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SECTION 34 - DIAGNOSTICS AND TROUBLESHOOTING
FIGURE 112 - DISPLAY TEST MAIN SCREEN
Each display diagnostic is accessed from this screen.
After each diagnostic is performed, return to this
screen, from which the next diagnostic can be selected.
See the description of Display operation in SECTION 7
- LIQUID CRYSTAL DISPLAY, SECTION 8 - DISPLAY
INTERFACE BOARD, and SECTION 9 - DISPLAY
BACKLIGHT INVERTER BOARD of this manual.
PROCEDURE
1. Press the appropriate keypad key to perform the
desired test from the list below.
2. Press the CANCEL (X) or ENTER () key to ter-
minate test and return to DISPLAY TEST MAIN
Screen, from which another test can be selected.
3. When all the desired tests have been performed,
press the DIAGNOSTICS key to return to the
MAIN DIAGNOSTICS Screen.
• Bit Patterns - This test is used to detect jitter and
alignment defects. It verifies proper operation and
compatibility of the microboard Display Control-
ler with the display. Four vertical bars of green,
dark blue, light blue and yellow, outlined by a red
314
DISPLAY TEST MAIN SCREEN
JCI COMPANY CONFIDENTIAL
border are displayed. If the vertical bars are not
stable or straight, or the red border is not com-
pletely visible, then either the microboard Pro-
gram Jumpers are not configured correctly for the
installed display or the microboard Display Con-
troller is defective. See Figure 91 on page 236.
• All Red - This test verifies the operation of all of
the red pixels. All of the red pixels are turned on
to create a completely red screen. Any red pixels
that do not turn on will appear as black dots on the
display. If any black dots appear, first ascertain it
is not caused by dirt that is lodged between the
display surface and the protective plastic cover. It
is normal for a small number of randomly spaced
pixels to not illuminate. It is not necessary to re-
place the display if a small number of black dots
appear. They will not be visible on the normal
screens displayed outside of this diagnostic mode.
However, large black areas would be indicative of
a defective display.
• All Green - This test verifies the operation of all
of the green pixels. All of the green pixels are
turned on to create a completely green screen. See
the description of the All Red test above.
FORM 160.54-M1
ISSUE DATE: 10/25/2019
00337VIP
JOHNSON CONTROLS
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