Blank Display - Norcold Polar N7V Service Manual

TROUBLESHOOTING FLOWCHARTS - N7X AND N8X MODELS, cont'd.

Blank Display

Before starting this procedure verify:
■ DC voltage to the refrigerator is 10.5 to 16.0 volts.
■ No other appliance or lighting circuit is connected to the refrig-
erator DC circuit.
■ DC input of the vehicle is wired into the main control board ac-
cording to the Refrigerator Installation Manual.
Touch Power ON button
to turn refrigerator on.
YES
Refrigerator
turns ON?
NO
Measure DC input voltage to main
control board (power board)
at terminals 12VDC and GND.
Check continuity of F1 fuse
located on main control board
(power board).
Measure voltage at main control
board (power board) between
P1-9 (white/violet) and P1-12 (green)
Measure voltage at user interface
(controls) wire harness between P1-1
(green) and P1-5 (white/violet).
NOR000803A
Replace user interface assembly.
Polar Series N7V, N7X, N7XL / N8V, N8X, N8XL
No problem.
NO
10.5 to
16.0 VDC?
YES
NO
Is fuse intact
(zero ohms)?
YES
NO
10.5 to
16.0 VDC?
YES
NO
10.5 to
16.0 VDC?
YES
NORCOLD
Correct DC input
to refrigerator.
Replace fuse
(5-Amp MINI Blade
Automotive style)
Replace main
control board
(power board).
Check connection/continuity of
green wire between main control
board (power board) (P1-12) and
user interface (controls (P1-1).
Check connection/continuity of
white/violet wire between main
control board (power board) (P1-9)
and user interface (controls (P1-5).
Call Customer Service.
36
A
MODE
Blank display.
Possible Cause:
The refrigerator is OFF.
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