This time we will try to fight against planned malfunctions, by bringing back to life our favourite LCD.
Step 1: LCD tango down
Placing heat-sensitive electrolyte capacitor near elements which are emitting a LOT OF energy by heat is one of the most common method to reduce life time of product. This causes faster loose of capacitance and, in effect, failure of element. And this, exactly, happens to me.
Step 2: Disassembling LCD
Use your engineer sixth sense to dismantle EMC shields.
When You get to cables, make photo of all connectors, it will be big help in assembling. When photos are done, You can disconnect all connectors.
When cables were disconnected, i could take out box with PCBs. Locating power supply is easy: look for the board with soldered power socket.
Step 3: Looking for broken elements
- convex on the side,
- convex on the top,
- woobling of capacitor,
- something crumbly under the capacitor,
- some kind of powder on the top.
As You can see in the image, two of my capacitors were broken – strange powder on convexed top. Mark the polarisation.
You have to desolder all bad capacitors from PCB.
Step 4: Soldering
The new ones should have same or bigger operating voltage, same or bigger capacitance and should be designed to work properly 105 degree Celsius and should be "LOW E.S.R.". This parameter means that capacitor will work well longer than older ones. Solder capacitors to the board.
Connect power cable, turn power on. If there wasn't any fireworks, try to connect it to the graphic card.
Step 5: System is defeated
Now take your brand new iPhone, look at it. Ask yourself a question "do i really need it?". And remember the definition of Planned Obsolescence... ;)