Samsung RS757LHQESR/ Series Service Manual page 60

DISASSEMBLY AND REASSEMBLY
9) When the Freezer / Fridge Lamp does not light up
CAUTION
1. When replacing the Freezer Lamp, be sure to turn off the power to prevent electric shock.
2. LED lamps are used in the both of the Fridge and the Freezer compartments of this model.
Remove the Door S/W. And, when measuring its
resistance at its both terminals while opening and
closing the Door, the value should change
between 0Ω and ∞Ω.
1) 0Ω: Door S/W is short.
2) ∞Ω: Door S/W is open.
* Measure at PCB CASE
1. Freezer : CN7 ⑥-⑬ (0V)
2. Fridge : CN7 ⑦-⑬ (0V)
* Measure at PCB CASE
1. Freezer : CN6 #9-#10 (12V)
2. Fridge : CN3 #6-#7 (12V)
▶ Output Voltage of SMPS Connector of Room Lamp
-. Freezer ⑤-⑥, Fridge ⑦-⑧ 12V
-. Measure after opening the related Door.
SMPS Box for
Room Lamp
START
The Door Switch operatesnormally?
YES
When openi n g the Door, the
detecti n g vol t age of the Door
Swi t ch changes?
YES
Open the Freezer or the Fridge Door.
YES
The i n put vol t age of the SMPS
Connector of the Room Lamp i s
115V?
YES
The output voltage of the
SMPS Connector of the Room
Lamp is 13V?
YES
Check Wire
The vol t age measure at the
both connector termi n al s of LED
ROOM LAMP PCB?
Replace LED ROOM LAMP PCB
* Voltage Values by Door Status
Location
Freezer
(PCB Case)
CN6 #9-#10
OPEN 0V
CLOSE 5V
59
NO
Check Door S/W, Check
Wiring Breakage at its
connection (Refer to the
Wiring Diagram)
NO
Check Wire
NO
Check Wire
NO
Replace SMPS
NO
Check Wire
YES
Fridge
CN3 #6-#7
0V
5V