LG GA-449 Service Manual ▷ View online
4. SERVICE DIAGNOSIS CHART
- 17 -
COMPLAINT
POINTS TO BE CHECKED
REMEDY
Cooling is
• Is the power cord unplugged from the outlet?
• Plug to the outlet.
impossible.
• Check if the power switch is set to OFF.
• Set the switch to ON.
• Check if the fuse of power switch is shorted.
• Replace a regular fuse.
• Measure the voltage of power outlet.
• If voltage is low, wire newly.
Cooling ability
• Check if the set is placed close to wall.
• Place the set with the space of about 10cm.
is poor.
• Check if the set is placed close to stove, gas
• Place the set apart from these heat
•
cooker and direct rays.
•
appliances.
• Is the ambient temperature high or
• Make the ambient temperature below.
•
the room door closed?
• Check if put in is hot.
• Put in foods after cooled down.
• Did you open the door of the set too often
• Don't open the door too often and close
•
or check if the door is closed up?
•
it firmly.
• Check if the Damper Control is set to "cold-position".
• Set the control to mid-position.
Foods in the
• Is foods placed in cooling air outlet?
• Place foods in high temperature section.
Refrigerator
•
(Front Part)
are frozen.
• Check if the control is set to "cold-position".
• Set the control to "mid-position".
• Is the ambient temperature below 5°C?
• Set the control to "warm-position".
Dew or ice
• Is liquid food stored?
• Seal up liquid foods with wrap.
forms in the
• Check if put in is hot.
• Put in foods after cooled down.
chamber of
• Did you open the door of the set too
• Don't open the door too often and close
the set.
•
often or check if the door is closed up.
•
it firmly.
Dew forms
• Check if ambient temperature and humidity
• Wipe dew with a dry cloth. This occurrence
in the Exterior Case.
of surroumcling air are high.
•
is solved naturally in low temperature and humidity.
• Is there gap in the door packed?
• Fill up the gap.
Abnormal
• Are the set positioned in a firm and even place?
• Adjust the Adjust Screw, and position
noise generates.
•
in the firm place.
• Are any unnecessary objects set
• Remove the objects.
•
in the back side of the set?
• Check if the Tray Drip is not firmly fixed.
• Fix it firmly on the original position.
• Check if the cover of mechanical room
• Place the cover at the original position.
•
in below and front side is taken out.
To close the door
• Check if the door packing is dirty
• Clean the door packing.
is not handy.
•
with filth such as juice.
• Is the set positioned in a firm and even place?
• Position in the firm place and adjust the
•
Adjust Screw.
• Is too much food putted in the set?
• Keep foods not to reach the door.
Ice and foods
• Check if the inside of the set is dirty.
• Clean the inside of the set.
smell unpleasant.
• Did you keep smelly foods without wrapping?
• Wrap smelly foods.
• It smells of plastic.
• The new products smells of plastic, but it is
•
eliminated after 1-2 weeks.
●
In addition to the items described left, refer to the followings to solve the complaint.
Check Refrigerating
Cycle.
Cycle.
The cycle
is faulty.
is faulty.
Repair the cycle.
5. REFRIGERATING CYCLE
- 18 -
▼ Troubleshooting Chart
▼ Leakage Detection
●
Observe discharging point of refrigerant which may be in the oil discharging part in the compressor and hole of evaporator.
YES
YES
Whether Compressor
runs or not.
runs or not.
Whether frost
forms or not in
Evaporator.
forms or not in
Evaporator.
Observe the discharged
amount of Refrigerant.
amount of Refrigerant.
Inject Refrigerant to Compressor
and check cooling operation.
and check cooling operation.
Clogged by dust.
Gas leakage.
Faulty
Compressor.
Compressor.
Moisture Clog.
Whether oil
leaks or not.
leaks or not.
Frost formed normally
Normal amount
No or much amount
(Check the leakage point)
Frost formed normally
No frost
or forms
or forms
in inlet only
Check Compressor
PARTIAL
Freezer room and
Low flowing sound of
A little high
• A little Refrigerant
LEAKAGE
Refrigerator
Refrigerant is heard and
more than
•
discharges.
don't cool
frost forms in inlet only
ambient
• Normal cooling is possible
normally.
temperature.
•
when injecting of Refrigerant
•
the regular amount.
WHOLE
Freezer room and
Flowing sound of Refrigerant
Equal to ambient
• No discharging of Refrigerant.
LEAKAGE
Refrigerator
is not heard and frost isn't
temperature.
• Normal cooling is possible
don't cool
formed.
•
when injecting of Refrigerant
normally.
•
the regular amount.
PARTIAL
Freeze room and
Flowing sound of Refrigerant
A little high
• Normal discharging of
CLOG
Refrigerator
is heard and frost forms
more than
•
refrigerant.
don't cool
in inlet only.
ambient
• The capillary tube is faulty.
normally.
temperature.
WHOLE
Freezer room and
Flowing sound of Refrigerant
Equal to ambient
• Normal discharging of
CLOG
Refrigerator
is not heard and frost isn't
temperature.
•
Refrigerant.
don't cool.
formed.
MOISTURE
Cooling operation
Flowing sound of Refrigerant
Low than
• Cooling operation restarts
CLOG
stops periodically.
is not heard and frost melts.
ambient
•
when heating the inlet of
temperature
•
capillary tube.
COMP-
Freezer and
Low flowing sound of
A little high
• The pressure of high
RESSION
Refrigerator
Refrigerant is heard and
than ambient
•
pressure part in
don't cool.
frost forms in inlet only.
temperature.
•
compressor is low.
NO COMP-
No compressing
Flowing sound of Refrigerant
Equal to ambient
• No pressure of high pressure
RESSION
operation.
is not heard and no frost.
temperature.
•
part in the compressor.
CAUSE
TEMPERATURE
OF THE
COMPRESSOR
REMARKS
STATE OF
THE SET
STATE OF THE
EVAPORATOR
LEAKAGE
CLOGGED
B
Y
D
UST
DEFECTIVE
COMPRESSION
- 19 -
NO.
ITEMS
CONTENTS AND SPECIFICATIONS
REMARKS
WELDING
(1) H 30
ROD
(1)
• Chemical Ingredients
• Recommend H34 containing 34% Ag in the
(1) •
Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20%
•
Service Center.
(1)
• Brazing Temperature: 710~840°C
(2) Bcup-2
(1)
• Chemical Ingredients
(1) •
Cu: About 93%
(1) •
P: 6.8~7.5%
(1) •
The rest: within 0.2%
(1)
• Brazing Temperature: 735~840°C
FLUX
(1)
• Ingredients and how to make
• Make amount for only day.
(1)
(1) ••
Borax 30%
•
Holding period: 1 day
(1) ••
Borax 35%
• Close the cover of container to prevent dust
(1) •
Fluoridation kalium: 35%
•
putting in the FLUX.
(1) •
Water: 4%
• Keep it in a stainless steel container.
(1) •
Mix the above ingredients and boil until
(1) •
they are transformed into liquid.
LOKRING
(1) Both of the tube is inserted up to the stop.
• For a hermetically sealed metal/metal
(Figure 23,24)
(2) Both of the LOKRING is pushed up to the stop
connection, the tube ends have to be clean.
(3) The bending point is not too close to the
• LOKPREP is distributed all of out-surface of
joint ending.
•
the tube ends.
(4) During the assembly it is important that
both ends remain completely within the
joint.
joint.
DRIER
(1) Assemble the drier within 30min.
• Don't keep the drier in a outdoors because
ASM
(1)
after unpacking.
•
humidity damages to it.
(2) Keep the unpacked drier at the temperature
of 80~100°C.
VACUUM
(1) When measuring with pirant Vacuum
• Apply M/C Vacuum Gauge without fail.
(1 )
gauge the charging M/C, vacuum
• Perform vacuum operation until a proper
(1 )
degree is within 1 Torr.
•
vacuum degree is built up.
(2) If the vacuum degree of the cycle inside is
• If a proper vacuum degree isn't built up,
•
(2)
10 Torr. below for low pressure and 20 Torr.
•
check the leakage from
(2)
for high pressure, it says no vacuum
•
the Cycle Pipe line part and
(2)
leakage state.
•
Quick Coupler Connecting part.
(3) Vacuum degree of vacuum pump must be
(3)
0.05 Torr. below after 5 min.
(4) Vacuum degree must be same to the
value described item (2) above for more than
20 min.
20 min.
(1) The pressure of dry air must be more
han 12~16kg/cm
2
(2) Temperature must be more than
-20~-70°C.
(3) Keep the pressure at 12~6kg/cm
2
also
when substituting dry air for Nitrogen Gas.
NIPPLE
(1) Check if gas leaks with soapy water.
• Check if gas leaks from joint of the
AND
(2) Replace Quick Coupler in case of leakage.
•
Coupler.
COUPLER
PIPE
(1)
• Put all Joint Pipes in a clean box and
(1)•
cover tightly with the lid so that dust or
(1)•
humidity is not inserted.
1
2
3
4
5
6
7
8
DRY AND
AIR
NITROGEN
GAS
AIR
NITROGEN
GAS
▼ General Control of Refrigerating Cycle
- 20 -
ASSEMBLY JAWS
BOLT
TOOL
TUBE
LOKRING
LOKRING
JOINT
Figure 23. LOKRING
Figure 24. LOKRING TOOL
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