2) power led comes on, no serial port output, Ower, Comes on – BrightSign HD600 Hardware Guide User Manual

Page 16: No serial port output, Brightsign hd600

Text mode
Original mode

BrightSign HD600

This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Roku assumes no
obligation regarding future manufacturing unless otherwise agreed to in writing.

www.rokulabs.com

(2) Power LED comes on, no serial port output

Check U36

Check U26

Check U27, L59, D18

Is there 1.2V DC

at TP42?

Is there 27MHz at

R50?

Is RESET_L high at

R197 after powerup?

Yes

No serial

port output

Is there 2.5V DC at

TP19?

Check U22, D11, L55

Yes

Check U23,

Check I2C bus for
shorts, Check
PNX1500 U18

Is SYS_RESET_L

high at R7 after

powerup?

Check U9 for
good program
and good
solder joints,

Yes