Alpine CDA 7850 No Display - diyAudio
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Old 4th April 2012, 06:37 AM   #1
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Default Alpine CDA 7850 No Display

Hi My car stereo display failed when I started my Car but it is functioning without any problem.CD ,Radio,front panel Buttons ,Remote everything is working .But no Display.Just want to figure out is the problem in fuse in the Car or with Car Head unit or Unit face plate.Please Suggest some solution.

Advance thanks for your Support.

Sriram
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Old 4th April 2012, 11:18 AM   #2
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Maybe the backlight is out, if everything else is working.
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Old 4th April 2012, 11:23 AM   #3
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Default thanks

Hi brandes thanks for your reply,but I tried each and every LED imside the faceplate with battery and it glows.So I think ther will be no probelm with backlight.
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Old 5th April 2012, 02:17 PM   #4
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same problem happens to Kenwood cd's. Resolder all of the smd resistors grouped together on the main circuit board. Hope this helps.
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Old 6th April 2012, 12:30 AM   #5
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Does this have a fluorescent display?
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Old 6th April 2012, 06:19 AM   #6
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Default NO LIGHT

May Be I need to add this.The Display and also the LED light for the Front panel keys are also not working .
There is no Sign of Light and It is Totally blind .I guess the Voltage going to the LED circuit might be problem but could not figure out the Correct Circuit.
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Old 7th April 2012, 06:51 AM   #7
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If this head unit has a ribbon cable that flexes when the face is folded down, the ribbon could be defective.
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Old 8th April 2012, 05:52 AM   #8
ivkata is offline ivkata  United States
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I vote for the ribbon as well.I fixed quite a few Alpines in the past and those with the tilt face tend to have bad ribbons -mostly the first or the second pin right to left as those are the thicker ones -most likely power/ground .In mine they will break right by the connector and won't be visible till the cable is removed from the unit completely
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Old 9th April 2012, 07:34 AM   #9
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Thanks for your reply.I doubt that if the ribbon cable is the problem then how could the face plate buttons work with tone.May be separate power for Display and buttons.
Also one more thing I observed.When we eject CD source there will be LED Light behind the face plate when it it got tilted to insert or remove CD.Even that is also not glowing So I doubt on the Ribbon cable
Also can you provide the Pin configuration for the ribbon cable so that I check Voltage with multi meter.
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Old 22nd September 2012, 03:41 PM   #10
ttimbo is offline ttimbo  Canada
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Did you resolve this issue? What was the cause/solution?

I am having the same exact problem with an Alpine CDA-7897.

Retractable phantom face looks completely dead, no lighting at all, but with a flashlight I can see the display is showing time counter of cd or radio stations and buttons beep when depressed.

The ribbon cable on mine seems to be in good condition when disassembled during troubleshooting, but it could've been bad. Maybe I should get a replacement ribbon cable.

Anyone know of a good place to get a replacement ribbon cable for an Alpine CDA-7897 and roughly at what cost?

If I get replacement ribbon cable, how would I go about disassembling the face to access that end of the ribbon going into the back of the face?

Any suggestions, help, recommends?

Thanks
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