When Power Is Not Applied - Samsung RF28R7201 AA Series Service Manual

TROUBLESHOOTING

4-2-6. When Power is not applied

Caution
At the power of SMPS PCB, the AC115(230)V power and a
high-voltage over DC 170(325)V are occurred.
Please take care of yourself on repair and measurement.
Check the MAIN PBA
- 12V : both ends of C1006
- 5V : CN90 #2 ↔ #28
Start
Is the power plug connected?
Yes
Does
the SMPS deliver normal output
voltages of 12V
and 5V?
Yes
Does the Panel PCB
function properly?
Yes
Is there any
soldering short or poor soldering job
detected on PCB?
Yes
Normal
86
No
Make sure the plug is
connected and not loose.
No
Replace the PCB ASSY
No
- Checking connection of main PCB.
- Checking connection between
upper hinge and door.
- Checking connection of door panel PCB.
No
1. Resolder the PCB.
2. Replace the PCB MAIN.