Doesn’t boot, blue LED is ON
N
O
T
O
K
O
K
NOT OK
The board is unrepairable
NO 1.8V
Problem still appears
Check 66.666MHz clock on Y1
pin#3
Check 1.8V output, for
example on C451
Check CPU core voltage 1.0V
output, for example on C435 pins
N
O
T
O
K
NOT OK
O
K
Check DC-DC step down
converter U27
Change faulty U27
Check Q12, Q13, U26
Change faulty Q12, Q13,
U26
Change faulty oscillator
Y1
Check ferrite bead FB8. It
resistance should be less
than 1Ohm.
Change faulty ferrite
bead FB8
N
O
T
O
K
OK
Check LDO U25
Change faulty U25
NOT OK
O
K
Summary of Contents for RB800r2v5
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