Iphone 3gs backlight turns on then off

Dec 22, Dec 31, 4: Jan 5, 4: Jan 26, 6: Feb 25, 5: Backlight turns on and off randomly More Less. Communities Contact Support. Sign in. Browse Search.

How to Keep Your iPhone's Screen from Randomly Turning On « iOS & iPhone :: Gadget Hacks

Ask a question. User profile for user: Backlight turns on and off randomly Hi, I have an extremely annoying issue with my original 13" MacBook.


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  • iPhone Backlight Repair - The Ugly Truth — navigate.

Basically, at random times the backlight shuts offs as if the computer is going to sleep. Sometimes, it can be fixed temporary by shutting the lid and opening it again, as if the computer is waking up from sleep. There seems to be no obvious way to reproduce this problem — sometimes I go for an hour or more without it, sometimes it happens ever 10 seconds and the computer is unusable.

Any ideas to fix this would be greatly appreciated. More Less. All replies Drop Down menu. Loading page content. The MLB main logic board and integrated graphics may be going bad. Or your backlight may be going out. Does this happen when you tilt the screen back and forth?

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Any vertical or horizontal lines appearing at any time? Reply Helpful Thread reply - more options Link to this Post. Tried all sort of resetting and looking at my power options but nothing out of the ordinary. I don't get any horizontal lines, or distortion when moving the display and it goes off at random times and can only be relit by coming out of sleep.

One thing in particular that was quite weird about it I have the screen connected to an external monitor most of the time because of this issue in clamshell mode. I unplugged the external and the internal screen momentarily came on and then went to turning off. I hope someone understood that. I'm now at the last resort of reinstalling the OS - but don't really want the hassle of doing that in case anyone else has any ideas.

I tried replacing the inverter but the problem is still there. I think the inverter I brought off eBay might be 2nd hand Still yet to find out exactly when it is happening It can stay on for hours and then turn off and on multiple times in a short time. I normally keep it on the 2nd to lowest brightness setting, and when the screen goes off, I just turn the brightness all the way down and back up again and it comes back on.

Sometimes when putting the brightness back up it immediately goes off then on again. I don't see flickering at any other times though, it just immediately goes off so I don't think its a bulb problem. Pressing on the chassis around where the connectors are doesn't cut anything out and neither does moving the laptop or screen. I've also ran apple hardware tests and tech tool hardware scans both finding no problems.

Fixing a backlight problem in an iPhone 3GS

Not that I know they can test for inverter or bulb problems I've done a fresh reformat as-well not from a time machine backup to no avail! Is it possible it could be power related because my battery is in the 'replace now' stage? But the problem happens on power as-well. Have you found any solutions?

My iPhone boots to the Apple logo and then turns itself off.

Did you try replacing the inverter board again? Backlight is fidgety at best. Ive re-installed the OS The, only difference between pre OS reinstall and post OS reinstall is now the backlight will go off if the screen is moved from a certain position. Does anyone have an update and also a credible link for a diy inverter install? When waking the computer from sleep the backlight goes on and immediately off the screen itself stays on.

So I did more digging before purchasing the repair equipment. I finally made contact with an iPhone repair service shop in Springfield, Missouri that mentioned repairing iPhone 3GS coils on their website.

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After the discussion that ensued, all of my suspicions were confirmed. The reason was that most iPhone replacement coils burn out within a few days of installation.

The reason this does not work is because it isn't the coil that is malfunctioning. A short circuit on the board causes a surge to the coil that burns it out. So if you replace the coil and you don't fix the short on the circuit board, the new coil will eventually if not immediately burn out. It's sad that there are so many scam artists on eBay and Amazon collecting the money of unsuspecting hard working individuals who think they can install replacement coils and IC chips. But until enough people get writing and reporting about this issue, it will probably persist. There's really only a couple of ways that you can safely remedy the dim screen of an iPhone without completely risking losing all of your investment.

That's either replacing and installing a brand-new circuit board, or installing a used board from a broken iPhone. The sad news is that the integrated circuit board inside an iPhone isn't cheap. It's the most expensive component inside the phone. Everything that makes the iPhone an iPhone is on the circuit board.

Elsewise, you can take your chances on buying a broken iPhone 4 and plucking out the logic board, but broken iPhones with good backlight coils will cost as much as the logic board alone. But beware of what you buy.

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Upon first glance, it looks like you're getting a steal-of-a-deal buy, until you realize that there are no chips on the board whatsoever. I have no idea. Even if you were gutsy enough to attempt installing all of the components onto a bare iPhone circuit board, you'd have to get special soldering stencils for all the chips, and have some serious IC soldering skills to pull it off.

Here comes the hard truth If you're thinking about buying an iPhone for the first time, here's what you need to understand! That little device has more technology packed into it than what most super computers could boast just 10 years ago. Why Apple creates such a fantastic but fragile device that has to be put in big blocky brick-like case to prevent shattering the screen is byeond me. But buyer beware, you better protect your investment or you'll be crying all the way to the bank when you drop it from the slightest height to a hard surface.

When you drop that precious piece of equipment down to a hard surface and you shatter the screen, there's a good chance that you damaged your logic board. If you're lucky, the logic board survived without any internal damage. But there's a chance that the micro-sized wires, connectors, and soldering on the circuit board could be cracked or pulled apart or short-circuited due to the shock of the drop. The only thing keeping the phone working is the fact that it hasn't been disassembled. When you take that poor broken iPhone apart, the force the tightly packed components in the case may no longer keep a broken circuit wire or connector touching and conducting electricity across the crack.

Once you get the phone put back together, you could have the ugly surprise of a non-functional smartphone or certain components not working correctly. So your iPhone screen is completely dim, and you need a new backlight coil? Well forget fixing it. It's fouled up beyond all repair. Either replace the logic board, or throw the thing in the nearest trash receptacle. Think again There's practically zero demand for used iPhones with burned out backlight coils, because salvagers know better than to try to make use out of a damaged IC board inside of an iPhone.

If you own an iPhone, you better not ever think about risking dropping it in water or getting it wet. If you're in the market for a new iPhone, you need to realize that the cost of owning one of these devices is not the purchase price that comes with a 2-year contract agreement. There are a few other things you better consider that factor into your overall cost.

They are as follows:. If you have taken these things into consideration, you might be ready to own an iPhone. But now you know the ugly truth about what happens when you break or water damage an iPhone without insurance. Be educated and empowered! I'd love to hear about it! Also, please share your repair tips if you are a seasoned veteran.

We'll see you in the comments section! CZ Blog.