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Troubleshooting Phone Problems
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The TechKnow Space Repair Centre
 Our Passion: Repairing Mobile Devices 
 Our Obsession:  Making Customers Happy 

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Phone Problems - Underlying and Related Damage

When an electronic device is damaged such as when dropped, there's usually a primary or visible physical effect, like a dent or broken glass. Typically we can identify (or you can even guess) the component that is damaged and replace it to fix the problem.

Fixing the obvious primary problem may not necessarily be  the only issue. Other components within the device could also have been damaged. This can only be discovered and identified upon complting a diagnostics by running an exhaustive set of tests that exercise all the functions and features of the device to uncover any secondary / additional issues and problems. This enables us to provide you with a complete assessment of your device condition and estimated time and cost to repair. The outcome of our efforts is thus a complete solution, not merely a repair of the visible problem.

Importantly, these secondary problems sometimes cannot be identified or uncovered unless the primary problems have been addressed.

For example:

A phone with a damaged touch screen can be fixed by replacing the screen. The device may however, have also suffered damage to the earpiece. This would only be discovered after the screen is replaced and additional testing is possible. Thus, in this example, the solution requires two components to be replaced.

 

Display & Touch

 

Screen damage is probably the most common reason phones are brought in for repair. 

Sometimes the event that precipitated the glass to break (or maybe the glass didn't break but the screen is black) caused unseen damage beyond the screen assembly itself affecting other functions or preventing a new screen from working.  In such cases the unseen damage will need to be repaired before a new screen replacement will revive your device.

Troubleshooting Phone Screen Problems
Problem Typical Repair Solution Additional Potential
Solution
No touch response
The screen does not activate when you swipe or tap
Screen Replacement Proximity Sensor Replacement Logic Board Repair
No backlight on display
The image on the screen is very dark - almost impossible to see
Lines on screen image
Vertical or horizontal bars across the display
Black screen
no image on display but phone can be felt to be working
Proximity Sensor Replacement

 

The proximity sensor is usually only damaged as a result of screen breakage due to its being directly behind the glass. 

Troubleshooting phone Proximity Sensor Problems
Problem Typical Repair Solution Additional Potential Solution 1 Additional Potential
Solution 2
Proximity sensor doesn't activate
(screen stays on while holding phone to your ear)
Proximity Sensor Replacement Logic Board Repair
Proximity sensor stays active
(display won't turn on and the screen is cracked)
Screen Replacement Proximity Sensor Replacement Logic Board Repair

 

More display and touch screen related problems:

Screen is freezing or getting stuck

  • Touchscreen digitizer is damaged
  • Software corruption
  • Logic board damage

 

Boot & Operational Problems

Troubleshooting Phone Boot Up Problems
Problem Typical Repair Solution Additional Potential
Solution
Additional Potential
Solution
Stuck in boot loop Battery Replacement

Logic Board Repair

Charging Circuit Repair

Corrupt OS
Won't boot past logo
Phone gets hot
Phone overheats
Displays overheating message
Charging Port Repair

Logic Board Repair

 

Troubleshooting Slow Phone Problems
Problem Typical Repair Solution Additional Potential
Solution
Phone is running slow Corrupt OS Repair Logic Board Repair
Lagging apps
Lagging touch response

 

Troubleshooting Phone Shuts Down Problems
Problem Typical Repair Solution Additional Potential Solution 1
Phone shuts off randomly Software Corruption Logic Board Repair
Phone shuts down when launching apps

  

Troubleshooting Phone Application Problems
Problem Typical Repair Solution Additional Potential Solution 1
Messages aren't working Software Corruption Logic Board Repair
Can't send Text/SMS or MMS messages

Locations services not working
can't use navigation

Logic Board Repair Software Problem

 

Troubleshooting Phone OS Problems
Problem Typical Repair Solution Additional Potential Solution 1
iOS or Android won't update Software Corruption Logic Board Repair

Not Charging Properly

You plug in your device to charge - no beep, no charging indicator - you think: "oh no I need the charging port replaced".  

Often it is that simple, however the charging port is related to other functions and components like the battery and mainboard charging circuits.

We look at all possible scenarios when diagnosing a faulty port and provide the solution(s) that solve your charging problems!

Troubleshooting Phone Charging Problems
Problem Typical Repair Solution Additional Potential
Solution
Additional Potential
Solution 2
Charging Port Loose Port Replacement Housing Replacement
Not charging at all Logic Board Repair Battery Replacement
Charges very slowly

Battery Problems

Battery problems come in different flavours.

Often it is easy to know when your battery needs replacing - most devices will give you a message leading up to it.  

When replacing the battery isn't a solution or only partially improves the functionality - we will need to to look deeper.

Troubleshooting Phone Battery Problems
Problem Typical Repair Solution Additional Potential
Solution
Additional Potential
Solution 2
Not taking a charge
Indicates a charger connection but never goes to up and doesn't turn on
Charging Port Replacement Logic Board Repair Battery Replacement

Drains fast

Phone battery doesn't last very long
For example goes from 90% to 40% in an hour

Battery Replacement
Phone shuts off randomly
or when launches certain apps and playing videos
Phone running slow
Lagging touch response, choppy transitions

Power Button Doesn`t Work

Power button issues may make it difficult - or even impossible - to turn your phone one or off. 

A stuck power button may make your phone appear to be stuck in a boot loop.

Troubleshooting Phone Power Button Problems
Problem Typical Repair Solution Additional Potential
Solution
Power button doesn't work
Moves but doesn't turn phone on or off
Power Button Replacement Logic Board Repair
Requires too much force to activate Housing Replacement
Button is jammed
Either won't push in or stuck in

Camera Failures

Most phones come with at least 2 cameras (front camera for selfies or video calls and back camera for hi-res photos and videos).

Different camera problems may have different causes and/or solutions.  

Troubleshooting Phone Camera Problems
Problem Typical Repair Solution Additional Potential
Solution
Additional Potential
Solution 2
Camera not working / Camera app crashes Camera Replacement Logic Board Repair
Blurry image / photos Lens Replacement
Camera won't focus
Lines in image / photos
Dark Spots
Spots show up on screen and in photos

Sound Problems

Sound Problems - Earpiece Symptoms

Earpiece issues interfere with your ability to hear the other party when on a call - unless you switch to speakerphone.

Often a straightforward replacement of the earpiece speaker will solve this problem. 

Sometimes (and depending on the nature of the damage be in water or impact or ...) the problem could run deeper.

We have even seen (though rarely) software to be the culprit of earpiece problems - especially in the absence of an apparent damage. 

Troubleshooting Phone Earpiece Problems
Problem Typical Repair Solution Additional Potential
Solution
Additional Potential
Solution 2
Additional Potential
Solution 3
No sound Earpiece Replacement Logic Board Repair Cable Replacement
Distorted sound or static Software / Firmware Restore
Low volume Earpiece and grill cleaning

Sound Problems - Headphone Jack Symptoms

Headphone jack problems are usually easy to identify and are rarely caused by deeper issues.  However for those few cases where it is not the jack itself here are the possibilities:

Troubleshooting iPhone Headphone Jack Problems
Problem Typical Repair Solution Additional Potential
Solution
Jack is Loose Jack Replacement Housing Replacement
Sound only on one side Logic Board Repair
Crackling sound from heaphones
Muffled or distorted sound

Sound Problems - Loudspeaker Symptoms

Loudspeaker problems are generally part-focused - meaning the problem usually lies in the speaker itself. In rare instances there may be an underlying or secondary issue.

Troubleshooting iPhone Loudspeaker Problems
Problem Typical Repair Solution Additional Potential
Solution
Additional Potential
Solution
Additional Potential
Solution 2
Additional Potential
Solution 3
Phone doesn't ring Loudspeaker Replacement Volume Button Repair Logic Board Repair Cable Replacement Software / Firmware Restore
No sound on speakerphone
No notifications sounds
Low music volume Grill & speaker cleaning

Sound Problems - Microphone Symptoms

"Hello?" ... "hello?" ... when you're calling party can't hear you your microphone may have a problem.  The mic on a phone may be integrated into the logic board or may be a component itself.

Troubleshooting iPhone Microphone Problems
Problem Typical Repair Solution Additional Potential
Solution
Additional Potential
Solution 2
Doesnt record sound Microphone Replacement Logic Board Repair
Recorded sound volume low Grill & mic cleaning Microphone Replacement
 

Signal Problems

Signal Problems - WiFi Symptoms

WiFi problems? Don't run up your data bill - get your WiFi connection fixed ASAP!

Troubleshooting Phone WiFi Connection Problems
Problem Typical Repair Solution Additional Potential
Solution
WiFi will not turn on Logic Board Repair
Can't connect to WiFi WiFi Antenna Replacement Logic Board Repair
Can't find any networks
Loses WiFi Signal
Weak WiFi signal

Signal Problems - Bluetooth Symptoms

Bluetooth is vitally important to many people these days - to onnect to your earphones, wireless speakers and your car.

Troubleshooting iPhone Bluetooth Connection Problems
Problem Typical Repair Solution Additional Potential
Solution
Bluetooth will not turn on Logic Board Repair
Can't find any devices Bluetooth Antenna Replacement Logic Board Repair
Weak Bluetooth signal

Signal Problems - Cellular Symptoms

Hit and miss communications - "can you hear me now?" - a damaged cellular antenna will be sure to keep you mostly offline.

Troubleshooting iPhone Cellular Antenna Problems
Problem Typical Repair Solution Additional Potential
Solution
No cell signal Cellular Antenna Replacement Logic Board Repair
Weak signal / drops calls

Signal Problems - SIM Card Symptoms

With a SIM tray problem your phone isn't much use as a PHONE surprised!  You won't be able to make or receive calls and text messages and data won't work.

Troubleshooting iPhone SIM Card Problems
Problem Typical Repair Solution Additional Potential
Solution
Not detecting SIM card SIM Reader Replacement Logic Board Repair
No signal message
Broken Pins in SIM slot
SIM card stuck in slot
 

Button Problems

Button Problems - Home Button Symptoms

On models that have it - possibly the the single most important control!

Troubleshooting Phone Home Button Problems
Problem Typical Repair Solution Additional Potential
Solution 1
Additional Potential
Solution 2
Home Button doesn't click doesn't work Home Button Replacement Logic Board Repair Home Button Cable Replacement
Requires extra force to activate
Touch / Fingerprint ID stopped working
Phone won't read my fingerprint
Hard Reset Software Restore Take it To Manufacturer

Button Problems - Volume Control Symptoms

You've gotta be able to crank it up - (or turn it down) -- volume control frustration relief is a 1 hour visit to TechKnow Space!

Troubleshooting iPhone Volume Button Problems
Problem Typical Repair Solution Additional Potential
Solution 1
1 Volume button doesn't work at all Volume Button Replacement Logic Board Repair
Volume button(s) stuck Housing Replacement
Both volume buttons don't work Logic Board Repair

Button Problems - Mute Switch Symptoms

Instant silence at the flip of a switch. Your mute button immediately silences the ringer giving you privacy when you need it.

Troubleshooting iPhone Mute Button Problems
Problem Typical Repair Solution Additional Potential
Solution 1
Button does not mute sound Mute Button Replacement Logic Board Repair
Button moves but phone stays muted
Button is stuck (physically won't switch) Housing Replacement
 

TechKnow Space Toronto Ontario: 416 987 9860TechKnow Space Mississauga Ontario: 905 897 9860

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