Lcd Backlight Does Not Come On - Brother PE770 Service Manual

Failure Investigation for Electronic Parts LCD backlight does not come on

LCD backlight does not come on.

Is the lead wire of the LCD assy. and the
main PCB assy. properly connected?
Is the lead wire assy. (power) free from
breakage and connected correctly between
the main PCB and the motor PCB?
Is the voltage between pins 2 & 1 on
the main PCB assy connector (CN8)
approximately 6 - 7 V?
Replace the main PCB assy.
Y
Y
Y
N
Reconnect it correctly.
Connect the lead wire assy.
N
(power) correctly or replace it.
N
Replace the LCD assy.
5 - 7