2) power led comes on, no serial port output, Ower, Comes on – BrightSign HD1010 Hardware User Manual
Page 17: No serial port output, Brightsign compact
BrightSign Compact
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(2) Power LED comes on, no serial port output
Check U15,
U36, S2
Check U3,
Y3, C186, C187,
R134, Nand flash
U25
Check U20, L6, C223
Is there 1.2V DC
at TP20?
Is there 16MHz at
TP7?
Is RESET_L high at
pin 1 of U15 after
powerup?
No
No
No
Yes
Yes
No serial
port output
Is there 2.5V DC at
TP18?
Check U18, L5, C212
No
Yes
No
Check U3
Check nand
contents U25,
check nand bus,
check sdram
Is SYS_RES_OUT_N
high at C188 after
powerup?
Check U25
for good
program and
good solder
joints, check
SDRAM
Yes