Alto-Shaam 750-SK

TROUBLESHOOTING
De lux e Control Cook & Hold ▪ Service Manu al ▪ MN -46 712 ▪ Rev 01 ▪ 11 /20
47
The Display does not Illuminate
WARNING: Electric shock and arc flash hazard.
Use caution when measuring line voltage.
Wear Personal Protective Equipment (PPE).
Do you have 12VDC to the interface board?
No
See steps below.
Yes
Do you have 1 LED illuminated on the interface
board?
No
Replace the interface board.
Yes
Press the power button. Does the second LED
illuminate on the interface board?
No
Inspect the wired connection to on/off board.
If the button continues not to light up,
replace the on/off board.
Yes
Do you have DC voltage out of the backlight
connector on the interface board?
No
Press and hold the power button until only 1
LED is illuminated on the interface board.
Then press and release the power button so
that the second LED comes back on. Recheck
the backlight voltage. If no voltage, replace
the interface board.
Yes
Disconnect the I2C cable from the interface board
to the LCD display, inspect and re-install the
connector. Do you get a display now?
No
Screen working again.
Yes
Replace the backlight cable. Do you get a display
now?
No
Screen working again.
Yes
Replace the I2C cable. Do you get a display now?
No
Screen working again.
Yes
Replace the interface board.
No
Screen working again.
Yes
Replace the display.
No
Should be working now.
Yes