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COF (Chip-On-Film) Technology for LCD Driver

Basically, a COF bonding can manage or supervise the operation of bonding machines, which employ adhesives to unite things in preparation for additional processing or to make a finished product. For example, glueing veneer sheets into plywood, glueing paper, or combining rubber and rubberized fabric pieces, plastic, simulated leather, or other materials are all examples of jointing processes.
Centers that give various categories of training and learning, such as software, hardware, web development and networking, may be found almost wherever you look. In addition to this one may learn about the fundamentals of security, maintenance, and troubleshooting processes, among other things. In order to make an informed decision when choosing a center, you must understand the possibilities and how it might help you in the long term. The high dependability comprises aging and peeled tests that were conducted to evaluate the product experience of the COF and NCA process in conjunction with one another.
If you are a newcomer in this field, the first criterion you must consider is finding reputable COF bonding training despite the fact that you will come across numerous centers you must finalize and pick the most appropriate one based on factors such as location, class size, training facilities, accreditation and its courses, as well as fees and other costs. There are also certain facilities that provide special discounts on specific programs, which might be a very attractive incentive to enroll in one of them.
Why COF bonding is important?
In the chemical world, an adhesive is a substance that has the capacity to bond two or more materials together. The ability of adhesives to perform this job is related to their ability to form a surface connection that is difficult to separation. When the adhesive molecules adsorption onto a solid surface and due to its reaction with it, a connection is formed between the two surfaces. Adhesives are very important in almost every industry, both for structurally and non-structural applications. COF provides a general concept of the options for sticking materials together by bonding. COF bonding training have years of expertise in this field, which allows providing the most comprehensive range of LED/LCD Tab Bonding Machine Repairing Services available anywhere. These are completed in accordance with the specifications of the client. The low pricing, flawless mending, and client-focused approach of the offered welding machine repairing services have earned them widespread recognition.
The Training Courses are designed to educate individuals with an in-depth and comprehensive understanding of chip, glueing process and their components, as well as the complicated science behind their functioning, connection, and networking. Through the training, you will get an understanding of the variable roles that each component and piece of technology performs in the overall operation of the system.
This is most likely due to a combination of factors such as decreasing costs, increased demand for lightweight constructions, the development of more lasting adhesives, and enhanced structural adhesive effectiveness. Furthermore, adhesives are often more effective in transferring load than welded constructions.
Automatic COF bonding machines that have been built just for you are implemented according to your requirements. Its manual solo or multiple workstations are available in both manual and completely automation configurations for tab, LCD production. It takes varying amounts of time to heat up depending on how dense the current flow is.
Also Read: What Do You Know About The Motherboard Chipset?
Compared to the traditional tape-automated-bonding (TAB) and chip-on-glass (COG) methods of connectivity of liquid crystal modules, the COF method is more cost-effective (LCM). The film’s thickness, which is more flexible than TAB, may be as thin as 44, making it ideal for use in medical applications. It has the capacity to do pre-tests, while COG does not. It has significant promise in a wide range of product fabrication applications.
Bottom Line
As of this writing, the current COF technology not only allows for the mounting and loading of a wide range of peripheral components, but it also allows for the loading of a large number of individual chips (multi-chip technology) onto the tape. It is commonly expected that this technology would become more important in the future for simplifying the systematization of devices such as mobile phones and personal digital assistants (PDAs).
Know the Technology behind repairing LED and LCD panel

Significance of LED displays in display
When shopping for television these days, most people are searching for either an LED or an LCD model, depending on their budget. Who doesn’t want to know that the film, documentary, or video clip they’re viewing is visually appealing? In general, the greater the sound quality, the better the visual quality should be in tandem with each other. LED display technology is the most widely utilized kind of display technology in display systems. LED displays provide vivid colors as a result of the use of LED lights.
As energy supplies are depleted on a daily basis, this has become a critically essential problem. People who use extremely little energy, in particular those who deal with electricity, are in high demand. It does not only result in the purchase of the panels, but it also raises your expenditures when you use it on a constant basis, as well as your power bill.
Is it true that LED and LCD are the same things?
There are a great number of LEDs and LCDs available on the market, and each of these televisions has different features and their panels are also not the same. Its been thoroughly examined by industry professionals. However, since there are so many different led available, it is only natural for the customer to get completely puzzled. It is disheartening to learn that many of the purchasers are unaware of the differences between an LED and an LCD television set.
LCD monitors are used in all LED displays. However, not all LCD displays are made of LEDs. In the same way, as all eagles are birds, not all birds are eagles, and vice versa. While the titles may be complicated to those sifting through specifications in search of the finest monitor, once you break it down, it’s much simpler to comprehend than you would think.
The need for LED LCD panel repair training
Because of the rising economy and steady rise in spare money, the majority of people are purchasing the finest televisions available on the market, which are equipped with the most up-to-date technology. Because of the growth in demand and the need to stay ahead of the severe competition, television manufacturers study and produce television models that have the most up-to-date features for the benefit of customers. LED TV and LCD TV technologies are the most recent technologies to hit the market and are now accessible. Currently, these technologies have gained widespread popularity among the general public, thanks to their bright and spectacular colors, as well as their gorgeous acoustics and other benefits.
These days we should know that the need for LED LCD panel repair training courses is expanding at an alarming rate, and one of the primary reasons for this increase in demand is the inevitable growth in the sale of LED televisions. By taking an LED TV fixing course, one may either create their own company or, if that is not an option, make a good living in a position with a good wage package. There are many institutes that are best in offering LED LCD panel repair training for laptops, smartphones, LED LCD TVs, printers, and closed-circuit television systems. These institutes give full online assistance is provided to students via an LED LCD TV Repair Forum where learners may ask any questions, they may have without having to worry about being judged by their peers or feeling self-conscious. Course on fixing LCD, LED, and Smart TVs. They even offer an online led television repair course and learning materials, as well as a connection to the led television bios software.
Also Read: A Detail Guide on LED LCD Panel Repair for Advanced Technicians
The repair training centers are founded with the goal of producing highly skilled indigenous technological professionals to help emerging countries accelerate their economic development. They present students with a one-of-a-kind learning environment where they may discover self-improvement via on-the-job training It is important to note that the courses given by the institution are professional and skill-based in order to ensure that students can put their newfound knowledge into practice while on the job. Once you study LCD LEDs from a reputed LED LCD panel repair training institution there are chances where you will be confused as to what you have to do. But after learning ultimately you will be unable to remain jobless since the purpose of starting this course is to provide a fundamental medium for a large number of individuals to make a substantial amount of money.
COF TAB REPLACEMENT TABLE
COF | COF IC REPLACEMENT NUMBERS |
8159-CCBQ | NT39980H-C5256A 8159-ACBPU |
8656-CYOB | NT39538H-1272A |
8658-GCYOU | RM76730FA-603 |
8674-BCC96 | S6CG221-51 |
8157-ACBMX | 8157-BCBNM |
8159-CCBQ1 | 8159-ACBPU |
8157-RCY88 | NT39892H-C12H5B/NT39892H-C12H5F有灰阶线,一起换OK/RM927A1FF-61B |
8656F-C0YB | NT39538H-1272A |
8658B-CBH1 | 8651A-CBD7 |
8020-GBCGS | 8021A-CBD6 |
5253-BCBR3 | 5276-ACBR6 |
5223-FCBQU | NT39565H-C5253A |
8019-FCCA0 | S6C1162-52 |
8019-KCBCX | LH16B5D2 |
8020-A CH23C | S6C1127-51B |
8020-GCBJ4 | NT39646H-C5103A |
8031-DCBKO | NT39962H-C5107A |
8031-DCV17 | VSM21074A |
D160132RNL-092 | S6C1125-65 S6C1125-61 |
D160252NL-051 | S6C2792-52/54会短一点,如果出现线的话要一起换 |
D160407NL-056 | D160407NL-055-C1-0A |
D160253NL-051 | D160243NL-151,LS0360M1-C2LX |
D160407NL-055-C1-0A | D160407NL-056 |
D160418ANL-051 | RM92161FB-0AN |
D160418ANL-054-C1 | RM92161FB-OAN(换一半) |
D160418NL-054 | RM92165FC-0CC RM92161FB-OAN ? |
D160962NL-51 | NT39381H-C0265A NT39386H-C0265A D160975-051 |
D160962NL-051 | NT39381H-C0265A |
D160971NL-055 | NT39662H-C02D5D |
D160974ANL-051 | RM92120FA-038 RM92122FA-058 NT39921H-C02B7H |
D160975NL-051 | D160962NL-051/D160975ANL-051/RM92122FA-058/NT3993H- C02F7A/D160418ANL-054-C1/RM92165FC-0CC/D160958NL/NT39921H-C02B7H/RM92120FA-038 |
D160975ANL-051 | RM92120FA-038/D160994NL-054短接R33,R34 |
D160975NL-51 | RM92122FA-058 |
D160985NL-052(易坏) | 用NT39389H-C0255完美代换 |
D160987NL-052 | S6C2A72-52U D160987NL-055 S6C2A72-52U |
D160987NL-055 | D160987NL-052 S6C2A72-52U |
D160994NL-051 | NT39931H-C02F7A D160994NL-054 |
D160994NL-054 | D160994NL-051 NT39931H-C02F7A |
D160998NL-053 | D160998NL-054-C1 RM92150FB-095 |
D160998NL-053-C1 | RM92150FB-095 |
Remark: This table just for reference and keep update.
D160998NL-054-C1 | D160998NL-053 |
D160998NL-054-C1 | D160998NL-053 |
LS0610BT1-C2LX | MT3725VB |
LS08S6HH3-C2LX | LS08S6HHT1-C2LX |
LS08S6HT1-C2LX | MT3728VC/LS08S6HT3A-C3LX/LS/LS08S6HH3-C2LX/LS08S6HT1-C3Lx |
LS08S6HT3A-C3LX/ LS | LS08S6HT1-C2LX MT3728VC/VB LS08S6HT3A-C3LX |
ls08s6ht1–c3ls | ls08s6ht1–c2ls |
LS08S2M7-C3LX | SS8310-C1LX LS08S6HT3A-C3LX |
LS08S6HT1-C3LS | LS08S6HT3A-C3LS/LS08S6HT3-C3LS/用MT3728VC代换的时候要一起换 |
LS0896BD3-C5SX | DB7894-FL03X SS8402-C6LS完美代换 |
LS0896BD3-CBLX | LS0896BD3-C5SX |
LH16B5D2 | 8019-KCBCX |
LH16DD07 | NT39990H-C6003A |
LS0306M1-C5LX | LS0306M2-C1LX |
LS08S2M7-C3LX | SS8310-C1LX/CILAEX/LS08S6HT3A-C3LS |
LS08S6HT3A-C3LS | LS08S6HT1-C2LX/LS08S6HH3-C2LX/LS08S6HT3-C3LS/MT3728VC |
/LS08S6HT1-C3LS | |
LS08S2SHEASH1-C1LX | SS8482-C1LV |
LS08S2SHESH1-C4LX | S8481-C2LV |
LS08S6HEH1-C4LX | DB7899-FL02U/LS08S6HEH1-C6LX S8481B-C1LV |
NT39538H-C1272A | 8656-CYOB,8157-CCYOHD |
NT39565H-C5253A | 5223-DCBPW |
NT39610H-C2006A | MT3113VA |
NT39658H-C1294A | 8033-GCYO7 |
NT39809H-C1455 | NT39808H-C14A4A MT3102A-VE |
NT39812H-C1261A | S6C27A7-51V |
NT39911H-C1275A | 8033-DCYOE |
NT39918H-C02K6A 长 | NT39918H-C02M2A |
NT39921H-C02B7H | RM92120FA-038 RM92122FA-058 D160974NL-051 |
NT39921H-C02B7B | RM92122FA-058/D160975ANL-051 |
NT39981H-C02M2A | NT39918H-C02K6A |
NT39931H-C02F7A | D160994NL-054 D160994NL-051 |
NT39935H-C5213A | NT39935H-C5226A |
NT39935H-C5226A | NT39935H-C5213A |
NT39935H-C5254A | NT39980H-C5256A |
NT39935H-L5206B | 8154-ECBL6 |
NT39938H-1272A | 8656-COYB |
NT39941H-C0217B | RM92150FC-0CC |
NT39962H-C05D5D | D160971NL-055 |
NT39941H-C02J4A | RM92160FB/RM92150FB-095 |
NT39941H-C0217B | RM92150FB-095 |
NT39658H-C1294A | 8033-GCY07 |
NT39962H-C5107A | 8031-DCBKO |
NT39980H-C5256A | 8159-CCBQ |
NT39981H-C02J5C | NT39981H-C02J1C RM92160FE-OAD |
NT39981H-C02J1C | NT39981H-C02J5C RM92160FE-OAD |
NT39981H-C5428 | NT39981H-C0265A |
NT39985H-C02M9A | RM92161FD-OAS |
NT39985H-C02P1A | RM92161FB-OAN |
NT39985H-C02M4A | LS0896BD3-CBLX |
NT39986H-C0265A | D160962NL-051 |
NT39986H-C5248A | 8157-CCBPP |
NT39986H-C5265A | NT39986H-C5248A |
NT39990H-C6003A | LH16DD07,SSD3258UR1 |
NT39992H-C12A3A | 8157-CCY13 |
NT39992H-C1279B | 8157-CCYOHD |
NT39992H-C1279C | NT39992H-C1279A, NT39992H-C1279B/8157-RCY60/8157-CCYOHD/NT39892H-C12E2A/NT39812H-C1271A/ICN9305-01 |
NT39338H-C2005A | MT3407VC |
NT39386H-C5265A | D160962NL-051 |
NT39540H-C5232A | S6CG248-51B |
NT39573H-C6007A | SSD3273U2R4 |
NT39610H-C2006A | MT3113VA |
NT39646H-C5103C | NT39646H-C5103A |
NT39658H-C1294A | 8033-GCY07 |
NT39810H-C5215A | S6C27A7-52B/8157-CCBP4 |
NT39812H-C1261A | S6C27A7-51V |
NT39918H-C02K6A | NT39918H-C02M2A/NT65065H-C02T6A |
NT39921H-C02B7H | RM92120FA-038 |
NT39931H-C02F7A | D160994NL-054 D160994NL-051 |
NT39935H-C5213A | NT39935H-C5226A |
NT39935H-C5206B | 8154-ECBL6 S6C2710-84 |
NT39941H-C0217B | RM92150FC-0CC |
NT39941H-C02J4A | RM92160FB |
NT39962H-C05D5D | D160971NL-055 |
NT39962H-C5107A | 8031-DCBKO |
NT39981H-C02J5C | NT39981H-C02J1C/RM92160FE-OAD |
NT39985H-C02M9A | RM92161FD-OAS |
NT39986H-C5257A | NT39828H-C5275A/IL13102K5CD1-S |
NT39992H-C1279B | NT39992H-C1279A/NT39992H-C1279C/8157-CCY0HC |
NT39825H-C6008A | SSD3256UR4 |
NT39547H-C1277A | 8651-GCY08 |
RM92160FG-OAF | RM92160FE-OAD(完美代替) |
RM92161FA-OAM | RM92161FB-OAN |
RM92161FB-OAN | RM92161FA-OAM D160418ANL-051 RM39985H-C02P1A NT39985H-C02M4A |
RM92161FB-OAS | RM92161FE-OBO |
RM92161FD-OAS | NT39985H-C02M9A NT39985H-C02M9A RM92161FF-0CO/OCC |
RM92161FF-0C0 | RM92161FD-OAS NT39985H-C02M9A NT39985H-C02M9A |
RM92161FE-OBO | RM92161FB-OAS |
RM92165FC-OCC | D160418NL-054 RM92161FB-OAN RM96190FA-OAO |
RM92165FH-OCL | RM92165FK-OCU |
RM92165FK-OCU | NT39985H-C028A/RM92165FG-OCJ |
RM92312FC-80B | RM92312FC-80D |
RM92312FC-80D | RM92312FC-80B |
RM92370FB-801 | RM92370FA-809 |
RM92370FA-809 | RM92370FB-801/RM92370FA-819/810 |
RM92161FB-0AS | RM62161FE-OBO |
S6C2732-52 | S6C2732-52G/S6C2732-51 |
S6C2732-52G | S6C2732-52 |
S6C2732-61 | S6C2732-51H/AL7821-51B |
S6C2741-81XN | S6C2771-04 |
S6C2772-52 | S6C2775-51 S6C2775-21 S6C3101-53 |
S6C2774-54U | 8154-ECBML |
S6C274J-51U | S6C274J-56U/D160253NL-055 007 |
S6C2792-61 | S6C2B91-64 |
S6C2792-52 | S6C2775-51/ S6C2792-54 |
S6C2792-54 | S6C2792-52 |
S6C2A71-51 | S6C2A71-51G |
S6C2A72-52U | D160987NL-052 D160987NL-055 |
S6C27A7-51V | NT39812H-C1261A |
S6C2B91-61 | S6C2B94-61 S6C2B91-63, S6C2B91-64 |
S6C2B91-63 | S6C2B94-1 S6C2B91-61 |
S6C2B94-61 | S6C2B91-61 S6C2B91-63 |
S6C2B91-64 | S6C2B91-61 |
s6c2b91-54b | S6C2B91-51B |
S6C2B93-54 | DB7897B-FT08M |
S6C2B96-53 | DB7893-FT10M |
S6C3703-53G | S6C2B94-64 |
S6CG221-51 | 8674-BCC96 |
SS8303A-C2SS | MT3728VC |
SS8303H-C2SS | LS08S6HT3A-C3LS/LS08S6HT3-C3LS/MT3728VC |
SS8310-C1LX | LS08S2M7-C3LX |
SS8310-C4LX | MT3717AVC |
SSD3258UR1 | LH16DD07 |
SS8303C-C2SS | SS8303H-C2SS |
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 repair machine for TV LCD panel inside circuit repairing means almost all faults caused by screen inside circuit are can be repaired by a laser machine. And laser machine also can repair some COF/TAB faults (instead of a bonding machine).

- Each Pixel is composited with 3 RGB original colors.
- Each color brightness is controlled by one COF line.

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


In glass, usually have some spare wires for repairing.
In normal condition, there is an 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.

Solution: Connect to the same color wire

Step 1: Cut spare wire

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.

Short circuit between two wires, just cut it with the laser.

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.


User laser machine to repair a vertical line on LCD LED screen

When come with a COF wire broken problem:
Change a new COF
Repair as Case 1
Method 1 advantage:
Perfect display after repairing
Method 2 advantage:
a. Fast repairing
b. No need consumable material, low cost.
LCD COF TAB BONDING PROCESS STEPS
- LCD/LED fault mark :

2) Glass and PCB fixation:

3) Tool for COF remove:


4) Hot gun parameter Setting:


Temperature Range: 330 degree.
Air flow of hot gun: 2-3.
5) COF disassembly:






6) ACF remover liquid G750 apply on COF

Don’t touch the liquid with your finger or skin. If the liquid splash to skin, please washing with a lot of water. You can wear gloves to protect your hands.
7) ACF removing liquid chemical reaction :

8) Wash in simple water :


9) Old COF cleaning :


1. Put the COF on a clean glass table;
2. Fix the COF by left hand finger (don’t touch the chip on COF, will damage it);
3. Right hand take a clean peace nano sponge with acetone;
4. Clean the ACF follow the direction of pins from inside to outside of COF. Please note only clean in one direction, don’t clear in vertical direction of the pin, or from outside to inside of COF.
10) Glass cleaning :

• Fix the panel little bit outer of the table.
• Put left hand on the panel to support it take a clean peace nano sponge with IP ;
•Clean vertically with nano sponge;
•Repeat step 3 and step 4 until the Glass is clean.
11) PCB cleaning :

12) Glass checking :


13) glass cleaning under microscope :

14) COF checking :

1. Check if there is residual ACF or dirty things on the pins, then scrape them by cotton swab carefully.
2. If the pins curved or broken, please drop this COF.
15) New COF cutting :


1. Before cutting, please check the cutter if it is undamaged and sharp;
2. Put the COF reel under the cutter at properly position;
3. Cut the COF with fast speed;
4. After cutting, check the COF with microscope;
5. If COF not very clean, clean it with electrostatic cloth and acetone.
16) ACF model :


ACF should be stored in low temperature (like store in fridge), before open ACF should in freezing chamber, after open should in cold closet, and sealing with a hermetic bag. Waiting 15 min for thawing after pick ACF out from the fridge. Please noted the valid date of the ACF, which wrote on the ACF label. ACF should not be used when expired. Put ACF back to the fridge after every day work finished.
17) ACF attaching part 1 :


When attaching, fix COF on glass table by left hand, put ACF on COF pins with a tweezers, and make sure a perfectly alignment between ACF and COF pins.
After attaching, pre-heating the ACF with a T type iron, this will make a good connection between ACF and COF, prevent ACF fall from the COF when moving.
18) ACF attaching part 2 :


19) Panel moving and placing :

Please note should put two hands in the center of the ITO. Make sure the ITO is smooth and steady.
Take care when placing ITO on platform, don’t let it strike the quartz holder and other part of the machine.
For big ITO, can move it with suckers.
20) Bonding machine operation – parameter selecting :


21) Bonding machine operation – panel alignment :



22) Bonding machine operation – camera adjusting :

23) Bonding machine operation – COF fixture :


24) Bonding machine operation – COF adjustment on XYZ direction:

25) Bonding machine operation – Teflon tape:

The bonding pressure should between 2.0Mpa~4.0Mpa, the pressure can be setting by the regulating valve.
26) Bonding machine operation – alignment image:


For new COF, alignment is more easy;
For used COF, is a little hard for aligning, because used COF will curved, shrink…
27) Bonding machine operation – double start:

During the automatic bonding process, you can press the emergency button at any time to stop the process.
28) Bonding machine – automatic Bonding :

If OK, please do next step, PCB side bonding.
29) Bonding machine – PCB side alignment :.

•The head should cover full bonding area.
•Align the PCB and COF pins, can assistant by a magnifying glass. There are marks on PCB and COF will help alignment.
30) Bonding machine operation – put silicon tape :

The length of silicone tape should longer than COF length.
31) Bonding machine operation – PCB side automatic bonding :

During the automatic bonding process, you can press the emergency button at any time to stop the process.
32) Testing after Bonding :

If not repaired, analyze the reason and repair again.
Usually, bright-line means short circuit; dark line means of the circuit.
Get More Information: led lcd panel repair training
Bonding Machine model KD891 version3.0 is ready to dispatch.
Bonding machine KD891 version 3.0 will send to Oman:
Bonding Machine model KD891 version3.0 is ready to dispatch. We will send this machine to Oman.
May 2021
Bonding machine model KD891 send to Dubai:
Today evening the KD891 binding machine is send to Dubai. With all accessories machine body packed and loading truck. This machine small and easy to install. He take online training from us.
Mar 2021
KD891 version 2.0 single head bonding machine send to Nepal:
Bonding machine model number KD891 version 2.0 is send to Nepal. This machine have XY moving Microscope feature. The machine body packed.

Jan 2021
KD891 version 2.0 bonding machine is send to Philippines:
Date Today afternoon the KD891 version bonding machine send to Philippines. Photo is take when machine body package loading truck.

Dec 2020
Single Head Bonding Machine Model KD891 version 3.0 send to Bangladesh:
Today morning KD891 version 3.0 bonding machine is send to Bangladesh. With all accessories this machine body packed in wooden box.

Nov 2020
Single Head Bonding Machine KD891 version 3.0 send to Jordan:
Bonding machine version 3.0 model send to Jordan. This model have 2 main features one is XY moving microscope in back side and second is front camera for PCB track matching.
LCD LED TV FAULT WHICH CAN BE REPAIR BY BONDING MACHINE
The most frequently asked question is what are the faults which can be repaired by a bonding machine?
The principle of a bonding machine is for COF/TAB changing, which means all faults caused by COF/TAB are can be repaired by a bonding machine for TV panel repair.
Here are some sample faults which can be repaired by a bonding machine:























