Re: Catapillar ECU repair, need N548AB replacement?
If it really is a suicide battery, I wonder what got lost...
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Re: Catapillar ECU repair, need N548AB replacement?
Great job desoldering all that, that's a lot of work
I would beep out the ECU connector pins to see what they end up connecting to. Because of the big TO-247 package and heatsinking, wild guess is the fuel rack solenoid, as a high current load.
I'll check with someone in the business, but there might be a HV DC-DC converter sometimes to make say 100VDC for driving big solenoid loads and the mosfets might be for that. I'd think they get power from the big caps, not from 24VDC.Leave a comment:
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Re: Catapillar ECU repair, need N548AB replacement?
No Sir! I tried my darnedest to find a spec sheet on that N548AB and found diddly squat! There are not even any markings on these 3 legged caps. But I did figure out that this ECU came out of a 2007 Catapillar MXS engine.Leave a comment:
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Re: Catapillar ECU repair, need N548AB replacement?
can you find a datasheet ? i sure couldn't .Leave a comment:
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Re: Catapillar ECU repair, need N548AB replacement?
I was surprised to see that in there too.Leave a comment:
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Re: Catapillar ECU repair, need N548AB replacement?
HMMMM.......
is that a "suicide battery" i see!!!Leave a comment:
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Caterpillar ECU repair, need N548AB replacement?
I've got a Catapillar ECU here from an 18 wheeler. Complaint: Effer doesn't start! Nice!
Well here we go: open up the ECU and you get greeted with 70 pins of Catapillar madness!
It takes a bit of time to desolder 70 pins and some prying to get it out. 
Underneath that main board is another board with all the Power goodies. You thing the 70 pins are hard? This bottom board is a real pain to figure out what pins to unsolder in order to get it out.
However I did get that power board out too. Only took me almost 3 hours to get those 2 boards off and that is with using a heat gun and a desoldering at the same time. 
Had to empty the desoldering gun 5 times! It's probably close to 100 pins to desolder before one gets anywhere in this thing. 
So what's the problem again? No start. The victims this time are 2 Fairchild N548AB in a TO247 SHT package. Dead short.
Now to my problem: With what do I replace these? I can't find anything much useful about them besides that they are discontinued.
Here is some ECU porn.
Attached Files -
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
This is a new item at Electronic GoldMine that has arrived within the last few weeks
Here is the link for them I know for sure that it works because ( I tried it on mine soldering station ) I bought two of them and I just bought two more of them so I have some extra replacement ones in my parts bin
Stahl Tools DDDS Replacement Iron for DSDS Stahl Solder Station
https://theelectronicgoldmine.com/products/g28392
One note it will not work for the ZD-917 or similar model number that does not have the sleep function that are the same iron but the plug only...11-24-2024, 01:25 AM -
Hi everyone,
Sorry for the person who’s going to read all this !
I'm on a Nintendo Switch Lite, motherboard HDH-CPU-02.
While replacing the left joystick, I had to remove the motherboard to access the connector underneath. When I lifted the LCD connector latch, it broke (the plastic had become brittle over time), so I replaced the entire connector.
During the desoldering of the LCD connector using hot air, three small components located just below the connector (likely 0402 capacitors) came off and remained stuck to the bottom of the... -
Hello, I search this connector (oxydated).
It's a fpc zif low profile connector. It come from camera sensor, it is very small : 0.3mm between 2 pins.
I ordered 2 from Aliexpress called « 0.3mm pitch » but one was 0.5mm between 2 pins and the other 0.6mm. In fact « 0.3mm pitch » seams to be the pad width and not the distance between 2 pins.
I can't find it. The other websites like mouser dont show the datasheet, and I can't check if it is 0.3mm between 2 pins ?
Do you know how to find this connector please ? What is the exact name for find it ?
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Hi,
I have a Dell Latitude 5590 with motherboard LA-F411P Rev 1.0 that has liquid damage and doesn't turn on anymore when only the charger is plugged in. However, it does turn on when powering it from a battery. I couldn't find schematics for this exact board, but LA-F401P seems to be similar (that post says LA-F411P, but the attached schematics are actually for LA-F401P): https://www.badcaps.net/forum/troubl...oardview-neede...
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