EEVblog Electronics Community Forum
A Free & Open Forum For Electronics Enthusiasts & Professionals
Welcome,
Guest
. Please
login
or
register
.
Did you miss your
activation email
?
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
This topic
This board
Entire forum
Google
Bing
Home
Help
Search
About us
Links
Login
Register
EEVblog Electronics Community Forum
»
Electronics
»
Repair
»
Network cable tester fault seeking help
« previous
next »
Print
Search
Pages: [
1
]
Go Down
Author
Topic: Network cable tester fault seeking help (Read 224 times)
0 Members and 1 Guest are viewing this topic.
daisizhou
Frequent Contributor
Posts: 926
Country:
Network cable tester fault seeking help
«
on:
January 02, 2025, 04:21:31 am »
Network cable tester "Smart Mouse" NF-168,Fault in wiring function.
Upon inspection of the motherboard, it was discovered that one U4 chip was damaged.
Unfortunately, the model has been erased. Does anyone know what type of chip this is?
Logged
daisizhou#sina.com #=@
BreakingOhmsLaw
Frequent Contributor
Posts: 394
Country:
Certified solder fume addict
Re: Network cable tester fault seeking help
«
Reply #1 on:
January 03, 2025, 07:23:53 pm »
Probably this is just a button, connected to a binary counter, connected to a BCD-to-n decoder. 74LS145 or equivalent.
Logged
wraper
Supporter
Posts: 17952
Country:
Re: Network cable tester fault seeking help
«
Reply #2 on:
January 03, 2025, 07:29:15 pm »
To me it looks like a drop of rosin flux, not damage. You didn't say what's an exact issue but 455kHz ceramic resonator present on PCB is quite fragile and often fails when device is dropped.
Logged
Print
Search
Pages: [
1
]
Go Up
« previous
next »
Share me
Smf
EEVblog Electronics Community Forum
»
Electronics
»
Repair
»
Network cable tester fault seeking help
There was an error while thanking
Thanking...
EEVblog Main Site
EEVblog on Youtube
EEVblog on Twitter
EEVblog on Facebook
EEVblog on Odysee