What is the BGA repair table

November 25, 2022

Do you know what a BGA repair table is?

What is the use method of BGA repair table? This let Da Tai Feng Xiaobian for you to introduce in detail:

The BGA repair platform is divided into optical and non-optical alignment, and the optical alignment is imitated through the optical module using a cracked prism. Non-optical alignment is to align the BGA according to the silk screen lines and points of the PCB board by the naked eye to achieve alignment repair.

BGA repair table is a reheating and welding equipment corresponding to the poorly welded BGA. It can not repair the quality problems of the BGA components themselves. However, according to the current technology level, the probability of BGA components factory problems is very low. If there is any problem, the welding defects caused by temperature will only occur at the SMT process end and back section, such as air welding, false welding, false welding, soldering and other welding problems. But many individuals repair laptops, mobile phones, XBOX, desktop motherboards, etc., will also use it.

The use of BGA repair table can be roughly divided into three steps: diswelding, mounting, welding. All changes remain the same.

1. Preparation for repair: Determine the air nozzle suction nozzle for the BGA chip to be repaired. The temperature of the repair shall be determined according to the welding with and without lead used by the customer. The melting point of the lead tin ball is generally 183℃ and that of the unleaded tin ball is generally about 217℃. Like the universe, fix the PCB motherboard on the BGA repair platform, with the laser red dot positioned in the center of the BGA chip. Shake down the mounting head to determine the mounting height.

2. Set the diswelding temperature and store it so that it can be called directly when repairing in the future. In general, the temperature of dissoldering and welding can be set to the same set.

3. Switch to the disassembly mode on the touch screen interface, click the repair key, and the heating head will automatically come down to heat the BGA chip.

4. Five seconds before the temperature is finished, the machine will give an alarm and make a drip sound. After the temperature curve is complete, the nozzle will automatically suck up the BGA chip, and then the mounting head will suck up the BGA and rise to the initial position. The operator can connect the material box with BGA chip. The diswelding is complete.

Mount welding.

1. After the tin removal on the pad is completed, use the new BGA chip or the BGA chip after the planting ball. Fixed PCB motherboard. Place the BGA to be welded approximately in the position of the pad.

2. Switch to mounting mode and click the Start button. The mounting head will move down and the suction nozzle will automatically suck up the BGA chip to the initial position.

3. Open the optical alignment lens, adjust the micrometer, adjust the front and back of PCB board on the X axis and Y axis, and adjust the Angle of BGA from the R Angle. The tin ball (blue) on the BGA and the solder joint (yellow) on the pad can be displayed in different colors on the display. After adjusting the tin ball and solder joint completely coincide, click the "Match Finish" button on the touch screen.

The mounting head will automatically drop, put the BGA on the pad, automatically close the vacuum, and then the mouth suction will automatically rise 2~3mm, and then heating. When the temperature curve is complete, the heating head will automatically rise to the initial position. The welding is complete.

Add welding

This function is for some BGA which is caused by poor welding due to low temperature before, and can be reheated here.

1. Fix the PCB board on the repair platform, and locate the laser red dot in the center of the BGA chip.

2. Call the temperature, switch to welding mode, click Start, then the heating head will automatically drop, after contact with the BGA chip, it will automatically rise 2~3mm to stop, and then heating.

After the temperature curve is completed, the heating head will automatically rise to the initial position. Completion of welding

In terms of the whole structure, all BGA repair stations are basically the same. Each type of optical BGA repair station has its own advantages and characteristics. So the above is about what is the BGA repair table and the use of BGA repair table introduced, have you learned?


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