LCD LED TV Faults which can be repaired by laser machine

March 3, 2019

LCD LED TV Faults which can be repaired by laser machine

The most frequently asked question is what are the faults which can be repaired by a laser machine?

The principle of laser machine is for LCD LED screen inside circuit repairing, that means almost all faults which caused by screen inside circuit are can repaired by a laser machine. And laser machine also can repair some COF/TAB faults (instead of bonding machine).

Laser LCD Repair Machine Introduction
LCD glass simple structure
Each pixel is composited with RGB 3 original colors. Each color brightness is controlled by one COF line
Principle of laser machine
The principle of laser machine repairing is using the power of laser to change the circuit connection in glass.
Have two functions:
1. Break a wire
2. Connect two wires
Break a wire
Connect two wires
In glass, usually have some spare wires for repairing.
In normal condition, there is a insulating layer between main wire and spare wire, main wire and spare wire is not connected.
If apply a proper laser pulse to the cross, can break the insulating layer, and the main wire and spare wire will be connected.
Case 1: Repairing a open circuit
Solution: Connect to the same color wire
Case 1: Repair a open circuit
Step 1: Cut spare wire
Case 1: Repair a open circuit
Step 2: Connect main wire and spare wire
Now line 1 is connected to line 2, line will display same as line 2.
Though line 1 display is a little different from the original image, but can not be distinguished by eye.
Case 2: Repair a short circuit
Short circuit between two wires, just cut it with the laser.
Case 3: Repair a pixel
For a broken pixel, just cut the power supply of this pixel, then the the pixel will become dark, and can not be saw by eye.
Case 4: Case share
User laser machine to repair a vertical line on LCD LED screen
Case 5: COF problem repaired by laser machine
When come with a COF wire broken problem:
1. Change a new COF
2. Repair as Case 1
Method 1 advantage:
Perfect display after repairing
Method 2 advantage:
a. Fast repairing
b. No need consumable material, low cost.

How to Repair a LCD TV with Colored Vertical and Horizontal Lines By a Laser Machine

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