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Corvette
C4 Forum
87 Vette Dash cluster issues
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<blockquote data-quote="Live Wire" data-source="post: 254454" data-attributes="member: 6133"><p>Your dash display power supply is shot. Here's the clue: Your voltage indicator function compares the 12 volts provided by the power supply inside the display, to the battery voltage from the car itself. Normally, it will see 1 or 2 volts above, and assigns a value of 12 + 1 (or 2), and displays 13. However, if the voltage coming out of the power supply is low, say, 7, then it sees 5 volts above the power supply voltage that it thinks is 12, but is really 7. It then displays 12 + 5 = 17 volts. Between that and the occasional jibberish display, it's a dead giveaway that the power supply is failing. It actually sounds like a capacitor is slowly failing.</p><p>All you need to do is order a new power supply and solder it in. Batee.com provides two ways to do this: One way is to buy the parts replacement kit and replace individual pieces on the power supply board. This is cheap, but unless you are an electronics whiz, don't try it. You can buy a full power supply on a board, and it comes with a ribbon cable to solder. This is a bit more expensive, but totally worth the ease of repairing. If you don't think you're up to some soldering, it shouldn't be too tough to find a neighbourhood kid that likes electronics, or someone with some soldering experience to do this.</p><p>Have fun!</p></blockquote><p></p>
[QUOTE="Live Wire, post: 254454, member: 6133"] Your dash display power supply is shot. Here's the clue: Your voltage indicator function compares the 12 volts provided by the power supply inside the display, to the battery voltage from the car itself. Normally, it will see 1 or 2 volts above, and assigns a value of 12 + 1 (or 2), and displays 13. However, if the voltage coming out of the power supply is low, say, 7, then it sees 5 volts above the power supply voltage that it thinks is 12, but is really 7. It then displays 12 + 5 = 17 volts. Between that and the occasional jibberish display, it's a dead giveaway that the power supply is failing. It actually sounds like a capacitor is slowly failing. All you need to do is order a new power supply and solder it in. Batee.com provides two ways to do this: One way is to buy the parts replacement kit and replace individual pieces on the power supply board. This is cheap, but unless you are an electronics whiz, don't try it. You can buy a full power supply on a board, and it comes with a ribbon cable to solder. This is a bit more expensive, but totally worth the ease of repairing. If you don't think you're up to some soldering, it shouldn't be too tough to find a neighbourhood kid that likes electronics, or someone with some soldering experience to do this. Have fun! [/QUOTE]
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Corvette
C4 Forum
87 Vette Dash cluster issues
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