Cobra 29 LX Series Technical Service Bulletin
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Cobra 29 LX Series Technical Service Bulletin

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6500 W. Cortland Street * Chicago, IL 60707 * Phone: 773-889-8870 * FAX: 773-622-2269
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September 8, 2011
TECHNICAL SERVICE BULLETIN
MODEL(S):
29 LX and variants

DESCRIPTION:

Display troubleshooting

ACTION:

Does the backlight light up?

If the backlight lights up but the display is otherwise blank, then the ribbon cable
for the display may have become dislodged. Please refer to pages 2-3.

Is the display active, but dark?

If the display is dark even when power is turned on, then it may be a problem
with the backlight. Carefully inspect the display while power is turned on. Try
changing the channels. It might be that the display is actually working but the
Backlight is out. If this is the case then the display will be dark but you should
see all the various details (numbers, icons, etc.). If you find this to be true, then
please refer to pages 4-5.
Is the display totally dead?
If the display is totally blank (no backlight, no details) then double-check
whether the radio has experience reverse polarity. If the reverse polarity diode is
blown (D23) then replace the diode and repair any associated damage.
If the problem persists
If you have gone through all the above troubleshooting tips and there is still a
problem, then try replacing the CPU/WX board, Cobra p/n 300-009.
ADJUSTMENTS:
None
NOTES:
None
Consumer Response Group
10076
Page 1 of 5

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Summary of Contents for Cobra 29 LX Series

  • Page 1 (D23) then replace the diode and repair any associated damage. If the problem persists If you have gone through all the above troubleshooting tips and there is still a problem, then try replacing the CPU/WX board, Cobra p/n 300-009. ADJUSTMENTS: None...
  • Page 2 Technical Service Bulletin 10076 Page 2 of 5 Ribbon Cable There is a ribbon cable which runs from the display to the display PCB. If this cable becomes loose then you may loose the display. Or the display may become intermittent. The backlight will still illuminate, but the display will not show any information.
  • Page 3 Technical Service Bulletin 10076 Page 3 of 5...
  • Page 4 Technical Service Bulletin 10076 Page 4 of 5 Backlight If the backlight is out, then the display will appear dark but you will still see all the proper lettering, icons, etc. Here is an example: If this is the case, then measure the backlight voltages as shown on the following page.
  • Page 5 The backlight voltage should read between 5-18VDC depending on the DIM setting. If the voltages are not present then replace the backlight power supply, Cobra p/n 306-004. The backlight power supply is a metal can mounted to the side of the chassis: If the voltage measure correctly but the backlight is still dark, then replace the backlight module, Cobra p/n 306-003.

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