iPhone 3GS endless reboot after battery replacement fix With a lot of iPhone 3GS units now requiring replacement batteries, but with no original batteries available, sometimes after a replacement when the power percentage drops to 30~50% the iPhone will turn off, but when you try to turn it back on again it goes in to an endless cycle of showing the Low-Battery screen and then attempting to start with the Apple logo, then restarting all over again in a minute or two. The exact cause of the problem isn't known, though a mismatch between the presumed or old battery charge curve and the new battery is likely. Mostly the iOS installed thinks that the battery still has 30~50% of power left when in fact it empty, a lot of this is because lithium cells have an exceptionally flat discharge curve and thus estimating the energy left is not always practical without keeping track of the mAh consumed. Put the iPhone 3GS into DFU/Recovery mode Hold down the power button for 4 seconds Hold down the home button for 10...

My iMac has the same issue with LCD. I found LCD itself was defective (idtech m201z2 ).

Hi, I have the same issue with my Macbook A1226. Did you fix it ? Thanks

Did you fix your iMac? I'd like to know if it was the power supply or the logic board . . . . TommyJames337, 8 hours ago Yes, I did. Power supply was defective in my case.

Hi, did you check a power from Power Supply to LCD?

Hi, I had PSU problem with my Imac. I bought a NEW Apple PSU from ebay for 79$. in my opinion, don't spent a lot of time to find a schematics to math connectors. Hi risk to fried you logic board.

Power Supply 250W iMac 24" Mid 2007 Liteon PA-3241-02A Item condition: For parts or not working

My chep is 80$ CAN, yes this for my IMac a 1225

did you fix it? my imac have the same problem Update: JUST FOUND ONE DIODE IN POWER SUPPLY UNIT BURNT OUT... NOW LOOKING FOR NEW POWER UNIT

Is it possible to install energy star board 661-4483 with additional Battery connector ? Thanks