3 
1 dock flex tester to trouble shoot issuses
Hi community i am trying to trouble shooting a samsung a51 it wont charge or turn on im useing dock flex tester not sure if im using it correctly or even know what to do with the values. im still learning and trying to understand how phones work. i got the schematics, I cant find any information on the internet on how to use these dock flex connectors it looks like people are only selling them. in my search i found out the iphone uses tristar i wondering what the andriod version is. these question are probaly very noobish but i need to start someone to understand how the phones work and troubleshoot. i have basic understanding of electronics i purchased a course on udemy to learn about mobile phones micro soldering ect but the explanations are very vague and wish to learn more about mobile phones. If someone could please point me in the wright direction to have a better understanding that would be greatly preciated. thanks
crwdns2934109:0crwdne2934109:0
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crwdns2944067:05crwdne2944067:0
@mrfixit8978 do you have some sort of make or model for this "dock flex tester"? That way we can all be in the same book...;-)
crwdns2934271:0crwdnd2934271:0 oldturkey03 crwdne2934271:0
Its made by OSS TEAM, Dock Flex Tester USB C it seems tobme to be a standard Chinese one it has A1-A12 on one side other side B1-B12
crwdns2934271:0crwdnd2934271:0 Mrfixit crwdne2934271:0
For more info i have messured battery voltage is fine i replaced the Main Board Flex Cable because i belive i damaged it when opening the case. There could be an issue with the Main C to C CON as when i was inspecting it under the microscope there was some bits of the old Main Board Flex Cable stuck in it. A simple solution would be to just replace the whole SUB PBA. Althought I would like to dive deeper in finding the component thats the problem useing the multimeter/microsolderong where needed. Any advice would be great.
crwdns2934271:0crwdnd2934271:0 Mrfixit crwdne2934271:0
Doing further research i might as well just replace the whole SUB PBA. I would like know how to use the dock flex tester tho going back to the orginal post. Sorry went a it off topic.
crwdns2934271:0crwdnd2934271:0 Mrfixit crwdne2934271:0
Just to add more information about this device i have links here https://drive.google.com/drive/folders/1...
This shows the usb safety tester data
This phone was working before i took the back cover off
crwdns2934271:0crwdnd2934271:0 Mrfixit crwdne2934271:0