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

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BrightSign HD2000

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 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?

Yes

No serial

port output

Is there 2.5V DC at

TP19?

Check U32, D24, L83

Yes

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