4-2-1) When Power Is Not Supplied - Samsung RSG5D SERIES Service Manual

TROUBLE SHOOTING

4-2-1) When power is not supplied

N N o o t t e e S S M M P P S S c c i i r r c c u u i i t t i i n n t t h h e e
M M A A I I N N P P B B A A o o p p e e r r a a t t e e s s a a t t 2 2 3 3 0 0
V V A A C C & & 3 3 0 0 0 0 V V D D C C ( ( o o r r 1 1 1 1 5 5 V V A A C C
a a n n d d 1 1 6 6 0 0 V V D D C C ) ) . . P P l l e e a a s s e e t t a a k k e e
c c a a r r e e o o f f y y o o u u r r s s e e l l f f d d u u r r i i n n g g t t h h e e
r r e e p p a a i i r r a a n n d d m m e e a a s s u u r r e e m m e e n n t t . .
2 2 3 3 0 0 V V A A C C d d e e s s c c r r i i b b e e d d i i n n t t h h i i s s
m m a a n n u u a a l l d d e e p p e e n n d d s s o o n n i i n n p p u u t t
p p o o w w e e r r s s u u p p p p l l y y v v o o l l t t a a g g e e . .
- Check Panel PBA Connector
- Check the connection at the
Upper Hinge Cabi-Door
- Check the Door Panel PCB
connections
Start
NO
The voltage between
NO
CN70 #1 & #3 is about
230 VAC(or 115V).
YES
The fuse on the
YES
MAIN PBA is blown.
NO
The voltage
NO
across BD1 is about 300
VDC(or 160).
YES
The voltage
NO
between C & S pin of TOP246YN is
about 5.8V
YES
NO
The voltage across
C107 is about 13V
YES
The voltage
NO
across C109 is about 5V
YES
NO
Does PANEL PBA
operate normally?
YES
Do the
NO
components such as the relays
work properly?
YES
Is there
NO
short-out soldering on PBA?
YES
Normal
67
- When checking MAIN PBA, refer to
the Operation Description and the
Reference sections in this manual.
Check the wire connection
and connector
Replace Fuse: 250V 2A
Check PBA pattern &
Replace BD1
Replace PBA ASS'Y
Replace PBA ASS'Y
Replace PBA ASS'Y
1) Check the connector
2) Replace PANEL PBA
Replac relevant relays or PBA
ASS'Y
Replace MAIN PBA