lcd panel driver board burnt supplier

1. #Confirm whether the COF on side X is hot compared with the normal temperature, whether there is fracture or wear crack, and whether the COF is burnt.

3. #Confirm whether FP1 is open; if open, replaces fuse. If the 12V accessory of this model has a reverse diode, confirm the continuity of the diode and check whether it is burnt.

4. #Press the LCD glass side of the panel, if the vertical lines disappear or reappear, it can be judged that the cause of poor contact, OM checking should be able to find the poor contact.

Lamp line is broken Reconnect / replace lamp tubing Depending on the protection status of the power board, it may be a backlight with a dark band or it may be a point-off.

The above is the full text of LCD screen failure repair guide, we hope it is helpful to you. If you need to buy LCD and find a reliable LCD supplier, we suggest you to read our other great blog – How to find a reliable LCD supplier.

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Who can say ‘no’ to a free TV, even if it’s broken? This was the situation [Andrew Menadue] ended up in last year when he was offered an LG 39LE4900 LCD TV. As [Andrew] describes in the blog post along with videos (see first part embedded after the break), this particular television had been taken to a television repair shop previously after the HDMI inputs stopped working, but due to a lack of replacement parts the owner had to make due with the analog inputs still working. That is, until those stopped working as well.

The nice thing about these TVs is that they are very modular inside, as [Andrew] also discovered to his delight. In addition to the LG controller board, an inverter board and the power supply board, this TV also contained a TCON PCB. After some initial unsuccessful swapping of the parts with EBay replacements, nothing was (surprisingly) working, but it did turn out that the TCON and inverter boards are made and sold by AUO (major Taiwanese display manufacturer), along with the display itself.

In the end it turned out that the AUO boards and screen were fine, and after sourcing a board to convert VGA input to the LVDS signal accepted by the TCON board, the whole display worked. Naturally using a board with HDMI inputs would be nice, but it does show how a ‘broken’ TV can be turned into a really nice, big monitor without all too much effort if it’s just the controller board that went on the fritz.

While there are many common printed circuit board defects, one of the most notorious is burnt components. It"s also, unfortunately, one of the most damaging defects, as it can be difficult to repair and challenging to diagnose where the issue stemmed from.

Before we get into PCB failure analysis techniques, let"s first take a look at some of the reasons why a printed circuit board may burn. Burnt circuit boards aren’t necessarily a defect by themselves, and they are frequently caused by other inconsistencies or defects on the PCB.

But, accidents can happen. If a machine overheats or the board is exposed directly to flame, then that might not be the best situation for your components.

In other words, you want to avoid overstuffing the board. Not only will this reduce costs and accelerate production, but it can also help you avoid any costly mistakes that could come to bite you later down the road.

The most important part of manufacturing a PCB is the design phase, so if something is not quite right in the design phase, there will likely be consequences down the road. That being said, checking to make sure the right diodes and capacitors are specced out for the board will decrease the likelihood of component-failure related burning.

Boards might burn because of poor protections. The lack of properly sized fuse protection should be number one priority. A high voltage protection diode protects the board from burning in the event of a lightning strike or other voltage surges.

Other reasons for board burning are related to technician error. If the board connections are hooked up incorrectly or attached to the wrong type of power supply, leading to eventual burn out. In addition, if installation documents are confusing or nonexistent, a field technician might hook up the board improperly.

Conducting a PCB failure analysis is key to improving the product and preventing future defects from occurring. Here"s a look at some questions that we suggest asking that can likely help you resolve burnt component defects:

Always make sure to send your design to your board house for review before manufacturing -- think of it as a second pair of eyes on an email before you send. They may catch a mistake you missed.

Circuit board overcrowding isn"t just more likely to lead to burning, but to manufacturing challenges as well. Sometimes, preventing defects can be as simple as ensuring more adequate spacing on the PCB. Better spacing for high voltage and higher current traces can also decrease the risk of burning out a PCB.

PCB defects like burnt components can be a real pain, but partnering with an electronic contract manufacturer who has experience with PCB assembly can make all the difference.