1987 LCD DASH display
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Joined: Apr 2010
Posts: 84
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1987 LCD DASH display
Well, the saga continues....it works, it doesn't work, it works, etc..
The car had been setting for about a month. I went to crank it. The display came on. The engine almost cranked. I turned the key off/on to recycle the fuel pump. When I turned the key on to crank it....no display. The engine cranked, but no display. Turned it off. I recranked the engine, still no display. I disconnected the battery, let it sit overnight. Reconnected the battery, turned the key on...display working. Cranked engine, display working. Any explanation? Did I "reset" the LCD by disconnecting/reconnecting the battery? Why did it quit when I quickly recycled the key on/off/on?
The car had been setting for about a month. I went to crank it. The display came on. The engine almost cranked. I turned the key off/on to recycle the fuel pump. When I turned the key on to crank it....no display. The engine cranked, but no display. Turned it off. I recranked the engine, still no display. I disconnected the battery, let it sit overnight. Reconnected the battery, turned the key on...display working. Cranked engine, display working. Any explanation? Did I "reset" the LCD by disconnecting/reconnecting the battery? Why did it quit when I quickly recycled the key on/off/on?
Instructor
Joined: Apr 2012
Posts: 194
Likes: 131
From: NJ
2025 Corvette of the Year Finalist - Modified
2024 C4 of the Year Winner - Modified
Might be a loose connection somewhere, or the auto-dimming sensor might be shot, making it go dim even if there's enough light.
Instructor
Joined: Apr 2012
Posts: 194
Likes: 131
From: NJ
2025 Corvette of the Year Finalist - Modified
2024 C4 of the Year Winner - Modified
I would start by checking all connections to the dash, then checking the wiring harness. If that all looks good, the problem might be inside the cluster itself.
Melting Slicks
Joined: Jan 2014
Posts: 2,192
Likes: 381
From: Lunenburg MA
I'd replace the board connector in the instruments panel.
https://batee.com/collections/84-89-...tor-repair-kit
https://batee.com/collections/84-89-...tor-repair-kit
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Joined: Jun 2024
Posts: 87
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If you're electronically inclined, buy the wiring harness from Batee so you can do bench testing. It comes with a power supply.
There's a connector between the two PCBs which corrodes, gets hot, and makes a lousy connection between the two boards. Mine also developed a bad solder joint between the two, so I touched that up with my soldering iron.
There's a connector between the two PCBs which corrodes, gets hot, and makes a lousy connection between the two boards. Mine also developed a bad solder joint between the two, so I touched that up with my soldering iron.
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