MSD80 MOSFET issue

wkh023002 · 02-25-2018, 02:13 AM

I removed the DME today, i carried out the continuity test by multimeter. I found MOSFETS 2 &3 has issue which correlates to my misfire of Cyl2 & 3. However, i also carried out test for other MOSFETs, which i am not sure which they relate to, I found that 2 small MOSFETS also had issue, it should be the two small MOSFETS at Power Drive section on the circuit board. I test it , the Left middle and right leg has reading on multimeter.

Anyone know will these 2 small MOSFET also affecting some function on my car??
Will n54dmerepair could help to replace them as well other than the 6 Injector Drive.

RocketSurgeon · 02-25-2018, 02:31 AM

If you suspect the MOSFET is bad, just read the numbers off it and buy replacements. MOSFETs are dirt cheap.
I strongly suggest you replace all the injector and coil mosfets, and perhaps the others you suspect of being bad. Mouser or digikey almost certainly stocks all of them.
Have a local electronics repair shop replace them for you. That site you posted is WAYY overpriced. I helped a local girl with a MOSFET failure, she got 6 mosfets for like $16 and paid $70 to have an electronics shop solder them on, car fixed for $86.
Phone repair shops are great for stuff like that, they do hot air reflow work all the time. Google reviews will help you find a good one.

The_E92_Fan · 02-25-2018, 11:57 AM

Quote:

Originally Posted by RocketSurgeon

If you suspect the MOSFET is bad, just read the numbers off it and buy replacements. MOSFETs are dirt cheap.
I strongly suggest you replace all the injector and coil mosfets, and perhaps the others you suspect of being bad. Mouser or digikey almost certainly stocks all of them.
Have a local electronics repair shop replace them for you. That site you posted is WAYY overpriced. I helped a local girl with a MOSFET failure, she got 6 mosfets for like $16 and paid $70 to have an electronics shop solder them on, car fixed for $86.
Phone repair shops are great for stuff like that, they do hot air reflow work all the time. Google reviews will help you find a good one.

Cant appreciate this enough. Its a really cheap and easy repair.

wkh023002 · 02-25-2018, 09:22 PM

Anyone knows what they relate to for these two MOSFETS?It is Power Drive section

wkh023002 · 02-25-2018, 09:24 PM

View post on imgur.com

wkh023002 · 02-25-2018, 11:16 PM

https://i.pinimg.com/originals/3e/6b...d2fcffd769.jpg

This is where it is called POWER DRIVE on the DME. I have no idea what it is

wkh023002 · 03-01-2018, 10:02 AM

push

wkh023002 · 03-01-2018, 10:04 AM

View post on imgur.com

Anybody has idea what they relate to??

02-25-2018, 02:13 AM	#1
wkh023002 Enlisted Member 7 Rep 35 Posts Drives: n54 335i E93 Join Date: Feb 2018 Location: Hong Kong iTrader: (0)	MSD80 MOSFET issue I removed the DME today, i carried out the continuity test by multimeter. I found MOSFETS 2 &3 has issue which correlates to my misfire of Cyl2 & 3. However, i also carried out test for other MOSFETs, which i am not sure which they relate to, I found that 2 small MOSFETS also had issue, it should be the two small MOSFETS at Power Drive section on the circuit board. I test it , the Left middle and right leg has reading on multimeter. Anyone know will these 2 small MOSFET also affecting some function on my car?? Will n54dmerepair could help to replace them as well other than the 6 Injector Drive.
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02-25-2018, 02:31 AM	#2
RocketSurgeon Lieutenant 269 Rep 459 Posts Drives: 2008 135i Manual, CBR650F Join Date: Jan 2017 Location: NC iTrader: (0)	If you suspect the MOSFET is bad, just read the numbers off it and buy replacements. MOSFETs are dirt cheap. I strongly suggest you replace all the injector and coil mosfets, and perhaps the others you suspect of being bad. Mouser or digikey almost certainly stocks all of them. Have a local electronics repair shop replace them for you. That site you posted is WAYY overpriced. I helped a local girl with a MOSFET failure, she got 6 mosfets for like $16 and paid $70 to have an electronics shop solder them on, car fixed for $86. Phone repair shops are great for stuff like that, they do hot air reflow work all the time. Google reviews will help you find a good one.
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02-25-2018, 09:22 PM	#4
wkh023002 Enlisted Member 7 Rep 35 Posts Drives: n54 335i E93 Join Date: Feb 2018 Location: Hong Kong iTrader: (0)	Anyone knows what they relate to for these two MOSFETS?It is Power Drive section
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02-25-2018, 09:24 PM	#5
wkh023002 Enlisted Member 7 Rep 35 Posts Drives: n54 335i E93 Join Date: Feb 2018 Location: Hong Kong iTrader: (0)	View post on imgur.com
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02-25-2018, 11:16 PM	#6
wkh023002 Enlisted Member 7 Rep 35 Posts Drives: n54 335i E93 Join Date: Feb 2018 Location: Hong Kong iTrader: (0)	https://i.pinimg.com/originals/3e/6b...d2fcffd769.jpg This is where it is called POWER DRIVE on the DME. I have no idea what it is
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03-01-2018, 10:02 AM	#7
wkh023002 Enlisted Member 7 Rep 35 Posts Drives: n54 335i E93 Join Date: Feb 2018 Location: Hong Kong iTrader: (0)	push
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03-01-2018, 10:04 AM	#8
wkh023002 Enlisted Member 7 Rep 35 Posts Drives: n54 335i E93 Join Date: Feb 2018 Location: Hong Kong iTrader: (0)	View post on imgur.com Anybody has idea what they relate to??
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