C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Jan 30, 2009 | 03:34 PM
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Default led display

My led display is going dead. Works fine for a while then goes blank.It comes back but I think it is hosed.1985 coupe. Need new one or can I repair??
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Old Jan 30, 2009 | 04:30 PM
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It sounds like you have a connection problem or a ground problem or both. There is a known ground problem not making good contact that runs behind the driver side kick panel near the door. Someone else will chime in with more info.

Mike

Last edited by captmike13; Jan 30, 2009 at 09:10 PM. Reason: Correct spelling.
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Old Jan 30, 2009 | 06:47 PM
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doesn t do it at bumps in the road.....random
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Old Jan 30, 2009 | 06:50 PM
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Do your turn signals work all the time or does your Hi-beam indicator come on even when the headlights are off? Each of these are an indication of a bad ground.
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Old Jan 30, 2009 | 10:40 PM
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LED, light emitting diode. The only LED's in an 85 Corvette is the temperature readout in the climate control.
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Old Jan 31, 2009 | 12:16 PM
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Originally Posted by jfb
LED, light emitting diode. The only LED's in an 85 Corvette is the temperature readout in the climate control.
You won't even find them there on an '85.
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Old Jan 31, 2009 | 07:53 PM
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Here's an 85 dash.

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Old Feb 1, 2009 | 12:34 AM
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Originally Posted by Ray Quayle
You won't even find them there on an '85.

The 7 bar readout on the climate control uses led's!
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Old Feb 1, 2009 | 01:29 AM
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www.batee.com under projects/automotive repair/corvette electronics.

everything you need to know about repairing your digi dash.
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Old Feb 1, 2009 | 10:33 AM
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Originally Posted by jfb
The 7 bar readout on the climate control uses led's!
Climate Control wasn't available until '86!
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Old Feb 1, 2009 | 10:57 AM
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Originally Posted by Ray Quayle
Climate Control wasn't available until '86!
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Old Feb 3, 2009 | 07:31 PM
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Ok guys I meant the digi dash. The upper left hand corner is dimmer than the rest of it. When it quits it goes haywire then dark frozen in a haywire state. Then back to normal. The upper left hand corner is still dimmer than the rest of it. No high beam or turn signal problems.
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Old Feb 3, 2009 | 08:41 PM
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Originally Posted by jjgkdg
Ok guys I meant the digi dash. The upper left hand corner is dimmer than the rest of it. When it quits it goes haywire then dark frozen in a haywire state. Then back to normal. The upper left hand corner is still dimmer than the rest of it. No high beam or turn signal problems.
Sounds like you've just got a bad connection at the bulbs or bulb socket. There are 4 bulbs that backlight the LCD panels in digital dash cluster. Remove the heat diffsuser over the problematic bulb and swap the bulb out. If you still have problems you'll have to diassemble the cluster to remove and clean/change the bulb sockets. This task is easier than it sounds.
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Old Feb 3, 2009 | 09:00 PM
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Originally Posted by Ray Quayle
Climate Control wasn't available until '86!
you guys are brutal!!!! LED's LCD's.....just stick with the tried and true...."Nintendo dash" .......no confusion here...

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Old Feb 3, 2009 | 09:16 PM
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Originally Posted by joecarter85
you guys are brutal!!!! LED's LCD's.....just stick with the tried and true...."Nintendo dash" .......no confusion here...

"Atari" dash!
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Old Feb 4, 2009 | 12:58 PM
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Originally Posted by engle1147
Originally Posted by joecarter85
you guys are brutal!!!! LED's LCD's.....just stick with the tried and true...."Nintendo dash" .......no confusion here...

"Atari" dash!
Sorry, to pick nits. My poor sense of humor I'm afraid.

An interesting fact though is that there is a chip on the CPU board that was actually used in early Atari gear. It's called a VIA or Versatile Interface Adapter and is a 40 pin chip at U3 on the CPU board. It is a Delco piece, but was designed for the Atari and was used in many early computers. It conditions Tach and Speedo signals for input to the CPU and processes the Function Select Switches. Did a repair on a cluster where this chip had failed and actually managed to find a place that had them! Bought the ten they had, cause you never know.
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Old Feb 4, 2009 | 01:04 PM
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Originally Posted by jjgkdg
Ok guys I meant the digi dash. The upper left hand corner is dimmer than the rest of it. When it quits it goes haywire then dark frozen in a haywire state. Then back to normal. The upper left hand corner is still dimmer than the rest of it. No high beam or turn signal problems.
Sorry, just havin' a little fun. The dim corner sounds like one of the halogens as engle1147 mentioned. The "frozen in a haywire state" sounds like it could be power supply.
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