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-9251MAV
Page 8: ...7 CIRCUIT OPERATION MANUAL 1 Block Diagram DSD 9251EAV Block Diagram ...
Page 17: ...16 CIRCUIT OPERATION MANUAL EMI Interface Timing ...
Page 41: ...40 SCHEMATIC DIAGRAM ...
Page 42: ...41 SCHEMATIC DIAGRAM ...
Page 43: ...42 SCHEMATIC DIAGRAM ...
Page 44: ...43 SCHEMATIC DIAGRAM ...
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Page 51: ...50 SCHEMATIC DIAGRAM ...
Page 52: ...51 SCHEMATIC DIAGRAM ...
Page 53: ...52 SCHEMATIC DIAGRAM ...
Page 54: ...53 PARTS PLACEMENT ARRANGEMENT ...
Page 55: ...54 PARTS PLACEMENT ARRANGEMENT ...
Page 56: ...55 PARTS PLACEMENT ARRANGEMENT 9252 FRONT PCB ...
Page 57: ...56 PARTS PLACEMENT ARRANGEMENT 9251 FRONT PCB ...
Page 58: ...57 PARTS PLACEMENT ARRANGEMENT ...
Page 59: ...686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA DAEWOO ELECTRONICS Corp ...
