2) power led comes on, no serial port output, Ower, Comes on – BrightSign HD2000 Hardware Guide User Manual
Page 16: No serial port output, Brightsign hd2000
BrightSign HD2000
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(2) Power LED comes on, no serial port output
Check U17,
U18
Check U1,
Y2, C82, C84,
R63
Check U33, L84, D25
Is there 1.2V DC
at TP20?
Is there 27MHz at
TP5?
Is RESET_L high at
pin 11 of U18 after
powerup?
No
No
No
Yes
Yes
No serial
port output
Is there 2.5V DC at
TP19?
Check U32, D24, L83
No
Yes
No
Check U13
Check I2C bus for
shorts, Check
PNX8950 U1
Is SYS_RESET_L
high at C83 after
powerup?
Check U13
for good
program and
good solder
joints,
Yes