S4 won't turn on unless replacing battery, then turns off after two seconds?

[jakamon]

When unable to get to boot or even safe boot, when you get at most a 1 second glimpse of an empty battery or every once in a while the word "Samsung" for 1 second, the black again, this might be your problem and solution:

Problem: Galaxy S4 would not turn on, and would not charge. Plugging in would once in a while show an empty battery for 1 second, then go black (never showed charged or charging battery). Tried power boot (power + volume up + home key all at once) several times. One time saw the Samsung boot msg for 1 second, then black again.
Several people suggested it was the USB charge port dirty or bent, or dirty battery contacts. Nope. None of the suggestions got me more than 1 second of either battery or "Samsung" then black screen again.

Cause: When you take the back cover off and look at back of phone, there are 2 pressure switches above and to the right of the battery. (there are also 2 smaller points on left, ignore them). The pressure contact switches are delicate push-down contact switches, that were no longer being pushed down enough, so they were not making contact.

Solution: Gently lift / bend up the rolled (bigger) end of the switch until it stays just slightly above the indent it is seated in. Remember, these are delicate, so don't brute them, but you do have to bend / lift them a little. Put cover back on, and presto, now it boots, and does everything it should. Can now see the battery was 89% charged but it did not matter until I lifted / slightly bent-up these switches and put the cover back on.

 

[Nassour Kalombola]

my phone is doing the same ****. How can i clean this power button? I have my phone opened up, and the button looks mint. Everything around it (on the board) is mint. I plugged just the screen in and it does the same thing when i put the battery in, even though the button isn't even touching anything. I tried pulling the button out slightly with tweezers, and it still doesn't help.

Edit.. I ripped the button off the board lmao all is working good now

mayn like charm

 

[lorwill]

thank you dharmil, it worked.

 

[Okiedog63]

Positive switch action (click) from tact contact in switch body. Continuity demonstrates that contacts operate properly. I am curious about a 2.5 ohm reading across switch when open. Is this normal or should there be a much higher reading?
The "on" circuit is a trace that is pulled up by a resistor, either discrete or in a semiconductor. The switch provides a active low when depressed. The turn on circuit sees the logic shift and the phone powers up. But, what resistance should normally be measured across the circuit?