If Power Is Not Supplied - Samsung RF267AE series Service Manual

TROUBLESHOOTING

4-2-6. If Power is not supplied

Caution
At the power of main PCB, the
AC115V power and a high-voltage
over DC 170V are occurred.Please
take care of yourself during repair
and measurement.
Check in SMPS PBA
☞ Checking method of voltage
CN70 input ; CN70#9(Red) ↔ #11(Gray)
AC voltage
☞ Checking method of DC 2nd output voltage
REG1 input ; Regulator 7805 →same as C107
terminals.
DC 13.0V ± 0.8V
☞ Checking method of DC 2nd output voltage
REG1 output ; Regulator 7805 → same as C109
terminals.
DC 5V ± 0.5V
- Check MAIN PCB connection
- Check the connections between
cabinet and door
- Check the connections between
door and panel PCB
Start
Is the plug connected in?
Is power 115V applied to the
both terminals of SMPS PCB
CN70 #11-#9?
Is fuse on the SMPS
PCB down?
Is DC170V
applied to the both
terminals of BD1+,-
Is DC5.8V
applied between TOP
switch 246Y C and S?
Is 13V applied to the both
terminals of C107?
Is 5V applied to the both
terminals of C109?
Does Panel PCB
operate normally?
Is the load (i.e. Relay)
normal?
Is there any PCB
soldering, short,
breakage?
Normal(Recheck)
72
- Refer to the function and
reference parts in the manual
when check the MAIN PCB
Connect plug again,
check the plug loosening
Check the assembly and wire
connection
1) Replace FUSE AC 250V 2.0A
2) Replace PCB ASS'Y
1) Check PCB PATTERN and repl a ce BD1
2) Repl a ce PCB ASS' Y
Replace PCB ASS' Y
Replace PCB ASS'Y
1) Check REG1 (KA7805)
2) Replace PCB ASS'Y
1) Check assembly wire and repair
2) Replace Panel PCB
1) Check the contact of lead wire
2) Replace the applicable relay / PCB MAIN
1) Solder again
2) Replace PCB MAIN