Motherboard ground connector not picking on mulitimeter

eidairaman1 · Jan 18, 2025

ShrimpBrime said:
Here is a 24 pin circuit diagram for an MSI MS-7540. This may not be a direct representation to the B450 motherboard, but won't be much different as far as grounds are concerned.

Hope this helps.

View attachment 380515

Also at OP keep in mind the dot represents a connection of 2 conductors/traces and the lack of means they should not be connected.

ShrimpBrime · Jan 18, 2025

eidairaman1 said:
Also at OP keep in mind the dot represents a connection of 2 conductors/traces and the lack of means they should not be connected.

Correct. Power switch is not grounded directly to any power supply pin, at least in that diagram. It is PS power on/off and SB gets power first typically. I like motherboards that use the SB LED indicator, that helps ensure that circuit is powered.

qxp · Jan 23, 2025

Jaegar said:
Thank you. This is what I wondering about because pin 17 doesn't register continuity like the rest of the ground pins

Looking at the diagram from ShrimpBrime below, pin 17 is electrically connected to other pins for the motherboard MS-7540. Can you try to measure continuity between pins on the connector itself ? Such as 17 and 18. Wiggle probes lightly to see if the multimeter beeps.

Also, is there any way you can post pictures of the area near your connector ? Ideally both front and back.

ShrimpBrime said:
Here is a 24 pin circuit diagram for an MSI MS-7540. This may not be a direct representation to the B450 motherboard, but won't be much different as far as grounds are concerned.

Hope this helps.

View attachment 380515

System Name	PCGOD
Processor	AMD FX 8350@ 5.0GHz
Motherboard	Asus TUF 990FX Sabertooth R2 2901 Bios
Cooling	Scythe Ashura, 2×BitFenix 230mm Spectre Pro LED (Blue,Green), 2x BitFenix 140mm Spectre Pro LED
Memory	16 GB Gskill Ripjaws X 2133 (2400 OC, 10-10-12-20-20, 1T, 1.65V)
Video Card(s)	AMD Radeon 290 Sapphire Vapor-X
Storage	Samsung 840 Pro 256GB, WD Velociraptor 1TB
Display(s)	NEC Multisync LCD 1700V (Display Port Adapter)
Case	AeroCool Xpredator Evil Blue Edition
Audio Device(s)	Creative Labs Sound Blaster ZxR
Power Supply	Seasonic 1250 XM2 Series (XP3)
Mouse	Roccat Kone XTD
Keyboard	Roccat Ryos MK Pro
Software	Windows 7 Pro 64

System Name	I don't name my rig
Processor	14700K
Motherboard	Asus TUF Z790
Cooling	Air/water/DryIce
Memory	DDR5 G.Skill Z5 RGB 6000mhz C36
Video Card(s)	RTX 4070 Super
Storage	980 Pro
Display(s)	Some LED 1080P TV
Case	Open bench
Audio Device(s)	Some Old Sherwood stereo and old cabinet speakers
Power Supply	Corsair 1050w HX series
Mouse	Razor Mamba Tournament Edition
Keyboard	Logitech G910
VR HMD	Quest 2
Software	Windows
Benchmark Scores	Max Freq 13700K 6.7ghz DryIce Max Freq 14700K 7.0ghz DryIce Max all time Freq FX-8300 7685mhz LN2

Motherboard ground connector not picking on mulitimeter

eidairaman1

The Exiled Airman

ShrimpBrime

qxp