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HP Recommended
HP ELITEBOOK 840 G4
Microsoft Windows 10 (64-bit)

USB3 Port Failure - Missing Ribbon Cable Connector on M/B

My left-side USB3  port on Elitebook 840 G4 wont recognise/power any USB devices & fails the BIOS hardware test - on investigation it seems this ribbon connector is missing on my machine! 
To repair the USB3 port can I buy JUST this cable as a spare part from HP ? (FYI - I can't find one listed anywhere on eBAY !!)  or do I need to buy the whole USB/VGA sub-board unit from HP  - p60 of Service Manual ? Part:  L17979-001 - even this seems hard to source - HP's on UK spares site doesnt seem to  recognise  L17979-001   ??

Any advice greatfully received -thanks

1 ACCEPTED SOLUTION

Accepted Solutions
HP Recommended

Hi,

Just to be sure what we are talking about. You say the connector is missing on the motherboard? Or the cable which goes from VGA/USB board to motherboard is missing?

On page 61 of the service manual, you can see the part we are discussing. I do not believe you are looking at the correct service manual. As the part has part number 916922-001 and is available in HP parts store in the UK (not real expensive).

Service manual:

http://h10032.www1.hp.com/ctg/Manual/c05357618

Part:

https://parts.hp.com/hpparts/Search_Results.aspx?mscssid=F5D0EBF3F0C34609908CDA18DF9428D0&SearchIn=P...

 

So if the cable is missing or damaged, replacing the part should solve the problem.

 

Hope it helps,

David

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Please click on accept as solution if answered your question

View solution in original post

4 REPLIES 4
HP Recommended

Cables don't just mysteriously disappear from notebook PCs.

 

A more likely cause is that the owner has inadvertently damaged the port.

 

Replacing the VGA/USB board is unlikely to repair the issue unless you can see obvious physical damage to the port. You can try it if you like.

 

If the hardware test shows a fail, then a system board replacement is more likely to resolve the problem. 



I am a volunteer forum member, not an HP employee. If my suggestion solved your issue, don't forget to mark that post as the accepted solution. If my post was helpful or you just want to say thanks, click on the Yes button next to the "was this reply helpful?"



HP Recommended

..inherited this G4 unit..USB port seems in-tact its just that  the gold ribbon connector cable is missing so dont think the M/B is an issue as no other problems with laptop. Just having difficulties sourcing the replacement cable - or more likely the entire VGA/USB3 sub-board as a unit. I presume if I can locate one of these units  I can simply disconnect take the cable & fit it on the existing VGA/USB3 sub-board without a big disassembly ?

But HP doesnt seem to supply a spare VGA/USB3 sub-board ! -   the unit does not even seem to be listed in the 840 G4 Service manual ?  Any guidance on where I can get hold of the missing cable (or entire VGA/USB3 sub-board) ?

Most kind

HP Recommended

The only place you will get a cable is likely to be from the second-hand market from a broken notebook. Good luck with that.

 

BREXIT has no hit yet, so you can still order the complete board from an online vendor source at the following search I did.

 

https://www.google.com/search?q=HP+L17979-001&oq=HP+L17979-001&aqs=chrome..69i57j69i64l3.2031j0j7&so...

 

I had no problem sourcing the part, even in the UK.  You might consider using a different search engine for your searches in the future.



I am a volunteer forum member, not an HP employee. If my suggestion solved your issue, don't forget to mark that post as the accepted solution. If my post was helpful or you just want to say thanks, click on the Yes button next to the "was this reply helpful?"



HP Recommended

Hi,

Just to be sure what we are talking about. You say the connector is missing on the motherboard? Or the cable which goes from VGA/USB board to motherboard is missing?

On page 61 of the service manual, you can see the part we are discussing. I do not believe you are looking at the correct service manual. As the part has part number 916922-001 and is available in HP parts store in the UK (not real expensive).

Service manual:

http://h10032.www1.hp.com/ctg/Manual/c05357618

Part:

https://parts.hp.com/hpparts/Search_Results.aspx?mscssid=F5D0EBF3F0C34609908CDA18DF9428D0&SearchIn=P...

 

So if the cable is missing or damaged, replacing the part should solve the problem.

 

Hope it helps,

David

Please click on thumbs up for thanks

Please click on accept as solution if answered your question

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