crwdns2934065:0crwdne2934065:0: 1,5crwdns2936485:0crwdne2936485:0
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Got an iphone 4 that was dropped in a bucket of icemelt/water, cleaned it up, no backlight. Took a known good logic board and put it in, the screen is fine. A few hours of google left me with nothing, is the backlight coil still the 6R8, and where the heck is it? Does anyone know, or have any experience with replacing it? Thanks
crwdns2934109:0crwdne2934109:0
crwdns2934065:0crwdne2934065:0: 91
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Iphone 4 has a different coil http://fonefixer.webs.com/apps/webstore/...
This little monster is what you need.
crwdns2934105:0crwdne2934105:0
you sir are the man. back in January I couldn't find this, I'll keep that link and order a couple for the future. Thanks!!!!
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By coil, do you mean a part of the driver for a CCFL backlight? The iPhone 4 actually has an LED backlight for its retina display; the individual LEDs can be seen on the third picture of this step on our teardown. It looks to me like the little two-lead ribbon cable that is soldered near the display data cable connector is the backlight cable. You might want to pull off that little piece of tape covering the solder points and test the LED array for continuity.
crwdns2934105:0crwdne2934105:0
i took the logic board out of a known good iphone and put it in the iphone with a bad backlight, the screen lit up fine, so its something on the logic board itself. i am thinking about de-soldering the metal frame on the top left portion (just under the rear facing camera) that doesnt come off like the other 4 metal covers because you cant see whats under it, and i have a feeling this is where my problem lies. The iphone 3g and 3gs actually has a small coil that powers the LEDs, I was wondering if the iphone 4 was the same [image|83689]
crwdns2934065:0crwdne2934065:0: 1
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When the iphone 4's get wet there are a coiuple things that usually go bad.
1. is the backlight ic
2. is the coil right next to it.
and for the coil I have been using the coil for the Iphone 3gs with great success, and i sell it also.
My user name is on my profile page
[URL=http://imageshack.us/photo/my-images/137...][IMG]http://img137.imageshack.us/img137/6196/...[/IMG][/URL]
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crwdns2934105:0crwdne2934105:0
thanks for giving your images of the problem, I've edited your answer because it contained your contact details etc. It's fine to list them on your profile, but if they are part of the answer you'll have it deleted as spam. It'd be nice if you could answer more iphone questions..having someone who knows their onions (or iphones) would be really fab. Welcome to ifixit!
Hi tinner, welcome to the site. As pollytintop stated, please do not advertise your services in Answers, that's not the place for them. Also, you can use our simple image uploader (there's a tab at the bottom of the page) to post pictures in your Answers.
crwdns2934065:0crwdne2934065:0: 1crwdns2936485:0crwdne2936485:0
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The first thing any of you should do before changing the Driver IC and the coil is check the capacitors around the LCD connector. If any of these are shorted or grounding then you need to remove them one by one until the short disappears.
Only if the Caps are not shorted should you start along the driver IC route as it's tricky work and you'll need decent tools and skills.
Remeber to cover the POwer IC with silver foil before you start blasting around with a hot air gun! Best option is Infrared.
crwdns2934105:0crwdne2934105:0
Dave. I might got a job for you if you got experience with this thing.
Could you contact me? mponjee@hotmail.com.
Cheers.
sure, I'll mail you later
crwdns2934065:0crwdne2934065:0: 97
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You can get the iphone 4G and 4GS backlight Coil and backlight IC chip from here
repair video update
okay this is a soldering repair video on iphone 4S backlight coil
but the process is the same on iphone 4 just the coil location is different, and different inductance for the coil, same shape tho. the whole soldering process is the same
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or if it even has a coil, im assuming here
crwdns2934271:0crwdnd2934271:0 crevz crwdne2934271:0
No, I gave the phone back as is, I think he may have just returned it under warranty. As far as the website, i dont know why its password protected now, but Ive seen the parts all over the web, including ebay. it looks like a rectangular chip with 6 prongs, and its located mid board near the top if i can remember correctly.
crwdns2934271:0crwdnd2934271:0 crevz crwdne2934271:0
Question Crevz, were you able to resolve your backlight issue with the iPhone 4?
Also, I've tried accessing the fonefixer website but it requires a login and doesn't provide a sign-up page.
crwdns2934271:0crwdnd2934271:0 Jarod crwdne2934271:0