Samsung RF28HMEDBSR Service Manual page 90

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 SMPS PBA
-. 12V : CON02(#1<>#3)
-. 5V : CON02(#5<>#3
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
90
No
Make sure the plug is connected and not
loose.
No
Replace the PCB ASSY
No
4-2-9. Panel PBA Check
No
1. Resolder the PCB
2. Replace the PCB MAIN