28
FIXING ERRORS
(1) No response of Display Boot signal.
1. BOOTING LED ERROR
Start
No Display LED signal.
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
A
Power on?
Is Reset IC working?
Modify Power status.
Check Reset Circuit.
Check 27Mhz Crystal and
other peripheral circuit.
Oscillating 27Mhz clock?
Flash Cs output status?
Check CPU power.
(STi5518 Pin27-High)
Check ROM Booting Mode.
Check Wait Signal.
(STi5518 Pin131-Low)
Eliminate the problems.
Replacing STI5518.
BUS Interface port Check short/open
satus.(Resistor, Flash ROM, SDRAM,
Bufffer)
Check all BUS and control signal.
Check MEMCLK
(SDRAM PIN38-121MHz)
Persecute Short or Open
Flash ROM Check-Power OK?
Programmed?
Eliminate problems related with power.
Programming
Replacing Flash ROM
Replacing Sti5518
Summary of Contents for DSD-9255E
Page 17: ...16 CIRCUIT OPERATION MANUAL EMI Interface Timing...
Page 40: ...39 SCHEMATIC DIAGRAM...
Page 41: ...40 SCHEMATIC DIAGRAM...
Page 42: ...41 SCHEMATIC DIAGRAM...
Page 43: ...42 SCHEMATIC DIAGRAM...
Page 44: ...43 SCHEMATIC DIAGRAM...
Page 45: ...44 SCHEMATIC DIAGRAM...
Page 46: ...45 PARTS PLACEMENT ARRANGEMENT...
Page 47: ...46 PARTS PLACEMENT ARRANGEMENT...
Page 48: ...47 PARTS PLACEMENT ARRANGEMENT DSD 9255 FRONT DSD 9256 FRONT...
Page 49: ...48 PARTS PLACEMENT ARRANGEMENT...
Page 50: ...686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA DAEWOO ELECTRONICS Corp...
