Samsung RL38H Series, Service Manual

Page: 74 / 206

74
5. SELF DIAGNOSIS & TROUBLE SHOOTING TROUBLESHOOTING
4-2-4 When the refrigerator does not turn on
Start
Check the connector
Normal
NO
YES
Is the input voltage
at the primary of DC - TRANS?
(Power Voltage)
Replace DC-TRANS
NO
YES
Is the voltage output
at the secondary part of the transformer?
(MAIN PCB CN10
➀
-
➂
: 16V/AC,
➄
-
➆
: 14V/AC)
Check MAIN PCB. REG1(7812),
Replace PCB
NO
YES
Check MAIN PCB.
REG2(7805), Replace PCB
NO
YES
Is the 5V terminal normal?
(Voltage at MAIN PCB
C106)
Check MAIN PCB. REG2(7805),
Replace PCB
NO
YES
Is the voltage at the motor
terminals normal? (Voltage at MAIN PCB
GND-Q1O1 HEAT
SINK: 13V/DC)
1) Check the connector
2) Replace PANEL PCB
NO
YES
Does the PANEL PCB
operate normal?
1) Replace the relevant relay
2) Check LEAD WIRE
contact
NO
YES
Do the components such as
the relays work properly?
Replace MAIN PCB
NO
YES
Is there any defective
soldering on PCB?
Is the 12V terminal normal?
(Voltage at MAIN PCB C103)
☞
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.
- Check MAIN PCB Connector
- Check the connection at the Upper Hinge Cabi-Door
- Check the Door Panel PCB connections