Samsung GT-I5700 disassembly

05.04.2011 22:38

I've already said plenty of bad things about the Android-powered mobile phone I bought nearly a year ago, so I'll refrain from repeating myself. I tore it down the other day to see if anything could be done to fix the highly annoying contact bounce the lock-unlock button developed lately. And also to satisfy my curiosity by poking around this made-for-the-scrapyard device.

Samsung GT-I5700 with the PCB exposed

Removing the back to expose the (single) PCB was pretty straightforward: six screws and some plastic brackets. There's a black GSM/UMTS antenna block attached to the back of the shell (under the keys) and three more similar contacts at the top in the shell itself. It looks like something is embedded into the white plastic, possibly a Wi-Fi, Bluetooth or GPS antenna. Connections to all of these are merely by gold-plated springs that push agains the back side when the phone is put together.

Samsung GT-I5700 PCB turned over

The backside of the PCB contains all the integrated circuits and is connected to everything else via tiny SMD connectors and bits of flexible PCB. The CPU has an RF shield that is basically conductive rubber ring that presses against the PCB and the aluminum frame. There's also a tiny backup battery on the right side.

Flexible PCB connections in Samsung GT-I5700

The PCB is held in place with a single screw at the top. The bottom hangs freely, giving the phone a distinctive tunning-fork-feeling it you knock on it.

I admit I haven't seen the inside of many phones, but this one got surprisingly dusty in less than a year of use (in what I consider a clean environment). The rubber seals around the holes in the casing obviously proved to be insufficient protection against the environment.

In the end, I tested the tiny SMD push button and it didn't seem to behave any differently than the other buttons, so I left it as it is. It's probably a better idea to replace everything else around that button.

Posted by Tomaž | Categories: Digital

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