Here is the [https://www.scribd.com/document/632468808/Samsung-S20-G780F-Service-Manual|service manual] that may help.
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Here is the [link|https://www.scribd.com/document/632468808/Samsung-S20-G780F-Service-Manual|service manual] that may help.
It's a bit hard to use online but it can be done, just scroll down the page. To download it you need to subscribe to the website.
It may depend on what frequency the 2G network uses in your location so scroll down to sections ''***8-4-33.*** GSM 850/900 TX'' or ***''8-4-34.''*** GSM 1800/1900 TX to view the troubleshooting flowcharts if there's a problem with the 2G transmit signal from the phone.
Earlier in the manual you will find the board layout diagrams which shows the location of the components mentioned in the flowcharts and also an electrical parts list which shows the Samsung part numbers for each component.
If a component is found to be faulty, search online using the ''part number only'' to find suppliers that suit you best.
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''Note:'' It is better if you can download the service manual because it most probably is a .pdf file and you can then zoom in on the board layout diagrams which makes it a lot easier to find the components mentioned in the flowchart. You can use the search function in your computer e.g. (Ctrl + F keys if using a Windows PC) to do this. You can use this method to find the component in the parts list as well. Just search for the component's board designation e.g. L1017 (1st component mentioned in the flowchart 8-4-33)
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''Note:'' It is better if you can download the service manual because it most probably is a .pdf file and you can then zoom in on the board layout diagrams which makes it a lot easier to find the components mentioned in the flowchart. You can use the search function in your computer to do this, e.g. Ctrl + F keys if using a Windows PC. You can use this method to find the component in the parts list as well. Just search for the component's board designation e.g. L1017 (1st component mentioned in the flowchart 8-4-33)
Hi @novgorod
Here is the [https://www.scribd.com/document/632468808/Samsung-S20-G780F-Service-Manual|service manual] that may help.
It's a bit hard to use online but it can be done, just scroll down the page. To download it you need to subscribe to the website.
It may depend on what frequency the 2G network uses in your location so scroll down to sections ''***8-4-33.*** GSM 850/900 TX'' or ***''8-4-34.''*** GSM 1800/1900 TX to view the troubleshooting flowcharts if there's a problem with the 2G transmit signal from the phone.
Earlier in the manual you will find the board layout diagrams which shows the location of the components mentioned in the flowcharts and also an electrical parts list which shows the Samsung part numbers for each component.
If a component is found to be faulty, search online using the ''part number only'' to find suppliers that suit you best.
''Note:'' It is better if you can download the service manual because it most probably is a .pdf file and you can then zoom in on the board layout diagrams which makes it a lot easier to find the components mentioned in the flowchart. You can use the search function in your computer e.g. (Ctrl + F keys if using a Windows PC) to do this. You can use this method to find the component in the parts list as well. Just search for the component's board designation e.g. L1017 (1st component mentioned in the flowchart 8-4-33)