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FIXING ERRORS
1. BOOTING LED ERROR
(1) No response of Display Boot signal.
YES
No Display LED signal.
YES
YES
Is Reset IC working?
YES
Oscillating 27Mhz clock?
YES
A
Flash Cs output status?
YES
BUS Interface port Check short/open
satus.(Resistor, Flash ROM, SDRAM,
Bufffer)
Check all BUS and control signal.
Check MEMCLK
(SDRAM PIN38-121MHz)
YES
Flash ROM Check-Power OK?
Programmed?
YES
Replacing Flash ROM
Start
NO
Power on?
NO
NO
NO
NO
NO
NO
Modify Power status.
Check Reset Circuit.
Check 27Mhz Crystal and
other peripheral circuit.
Check CPU power.
(STi5518 Pin27-High)
Check ROM Booting Mode.
Check Wait Signal.
(STi5518 Pin131-Low)
YES
Replacing STI5518.
Persecute Short or Open
Eliminate problems related with power.
Programming
Replacing Sti5518
28
NO
Eliminate the problems.
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