CHECK AND TEST 1
Step 1
Unscrew cover of mainboard with a cross-head screwdriver.
Step 2
In PCB area, check if
terminal is pushed into
final position.
IF NOT, PUSH IT INTO PROPER
FINAL POSITION.
Step 3
In PCB, check to see if terminal is full of foam.
IF SO, USE TWEEZERS TO REMOVE FOAM.
Step 4
In PCB area, use multimeter to measure resistance value.
Step 5
Take note of the test result.
Step 6
Use infrared detector to
measure the temperature
of freezer air duct in area shown in red circle on right, use as reference temperature for defrost temp. sensor.
Step 7
Test temperature of freezer air duct.
Note
Use tested reference temperature to find out standard resistance value in table 1 below.
DIAGNOSIS 1
PROCEDURE 1
Step 1
Remove the freezer drawer.
Step 2
Remove the middle glass shelf located between upper and bottom freezer drawer compartments.
Step 3
Unscrew air duct
a. Check the freezer air duct to find the three screw covers.
b. Remove the screw
covers (total of three)
on the air duct with
slotted screw driver.
c. Unscrew all three
screws with Cross-
head screw driver.
Step 4
Dismantle the air duct.
a. Catch the bottom of air duct.
b. Pull air duct out from below from the bottom of air duct.
c. Pay attention to the connectors when pulling out the air duct.
d. Disconnect the
terminal for fan motor.
e. Disconnect the
terminal of temp.
sensor.
f. Take the air duct out of the freezer compartment.
e. Remove air duct.
CHECK AND TEST 2
Step 1
Use a multimeter to measure the resistance value of defrost temp. sensor from terminal located in freezer.
a. Insert the detectors
into terminal and
make sure connection
is good;
b. Read the value;
Step 2
Measure the temperature of defrost temp. sensor.
DIAGNOSIS 2
PROCEDURE 2
Step 1
Disconnect the terminal.
Step 2
Cut off plastic tie.
Step 3
Take sensor out of the plastic buckle.
REVERSE STEPS ABOVE TO INSTALL DEFROST SENSOR.
CHECK AND TEST 3
Step 1
Check to see if the terminal is full of foam.
IF SO, USE A TWEEZERS TO CRUSH AND REMOVE FOAM.
Step 2
Make sure sensor is properly located by comparing with photo on right.
IF SENSOR IS NOT IN
SAME POSITION AS
PHOTO, FIX IT.
Step 3
Check to see if sensor wires have been cut off; if so, follow procedures below to rework.
DIAGNOSIS 3
PROCEDURE 3
Step 1
Step 2
Peel off the sleeves.
Step 3
Check for proper wire order, then connect them.
Step 4
Tin soldering.
Step 5
Cover point of connection with electrical tape.
CHECK AND TEST 4
Step 1
After confirming the sensor and terminals are OK, or replacing the sensor, reconnect the terminal.
Step 2
Use a multimeter to measure the resistance value of defrost temp. sensor from terminal located in mainboard area.
a. Insert the detectors
into terminal and
make sure connection
is good;
b. Read the value;
Step 3
Measure the temperature of sensor.
NOTE
DIAGNOSIS 4
PROCEDURE 4
Tip 1
When re-installing the air duct, move the wires out of the way so that they won’t be crushed by air duct.
Tip 2
After pushing air duct into position, it should make a click sound. If no click is heard, do it again.
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