When The Refrigerator Does Not Turn On - Samsung RL44Q Series Service Manual

5. SELF DIAGNOSIS & TROUBLE SHOOTING TROUBLESHOOTING

4-2-4 When the refrigerator does not turn on

☞ How to measure
1) Measure the input voltage of the primary
Trans
2) Measure the output voltage of the
secondary Trans (A)
3) Measure the output voltage of the
secondary Trans (B)
4) Measure the voltage at the 12V
terminal (C103) and. And, by using
the Common PCB Ground, measure
the voltage at the 5V terminal (C106)
5) Measure the Motor input voltage
(Q101-GND)
6) Common PCB Ground
<Note>
There is AC 200~240V flowing at the Main PCB.
So, take care when doing a repair or a easurement
with a tester.
Start
Is the input voltage
at the primary of DC - TRANS?
(Power Voltage)
Is the voltage output
at the secondary part of the transformer?
(MAIN PCB CN10 ➀-➂: 16V/AC,
➄-➆: 14V/AC)
Is the 12V terminal normal?
(Voltage at MAIN PCB C103)
Is the 5V terminal normal?
(Voltage at MAIN PCB
C106)
Is the voltage at the motor
terminals normal? (Voltage at MAIN PCB
GND-Q1O1 HEAT
SINK: 13V/DC)
Does the PANEL PCB
operate normal?
Do the components such as
the relays work properly?
Is there any defective
soldering on PCB?
Normal
- Check MAIN PCB Connector
- Check the connection at the Upper Hinge Cabi-Door
- Check the Door Panel PCB connections
74
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check the connector
Replace DC-TRANS
Check MAIN PCB. REG1(7812),
Replace PCB
Check MAIN PCB.
REG2(7805), Replace PCB
Check MAIN PCB. REG2(7805),
Replace PCB
1) Check the connector
2) Replace PANEL PCB
1) Replace the relevant relay
2) Check LEAD WIRE
contact
Replace MAIN PCB