SIM CARD PANIC BUTTON FULL

So in this case, you can inject voltage into the bottom board to find the short.If the short clears, then the short is present on the bottom board.If the short is still present, the culprit will be on the top board somewhere.Then you can check to see if the short is still present when connecting the top layer to the DC Power Supply by itself.Since this is a 2 layer board, you can split the sandwich into 2 separate parts, top board & bottom board. Often, you'll find corrosion on capacitors but also under ICs. If you have a case of water damage, then you'll have to pay attention to the spots on the board where there's signs of water damage. Replacing it means you are adding more heat to the board to reinstall it, which increases the risk of something going wrong. The device will function normally with no negative effects. In these cases, you can just remove the shorted capacitor and not replace it. You'll need to inject voltage (4 V / 2 A) directly into the line you measured as short and use freeze spray (see here ) or thermal camera (see here: ) to spot the capacitor that is shorted. Rigel (U4400) - This is a bit rare but it does happen.U_NFC - In some cases, the chip itself can crack & cause a short within the bottom board.PP_VDD_BOOST - This line is usually shorted when it's not VDD MAIN.PP_VDD_MAIN - This is the most likely line to be shorted.If there is no water damage, is is most likely a shorted capacitor on any of the below lines: You're looking for any signs of corrosion on or around components and ICs. Remove the foam around the connectors to get a better look at everything.

SIM CARD PANIC BUTTON FULL

Pull 2A or more before prompt to boot on DC Power Supplyĭo a full visual inspection of the board and check for water damage under the stickers on the back.

16.6 Front front flex connector (J7900).16.3 Charge port / dockflex Connector (J8200).15 What if I don't have the original NAND data?.

7 You'll want to check these first to confirm you have a board issue:.

Sim card panic button