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#1 |
Registered User
![]() Join Date: Aug 2009
Location: Orange County, CA
Posts: 170
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Printed Circuit Board Question
If I'm changing the bulbs in the dark spots on my instrument panel, and nothing is happening, does that mean that l for sure need to replace the printed circuit board?
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#2 |
Registered User
![]() Join Date: Aug 2009
Location: Orange County, CA
Posts: 170
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Re: Printed Circuit Board Question
Nobody? I just don't want to waste the $60 on a new printed circuit board if there's another common problem that's causing the dark spots.
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#3 |
Registered User
Join Date: Jan 2016
Location: Barber City, CA
Posts: 4,783
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Re: Printed Circuit Board Question
try swapping some of the known good lamp/lamp holders around for a quick test, those mini bulbs can be finicky in those holders..
may need new lamp holders and or contact cleaning.. pocket screwdriver or similar tool with paper towel and contact cleaner may help.. can test the assemblies outside the dash with some test leads to a battery.. possibly need to take the cluster out to inspect/clean ribbon as necessary.. be gentle, plastic is fragile.. q-tip swabs and contact cleaner may do it.. be careful to keep the cleaner on the copper only as much as possible and apply light pressure.. crc and wd-40 electrical contact cleaners have worked well for me in other similar applications.. good luck! btw, where ya at in OC? |
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#4 |
Registered User
![]() Join Date: Aug 2009
Location: Orange County, CA
Posts: 170
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Re: Printed Circuit Board Question
Thanks for all of those tips! I guess I can find contact cleaner at Radio Shack?
I'm out in Corona now. |
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#5 | |||
Registered User
Join Date: Jan 2016
Location: Barber City, CA
Posts: 4,783
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Re: Printed Circuit Board Question
Quote:
lots of good tips added in, you should be in good shape after checking all of those things.. radio shack may be more difficult to find than the contact cleaner, lol.. as mentioned above, local auto parts house or home depot will have what you need.. Home Depot carries both of these; http://www.homedepot.com/p/CRC-QD-11...30-6/202262505 http://www.homedepot.com/p/CRC-11-oz...5103/205021975 product info QD® CONTACT CLEANER, 11 WT OZSKU02130 Quote:
![]() while we're on the subject, this type of product is useful for locations where you may not be able to apply direct contact.. they both serve pretty much the same function, just need to be sure components in incidental contact won't be harmed.. read the application guides and warnings and you should be good to go for trouble free electrical connections ![]() product info QD® ELECTRONIC CLEANER, 11 WT OZSKU05103 Quote:
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#6 |
Registered User
![]() Join Date: Aug 2009
Location: Orange County, CA
Posts: 170
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Re: Printed Circuit Board Question
I was able to find the red can. Thanks for all of the help!
I'm not sure whether or not the board is delaminatng. I guess I thought that the circuit board had to be disconnected from the back and pulled out from behind the dash for inspection. Laying on my back up in the floorboard. |
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#7 |
Registered User
Join Date: Apr 2013
Location: South Westerlo, New York
Posts: 1,325
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Re: Printed Circuit Board Question
If they're regular bulbs try what killer bee suggests, if switching to the LED bulbs, try turning the bulbs 180 degrees. the ones I put in only light one way.
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Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB. |
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#8 |
Registered User
Join Date: Jul 2017
Location: Pasadena, CA
Posts: 44
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Re: Printed Circuit Board Question
Check known good bulb holders first. Auto parts stores will carry the contact cleaner. A light scrubbing with scotch brite on the contacts will help too to remove oxidation. You can check continuity on your printed circuit with a meter.
![]() LED's like Hamjet mentioned are a worthwhile upgrade but they're polarity sensitive so flip them around if they don't light up. I did mine for $10. ![]()
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James 1971 Blazer 350/SM465/NP205 1966 Chevelle 468/TH400 2009 Corvette Z06 built LS7 |
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#9 |
Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,151
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Re: Printed Circuit Board Question
You can try to test the hot side of the PC Board at the bulb locations with a test light and see if you are getting power. Then test the ground side of each bulb. Then you would know where to chase the problem. Is the current PC board de-laminating?
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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#10 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,156
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Re: Printed Circuit Board Question
Just went through the same issue with my brand new circuit board. I had to burnish the contacts on the old bulb holders and some needed a slight tweaking of the contacts. I had to careful with the tweaking as the new circuit boards are so thin I was worried about damaging it with too much pressure.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#11 |
Registered User
Join Date: Mar 2009
Location: WARRENSBURG,MISSOURI,64093
Posts: 1,518
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A small piece of red scotch brite will clean up the circuit board traces very nicely!
Ben ![]()
__________________
"Persistence is the twin sister of Excellence.one is a matter of quality,the other, a matter of time" ![]() “Serious Black” my 1971 Short Bed Fleetside Sold to an outstanding man in Lees Summit,Mo. “Gone, but by no means,Forgotten” |
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#12 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Printed Circuit Board Question
Check the ground wire on the back. I had the same issue, added a ground wire to the back of the cluster to a solid clean metal on the firewall and presto. Lights worked again.
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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