4-2-6) When There Is No Power (Inverter Pba) A - Samsung RB31FEJNB Series Service Manual

4. TROUBLESHOOTING
4-2-7) When there is No Power (INVERTER PBA) A+++
Caution
There is AC230V
or DC310V at the INVERTER
PBA Power Circuit. So, be
cautions When repairing the
unit or measuring values.
INVERTER PBA
Check
☞SMPS Secondary Volt
checking(+12V) : REG1:At both Terminals
DC12V±0.8V
☞SMPS Secondary Volt
checking(+5V) : REG1:At both Terminals
DC5V±0.4V
☞SMPS Secondary Volt
checking(+15V) : ZD501:At both Terminals
DC15V±1.5V
- Check the connection of Door
Panel PBA
Start
The unit is plugged In?
Yes
230V is applied at
INVERTER PBA CN102
terminals?
Yes
INVERTER PBA Fuse is blown?
No
DC320V is applied at
BD1 +/- terminals?
Yes
12V is applied at C106 terminals?
Yes
5V is applied at C108 terminals?
Yes
15V is applied at ZD501 terminals?
Yes
Panel PBA operates normally?
Yes
Is there PBA Short or breakage?
No
Normal (Check again)
70
- When Checking the
INVERTER PBA refer to the
Operation descriptions and
"Reference" Section
No
Plug in the unit
No
Check the wire connections
Yes
1) Replace Fuse(AC250V 5.0A)
2) Replace INVERTER PBA ASS'Y
No
Replace PBA ASS'Y
No
Replace PBA ASS'Y
No
Replace PBA ASS'Y
No
1) Check the REG2
2) Replace PBA ASS'Y
No
1) Check the wire Connections
2) Replace PBA ASS'Y
No
1) Do Re-soldering
2) Replace PBA ASS'Y