LG Gr P227 Ytqa Service Manual

3. Ice Maker Troubleshooting
* 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)

ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR
- 71 -
No
Yes
Yes
Yes
No
No No
No
Yes
YesIs DC Power (5V and 12V) 
output normal?Failed DC Power
• Check DC power (5V, 12V).Change main PWB
Is cube ice led off during...

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ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR
No
Yes
Yes
Yes
No
No No
No
Yes
YesIs 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 ice making sensor
• Check the resistance of 
both ends (1,2) of ice making 
sensor of CON8. 
• Defects between ice making 
sensor and board 
(Pin No.  59 of IC1)Replace Ice making
Sensor
Is Crushed Ice LED off during
troubleshooting check?Failed Ice Maker...

CIRCUIT
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CIRCUIT
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1. TROUBLE SHOOTING
TROUBLE DIAGNOSIS
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CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK
1. Faulty start
1) No power on outlet.
2) No power on cord.
3) Shorted  start circuit.
4) During defrost.* Measuring instrument :
Multi tester
Check the  voltage.
If the voltage is within ±85%
of the rated voltage, it  is OK.
 Check the terminal
movement.
 
Check both terminals of
power cord.
Power conducts : OK.
No power conducts : NG
 Check both terminals of
O.L.P.
If power conducts : OK.
If not : NG.
 Check...

TROUBLE DIAGNOSIS
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CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK
2. No cooling.
2) Refrigeration system is clogged.Check the clogged
evaporator by heating (as
soon as the cracking sound
begins, the evaporator start
freezing)
 The evaporator does not cool
from the beginnig (no evidece
of misture  attached).
The evaporator is the same
as before even heat is
applied.
Moisture
clogged.
No electric
power on
therm-
ostat.
Weld joint
clogged.
Drier cloggeing.
Foreign material clogging.Residual moisture...

TROUBLE DIAGNOSIS
- 77 -
CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK
3. Refrigeration 
is weak.
Heater 
Sheath
1) Refrigerant Partly leaked.
2) Poor defrosting capacity.
Drain path (pipe) clogged.
Defrost heater does not 
generate heat.
Weld joint leak.
Parts leak.
Inject P/U into drain hose.
Foreign materials
penetration.
Cap drain is not disconnected.Inject through the
hole.
Seal with drain.
P/U lump input.
Screw input.
Other foreign materials
input.
Parts 
disconnected.Wire is cut.
- Lead wire.
-...

- 78 -
TROUBLE DIAGNOSIS
CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK
3. Refrigeration 
is weak.
3) Cooling air leak.
4) No cooling air circulation.
Residual
frost.
No automatic defrosting.
Defrost does not return.
Bad gasket adhestion
Door sag.
Faulty fan motor.Weak heat from heater.
Too short defrosting time. Defrost Sensor.
- Faulty characteristics.
Seat-D(missing, location. thickness).
Structural fault. Gasket gap.
Air inflow through the fan motor.
Bad insulation of case door.Sheath Heater - rated....

TROUBLE DIAGNOSIS
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CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK
3. Refrigeration 
is weak.
4) No cooling air circulation.
5) Compressor capacity.
6) Refrigerant 
too much or too little.
7) Continuous operation
-  No contact of temperature controller. - Foreign materials.
8) Damper opens continuously.
Foreign materials 
jammed.
Failed sensor.  -  Position of sensor.
Characteristics 
of damper.
9) Food storing place. - Near the outlet of cooling air.
Faulty fan motor.
Small cooling air
discharge.Fan...

TROUBLE DIAGNOSIS
- 80 -
CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK
4. Warm
refrigerator
compartment
temperature.
5. No automatic
operation.
(faulty 
contacts.)
6. Dew and 
ice formation.
1) Colgged cooling path.
2) Food storate.
1) Faulty temperature sensor in freezer or refrigerator compartment.
2) Refrigeration load is too much.
3) Poor insulation.
4) Bad radiation.
5) Refrigerant leak.
6) Inadequate of refrigerant.
7) Weak compressor discharging power.
8) Fan does not work.
9) Button is positioned...