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