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Old 01-01-2019, 03:59 PM   #1
Rocky1983
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Default Help identifying components

Hey guys Iím having a bit of an issue identifying some components on a circuit board and was hoping someone could possibly help me out. The board is from my dash panel in my car and itís died or rather voltage protection has kicked in as itís seeing 24v instead of 12v Iíve narrowed it down to some resistors mounts on the board through trail and error but canít find the values anywhere to order some replacements the first pic is a group of 5 in the centre and the second pic is a resistor on its own. I say resistor but Iím not 100% sure.

I realise Iím asking a lot but I really need help and cant think of anything else to try.

Many thanks in advance

Neil
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File Type: jpeg D84F8A85-3CD0-4C00-991F-E9BC30FAA18F.jpeg (196.4 KB, 16 views)
File Type: jpeg 2DB5CB71-3E54-40CB-B9EA-96344767B61E.jpeg (66.4 KB, 11 views)
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Old 01-01-2019, 05:05 PM   #2
petehall347
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Default Re: Help identifying components

wondering if they could be colour coded fuses ..
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Old 01-01-2019, 05:47 PM   #3
Rocky1983
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Default Re: Help identifying components

I’m not sure my friend I thought they were melf resistors. When I applied abit of heat trying the see if there were any dry joints the voltage reading changed. Also I measure resistance with my fluke and got a reading but am unsure if the value given is correct
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Old 01-01-2019, 07:06 PM   #4
petehall347
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Default Re: Help identifying components

cant remember seeing resistors like that before .
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Old 01-01-2019, 07:23 PM   #5
R_J
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Default Re: Help identifying components

They are melf resistors
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Old 01-01-2019, 08:03 PM   #6
Rocky1983
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Default Re: Help identifying components

Sweet do you know how I can read the values Iím sorry but I canít seem to see the beginning or end as they look pretty evenly banded.
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Old 01-01-2019, 08:25 PM   #7
R_J
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Default Re: Help identifying components

it will be the standard resistor color code, the dots are near band 4 or band 6 and are TC (Temperature Coefficient Marking)
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Last edited by R_J; 01-01-2019 at 08:35 PM..
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Old 01-01-2019, 08:53 PM   #8
Rocky1983
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Default Re: Help identifying components

Thanks buddy I’ll look at the ones without the dotted bands and try and make an educated guess
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Old 01-01-2019, 09:03 PM   #9
R_J
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Default Re: Help identifying components

What do you mean by "voltage protection has kicked in as it’s seeing 24v instead of 12v" I doubt the resistors are bad
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Old 01-03-2019, 05:09 AM   #10
sam_sam_sam
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Default Re: Help identifying components

Quote:
Originally Posted by R_J View Post
it will be the standard resistor color code, the dots are near band 4 or band 6 and are TC (Temperature Coefficient Marking)
Thanks for sharing this chart
__________________
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Desk Top Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *


These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
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