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4. Troubleshooting
4-1 Checkpoints by Error Mode
4-1-1 No Power
No Power
Check MAIN PCB IC21
Pin 14, 40, 55, 89: 5V?
Yes
1
Check MAIN PCB
IC21 Pin 1: 5V (High)
Yes
Check MAIN PCB
C525 (VFD+), C530 (VFD-),
C531 (-VP)
Yes
2
Check IC21 Pin 8
(Micom Reset), X-TAL2,
X-TAL3
Yes
Replace MICOM IC
Samsung Electronics
No
No
Refer to wave pattern
image of Fig. 4-1.
No
No
Refer to wave pattern
image of Fig. 4-2.
Check MAIN PCB
IC1P104 Pin 1: 5.6V,
Pin 5: 0.7V, Pin: 1V?
Yes
Check MAIN PCB
T1 Pin 12: HIGH
Check MAIN PCB
PT01 Pin 10, 11, 12
Check or replace signal line,
X-TAL
Troubleshooting
No
1. Check pattern or replace
IC1P104.
2. Check SMPS part (high
voltage, danger).
No
1. Check pattern or replace
UF4007.
2. Check SMPS part (high
voltage, danger).
No
1. Check 1SQ22 (about ECO
mode) work status
2. Check pattern or replace
them
3. Check SMPS part (high
voltage, danger).
4-1
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