28
. FIXING ERRORS
1. BOOTING ERROR
(1) No response of Display Boot signal.
Start
Eliminate the problems.
No Display Boot signal.
Power on?
Modify Power status
Is Reset IC working?
Oscillating 27Mhz
clock?
Flash Cs output status?
BUS Interface port Check
Short/open satus.(Resistor,
Flash ROM, SDRAM, Buffer)
Check all BUS and control signal.
Check MEMCLK
(SDRAM PIN38-121MHz)
Check Reset Circuit.
Check 27Mhz VCXO and
other peripheral circuit.
Check CPU power.
(STi5518 Pin27- High)
Check ROM Booting Mode.
Check Wait Signal.
( STi5518 Pin131 - Low)
Flash ROM Check
-Power Ok?
Programmed?
Replacing Flash ROM
Replacing STI5518.
Persecute Short or Open
-Eliminate problems related with power.
-Programming
Yes
No
No
No
No
No
Yes
Yes
Yes
Yes
A
Replacing Sti5518
No
Yes
Yes
Yes
Yes
NO
No
Summary of Contents for DSD-9251MA
Page 17: ...16 CIRCUIT OPERATING MANUAL Feature 9 EMI Interface Timing...
Page 40: ...39 39 SCHEMATIC DIAGRAM...
Page 41: ...40 40 SCHEMATIC DIAGRAM...
Page 42: ...41 41 SCHEMATIC DIAGRAM...
Page 43: ...42 42 SCHEMATIC DIAGRAM...
Page 44: ...43 43 SCHEMATIC DIAGRAM...
Page 45: ...44 44 SCHEMATIC DIAGRAM...
Page 46: ...45 45 SCHEMATIC DIAGRAM...
Page 47: ...46 46 SCHEMATIC DIAGRAM...
Page 48: ...47 47 SCHEMATIC DIAGRAM...
Page 49: ...48 48 SCHEMATIC DIAGRAM...
Page 50: ...49 49 SCHEMATIC DIAGRAM...
Page 51: ...50 ELECTRICAL PARTS LIST 50...
Page 52: ...51 51 EXPLODED VIEW...
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