. Frost removal is completed if temperature of a frost removal sensor becomes more than 5°C after starting frost removal.
Poor frost removal is not displaced if it does not arrive at 5°C even if two hours have passed after starting frost removal.
4. No removal is done if frost removal sensor becomes poor (snapping or short-circuit).
2-14. Sequential operation of built-in product
Built-in products such as compressor, frost removal heater, freezing room fan, Cooling Fan and step motor damper are
sequentially operated as follows for preventing noise and part damage occurred due to simultaneous operation of a lot of
parts in applying initial power and completing test.
MICOM FUNCTION
- 29 -
Function
Load Operation Sequence
Remark
In
applying
Initial
power
TEST
MODE
When temperature
of a frost removal
sensor becomes
more than 25°C  
(In purchase,
movement)
If error occurs
during operation,
initial operation is
not done.
If pressing switch
once more in the
test mode 2 or
temperature of a
frost removal
sensor is more
than 5°C, it
immediately
returns to the test
mode for initial
operation 
(COMP operates
after 7 minutes). 
When
temperature of a
frost removal
sensor becomes
less than 25°C 
(In power failure,
service)
Test mode 1 
(Compulsory
function)
Test mode 2 
(Compulsory frost
removal)
POWER
ON
COMP
ON
COMP
ON
WATER
TANK
HEATER
ON
WATER
TANK
HEATER
OFF
STEP
MOTOR
DAMPER
ON
STEP
MOTOR
DAMPER
OPEN
STEP
MOTOR
DAMPER
CLOSE
HOME
BAR
HEATER
ON
POWER
ON
FROST
REMOVAL
HEATER
ON
HOME
BAR
HEATER
OFF
HOME
BAR
HEATER
ON
TEST
S/W
(Press
Once)
COMP
ON
TEST
S/W
(Press
2 times)
COMP
OFF
0.5
sec.
0.3
sec.
0.3
sec.
0.3
sec.
0.5
sec.
8
sec.
0.3
sec.
5
sec.
FROST
REMOVAL
HEATER
OFF
5
sec.
0.3
sec.
WATER
SUPPLY
&
DISPENSE
HEATER
ON
5
sec.
0.3
sec.
0.3
sec.
0.3
sec.
0.3
sec.
0.3
sec.
0.3
sec.
0.3
sec.
0.3
sec.
OTHER
LOAD
OFF
F-FAN
&
C-FAN
ON
F-FAN
&
C-FAN
ON
F-FAN
&
C-FAN
ON
F-FAN
&
C-FAN
OFF
FROST
REMOVAL
HEATER
ON
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