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The BlackBerry Bold 9900 is a smartphone with full QWERTY keyboard and touchscreen.

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teach me how to fix the '' not turning on '' problem


My name’s Kyle, I’m 11.

I need to fix this problem on my blackberry bold 9930 (aka 9900 ) that my neighbor gave me. it won’t turn on after I replaced the battery, no red light, no signal on the screen. before without the battery it just had this red light thingy.

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Do you have a multimeter? Also just keep in mind that this phone won't be able to make calls or texts since 3G is being shut down.


i don't have a multimeter. And the phone won't be able to make calls or texts but it uses 4G



If you wish to fix electronic devices at component level a multimeter is a fundamental requirement.

Adequate ones are available at larger hardware stores. If you consider getting one then I suggest that you get one with a user manual (or a downloadable user manual) and read it to learn how to use the meter properly.

Without a meter it is only guess work and even having the schematics won't help you.


ok jayeff, i can borrow that from my neighboor then. And i remembered when i place some acetone is the last time i saw it working. Did i put too muco on cleaning .... 😨



Acetone can damage electronics if you use it too often or even the one time if used too much.

Ideally you should use Isopropyl Alcohol 99%+ (available for electronics parts stores) as this does not harm electronics when wet and also leaves no residues when it has evaporated.

if you can't get IPA 99%+ then use distilled water to clean away any corrosion etc

Always disconnect the power from a device i.e. battery, when using any liquid cleaning agent as all liquids, even IPA 99%+ conduct electricity to some degree. The liquid can create circuit paths between components that maybe should not be connected electrically with each other and can damage them.

Distilled water is the only liquid that doesn't conduct but it is always safer to simply disconnect the power first.


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Don't spend too much time on this phone - it's a bum device. The 3G shutdown means it won't get cellular service, and RIM has announced the legacy BlackBerries (non-Android, so PRIV is fine; the others are done) will no longer work reliably. They shut down the back end servers so the phones will lose just about all of their functionality.

The reason this issue is so fatal for this BlackBerry is it was from a time when the carriers demanded the OEM handle services like eMail and internet and had an iron grip on how custom the phone was (yep, even down to if it was carrier hard locked, which Sprint and Verizon were infamous for in the US, or let us unlock the GSM half for "international use" but hard locked the phones in the US). They had to do this back then not only because of the carriers, but also corporate customers who demanded it (the gov't users ABSOLUTELY demanded it, no questions). Fun fact: this is why a lot of them have no cameras, or an IT policy to block it.

The consequence of all of this means these phones are also known to have residual IT policies which didn't get removed (anyone know about buying a used iPhone with an iCloud lock? Deja-vu huh?). Granted, removal is easy (BDM or 3rd party tools as it was locally stored) but it doesn't make sense today.
Nowadays the carriers stay hands off on services beyond cellular service -- to the point they dump the support problems on the OEM of the device, even if they sold it in the first place!

Nowadays, buying a carrier locked phone isn't worth it since you get the same device with branding and bloatware, as well as a permanently locked bootloader* unless it's super cheap secondhand and easier unlocked, like some used prepaid phones. Since it's the same price outright or financed, you're usually better off buying the devices outright, owning it and taking it to the carrier. The landscape today is nothing like the days when these were still supported, and carriers also did effective troubleshooting (because they had to).
*The Samsung U1 (factory unlocked) SKU retains the bootloader issue, since Samsung ships the same phone to carriers, outside of a subsidy lock and selling it as a "1U" device and carrier specific ROM.

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well its rare in Vietnam, where I'm living and they buy a whopping 10,000 vnd for it


@ifixitisthebest That makes sense now. I'm from the US, so BlackBerries are eWaste you buy by the bulk device lot.


huh... old phones are allways e waste in usa .


@ifixitisthebest Basically, yeah. Once they hit a certain age, we're done with them due to repair cost (like Samsung) or age (I have a cracked S6 Edge+ I hacked together with a phone with a good cracked screen/bum board and a bad screen/good board), if it's not both. I retired it due to the cost to *properly* sort it out since my eBay battery failed and the used OEM pull was manhandled, and how bad the condition is due to the age of the device.

It's insane I agree, but imagine the phone is worth ~$50-75 in a normal market, and a nice screen is easily $100+ -- I'll buy a secondhand 5G phone like a Moto One 5G Ace or an A42 5G!


What a waste of money if you buy a new phone to use and it ends up old and ends up in e-waste right?


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Kyle at work será eternamente grato(a).
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