Samsung RSG5K series - 4-2-2) When Power Is Not Supplied (Inverter PCB)

68
TThheerree iiss OOvveerr AACC
222200VV aanndd DDCC 331100VV aatt tthhee
IInnvveerrtteerr PPCCBB PPoowweerr CCiirrccuuiitt..
SSoo,, bbee ccaauuttiioouuss wwhheenn
rreeppaaiirriinngg tthhee uunniitt oorr
mmeeaassuurriinngg vvaalluueess..
- Check MAIN PCB wire
- Check Panel PBA connection
at the upper Hinge Cabi-
Door
- Check the Door panel PCB
connections
- To check the Inverter PCB, refer to
the Operation and 'Refer' sections in
this manual
Start
Normal
Check the wire connection
and connector
NO
Replace Fuse AC 250V
5.0A
YES
Replace the Inverter PCB
NO
Replace the Inverter PCB
NO
Replace REG1(7815)
NO
Replace REG2(5V LDO)
NO
Replace REG3(5V LDO)
NO
1) Check the wire harness
2) Replace PANEL PCB
NO
Replace the Inverter PCB
NO
YES
NO
YES
YES
YES
YES
YES
YES
YES
TROUBLE SHOOTING
4-2-2) When power is not supplied (Inverter PCB)
CCaauuttiioonn
The voltage between
CN102 #1&#3 is about
AC 220V
Is the fuse on the
Inverter PCB blown.?
Is DC 300V
applied between both
ends of BD1+,-?
IS DC 13.2V applied
to C121?
IS DC 15V applied to
C108?
IS DC 5V applied to
C111?
IS DC 5V applied to
C118?
Does PANEL PCB work
normal?
Is there any
PCB soldering short
or breakage?
All manuals and user guides at all-guides.com