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Old 09-18-2021, 06:29 AM   #26
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Join Date: Jul 2011
City & State: Some times Sunny Jacksonville FL
My Country: USA
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Posts: 3,081
Default Re: Catapillar ECU repair, need N548AB replacement?

My question is how would it work if the gate was left floating on the fets I do quite understand how this would work

This is why I do not like devices that have stacked multiple trace boards on each other because it very difficult to trace out not completely impossible but almost impossible to do

Is ECU that expensive that you have to repair it or is for a learning experience which in both cases I completely understand because I have done both
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching 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 ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board

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

Last edited by sam_sam_sam; 09-18-2021 at 06:48 AM..
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