Problem with Digital Dash Lighting 87
Thread Starter
Race Director
Joined: Sep 2005
Posts: 13,269
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From: Sharpsburg Georgia
GA Events Coordinator
Problem with Digital Dash Lighting 87
My 87 has developed a problem with the lighting on the dash.
It has new bulbs, and the holders are ok.
It looks like it has lost the ground from where the bulb holders go, to the pins on the circuit board where the two boards go together.
They all went dead at one time and now the turn signal and the high beam indicators stay on all the time. (got power and these lights are grounding via the turn signal and head lamp bulbs).
With all the bulb holders out, I have no continuity from the ground side of any of the strips where the bulb holders make contact to any of the pins that connect the two boards together.
It does have continuity to the big square (heat sink???) that has what looks like a power transistor riveted to the square.
Every thing else as far as the LED displays are working, it is just real hard to see them.
Does Any one have any thoughts on this?
I am leaning toward it needing a new circuit board.
Greg
It has new bulbs, and the holders are ok.
It looks like it has lost the ground from where the bulb holders go, to the pins on the circuit board where the two boards go together.
They all went dead at one time and now the turn signal and the high beam indicators stay on all the time. (got power and these lights are grounding via the turn signal and head lamp bulbs).
With all the bulb holders out, I have no continuity from the ground side of any of the strips where the bulb holders make contact to any of the pins that connect the two boards together.
It does have continuity to the big square (heat sink???) that has what looks like a power transistor riveted to the square.
Every thing else as far as the LED displays are working, it is just real hard to see them.
Does Any one have any thoughts on this?
I am leaning toward it needing a new circuit board.
Greg
Race Director
Joined: Jun 2005
Posts: 17,640
Likes: 1
From: Lenoir City TN
St. Jude Donor '08-'09-'10-'11
When I first got my 86 it would do this and a light tap on the dash would cure it. It would do it about once a month or if I hit a big bump, I took the instrument cluster out polished all the connections and cleaned everything up and it never did it again after that. Maybe your can be easily fixed like mine. This is a common problem, some recommend looking at the solder joints and checking the grounds at the transmission (I think others will chime in). Good luck.
Bob
Bob
Thread Starter
Race Director
Joined: Sep 2005
Posts: 13,269
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From: Sharpsburg Georgia
GA Events Coordinator
Hi Bob, did your turnsignal and hig beam indicators come on when your lights went out?
Mine did this on one or two bulbs after I replaced them all until they all stoped and the indictor lights cam on all the time.
Mine did this on one or two bulbs after I replaced them all until they all stoped and the indictor lights cam on all the time.
When I first got my 86 it would do this and a light tap on the dash would cure it. It would do it about once a month or if I hit a big bump, I took the instrument cluster out polished all the connections and cleaned everything up and it never did it again after that. Maybe your can be easily fixed like mine. This is a common problem, some recommend looking at the solder joints and checking the grounds at the transmission (I think others will chime in). Good luck.
Bob
Bob
Race Director
Joined: Jun 2005
Posts: 17,640
Likes: 1
From: Lenoir City TN
St. Jude Donor '08-'09-'10-'11
yeppers
The right and left were on as well as the blue high beam indicator, and as you said above the LCD still reads the correct information just dim since there is no backlighting.
Bob
The right and left were on as well as the blue high beam indicator, and as you said above the LCD still reads the correct information just dim since there is no backlighting.
Bob
Le Mans Master
Joined: Aug 2003
Posts: 9,884
Likes: 3
From: Magnolia Mississippi
St. Jude '03-'04-'05-'06-'07
http://www.batee.com/corvette/
good site for diags for digital dash, if you have both indicators and high beam lit all the time, its a ground issue...
Reference the site, it lines it all out.
good luck
good site for diags for digital dash, if you have both indicators and high beam lit all the time, its a ground issue...
Reference the site, it lines it all out.
good luck
