3.12 Failure to read T-flash card
First, change another T flash card, check whether T flash card bad or not
Second, check card connector solder ok or not, if fail, re-solder or change a new one
Third, check TVS reserved or not, check VDD whether normal
Fourth, test related signals, such as
MCCK, MCCM0, MCDA0, MCDA1…MCDA3, if
abnormal, check U200, re-hot or change a new one.
T-F Card is not
identified
Change a new
TF-card to test
T-F card is
damaged. Replace
it
Check T
flash card
socket ok or
Check TVS
reverse or not?
Re-solder it or
change new one
Solder it correct
Check VDD
OK or not?
Hot U1420 or
change new
one
Y
N
N
N
Y
Y
N
Check each
signal OK or
not?
Hot U200
or change
new one
N
N
