Cobra 29 LX Series User Manual (English)

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Consumer Response Group

6500 W. Cortland Street * Chicago, IL 60707 * Phone: 773-889-8870 * FAX: 773-622-2269

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September 8, 2011 Page 1 of 5

TECHNICAL SERVICE BULLETIN

10076

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

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Cobra 29 LX Series Specifications

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