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.






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 SIM unlockable or hard locked like VZW and Sprint BlackBerries or the infamous BS "international" unlock with hard-locked US radio). They had to do this back then not only because of the carriers but also corporate customers who demanded it (the US gov't ABSOLUTELY demanded it; no questions). Fun fact: this is why a lot of them have no cameras or an IT policy blocking them.

The consequence of all of this means these phones are also known to have residual IT policies which didn't get removed (anyone knows what you get with an iCloud-locked iPhone? De-Ja-Vu huh?). Granted, BB removal was/is easy (BDM or 3rd party tools as it was locally stored and could be wiped out) but it doesn't make sense today. Doesn't work now, KNOX, Apple MDM and Google's MDM is cloud based and follow the S/N). The way carriers operate now is one of 3 modes:

  • Big 3 (AT&T/T-Mo/VZW): Customize the phone, SIM lock (60 days or until paid off) and sell in retail
  • ISP MVNOs: Buy "retail" SKUs (or "blank" SKUs), SIM lock, MAYBE brand since it isn't a main business item for them; it's customer retention.
  • Standalone NVMOs: Mixed; some sell the phone "locked", others sell them unlocked. Mint sells unlocked, but not all of them do; it varies. Branding varies; some mark the phone, others do not.

Nowadays the carriers stay hands-off on the phone to a large degree beyond altering it with their garbage and SIM lock (and specific ROM) to the point they just discard the problem of support on the OEM; often without doing their job. Carrier-locked phones are no longer worth it today; you lose things like unlockable bootloaders for good* in some cases (like VZW) while others let you unlock it after SIM unlocking on Pixels or re-enable it in the dev menu on a few phones from Moto; but the general rule is it's locked forever unless you get a Pixel or lucky Motorola unless you're cursed by Verizon, even OnePlus follows the two-tier rule: VZW permanent, all others released when unlocked. The only exception I see NOW is trade-in deals where the carrier will take absolute garbage that came from the son's junk bin who breaks them/tinkers with junk they do not care for to get bill credits or unlocking a supported but carrier-locked phone at a deep discount (IF you can; they love to block the attempt with a balance; again, see the comment about tying balance to credits. By the time it can be done (2.5-3 years), I'm done with it as a main phone; it's a drawer toy or trade-in garbage if it's too beaten up). You pay the same price as you do unlocked too now, with all of the carrier phone downsides too unless it's being "paid" by bill credits (which they intentionally tie to paying the phone off so you can't pay it off early and make the phone unlock ready WHILE getting bill credits, fun fact number 2; AT&T pioneered this financial trap). Why not get the phone factory unlocked in retail, and either swap your SIM over or have the carrier make you a new SIM if you need it, especially when "support" is looking for an outage (or lie) and send it to the manufacturer either by force or referring the user? Back in the days of the 2-year contract, THEY handled warranty and carriers had service centers as THEY warranted the phone, not Samsung/Google/Apple/etc.
*The Samsung U1 (factory unlocked) SKU retains the bootloader issue since Samsung ships the same phone to carriers, outside of the garbage and subsidy lock as a "U1" phone in the US; or U/1U for carrier custom versions.

So yeah, it's a shelf piece.


得分 2


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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