Samsung SG626, SG628, BG626, BG678, SG676 Troubleshooting

7. Troubleshooting

Precautions

1.Is the power cord well connected to wall outlet?

2.Refer to the reference

1)No power

	Start
			N
	DC-Trans primary
	power input?
		Y		Check wires
			N
	DC-Trans secondary
	power input?
		Y		Replace DC-Trans
			N
	Main PCB fuse
	brown out?
		N		Replace fuse
			N
	Power input to IC02?
Measure C03
		Y		Check BD05 – 08
(1000M/35V)
			N
	DC 12V output
Measure IC02	from IC02?
		Y		Check IC02(MC7812)
OUT voltage
			N
	DC 5V output
	from IC03?
Measure IC03		N		Check IC03(KA7805)
OUT voltage
			N
	Are wires connected to
	panel securely?
		Y		Check wire connection			Reference 1
			Y				(Page. 38)
	Panel PCB Ass’y
	is OK?
		Y		Replace panel PCB
	OK

28	Samsung Electronics

2) Compressor does not run

Precautions

1.Compressor does not operate in 5 minutes after power ON and compressor OFF.

2.Compressor does not run during defrosting.

3.Compressor does not run because low temperature is detected if freezer sensor is not connected.

Reference 6

(Page. 40)

N

Replace MICOM

and PCB

N

Replace IC07

N

Replace relay

Start
					N
5 minutes after
compressor off?
		Y
							Check it after 5 minutes
Is compressor					Y
operated by forse?
	N						Freezer sensor is
		Reference 7
							OK?
MICOM pin24			(Page. 41)
								Y
output is “HIGH”?
							Main PCB temperature
	Y
IC07 pin10 output							detector is OK?
								Y
is “LOW”?
							Check wiring
	Y
Comp relay is OK?
								Reference 2
	Y							(Page. 38)
					N
Connector CON 8, 10
contects are OK?
	Y						Check connector
Comp ass’y is OK?					N
	Y						Replace comp

Check wires connection

N

Replace sensor

N

Check detector & replace PCB

Samsung Electronics

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3) No defrosting

Precautions

1.Even though both F·R-defrost sensors short-circuit, normal operation continues without defrosting.(Refer to self-diagnosis function)

2.Even though the temperature fuse is off, there is no heating but defrosting natural temperature increase comp off-time takes longer.

3.Even though both F·R-defrost sensor are open, heating does not end and comp-off maintains with temperature fuse short-circuited.(Refer to self-diagnosis function)

Y

A

R Defrost H #14

F Defrost H #15

R Defrost H #18

F Defrost H #19

R Defrost H RY01

F Defrost H RY09

Start
Does defrosting	N
start if the forced defrost
key is pressed?
	N	Does the defrost-sensor
Y		register –5˚C?
	Reference7
Is power supplied to	(Page. 41)	Y
	Measure resistance
defrost heater?	of defrost sensor	Forced starting
N
Are MICOM pin 14, 15	N
“HIGH”?

		Y		Replace MICOM & PCB
			N
	Are IC 06 pin 17, 18

“LOW”? Replace IC06

Y

Defrost heater			N
relay is OK?
				Replace relay
Reference 2		Y
(Page. 38)

Connector CON C8, 09, 10

are OK?

Y

Evaparator temp. fuse short-circuited?

Y

Defrost P-cord shortcircuited?

N

Replace CON

N

Replace temperature fuse

N

Replace EVAP ass’y

Check wire connection

30	Samsung Electronics