P3.91 Series Circuit Paper LED Module PCB Pad Repair P3.91-2121/2020 /1818/1919/1921 120X120mm Pad Paper to Repair PCB During Installation

P3.91 Series Circuit Paper LED Module PCB Pad Repair P3.91-2121/1921/2020 120X120mm Pad Paper To Repair PCB During Installation Circuit Paper is a kind of double-layer flexible circuit board。Its thickness is only 0.08-0.1mm。 2.Composition of the Circuit Paper? Circuit Paper is composed of base material, pads, through hole, wire and screen printing. 3.Where is the Circuit Paper used? The collision of LED display during installation, disassembly and transportation can easily lead to PCB pad falling off. At this time, you need to use the Circuit Paper to repair PCB. 4.How to use the Circuit Paper? First step, you need to prepare the following maintenance tools and consumables: anti-static bracelet, soldering iron, hot air gun, multimeter, tweezers, tin wire, solder paste, scissors, screwdriver, lamp beads, Circuit Paper, IC, etc The second step is to clean the damaged pad, scrape the damaged PCB pad with a knife blade, and wipe it with alcohol to prevent short circuit with the Circuit Paper. The third step is to cut different sizes of Circuit Paper and tin on both sides of the pad, so that the short circuit of the lamp foot can not be caused by too much tin. The fourth step is to adjust the soldering iron temperature to about 320 ℃, clamp the tin-coated Circuit Paper with tweezers on the left hand, align it with the position of the soldering pad of the PCB lamp tube, press it gently on the pad, and then heat it with soldering iron or hot air gun to make the Circuit Paper and the PCB pad fully fuse, pay attention to the common poles to be aligned; The fifth step is to light up the module, display in full white, adjust the brightness to the acceptable range for naked eyes by sweeping obliquely, weld the qualified beads to the Circuit Paper, pay attention to the polarity direction of the beads, and test whether the pins are connected with the multimeter before welding；

• Model:P3.91 indoor or outdoor LED module
• LED lights: 2121/2020/1921/1818/1820/1919
• Size:120MM*125MM
• Circuit Paper is a kind of double-layer flexible circuit board。Its thickness is only 0.08-0.1mm
• The collision of LED display during installation, disassembly and transportation can easily lead to PCB pad falling off. At this time, you need to use the Circuit Paper to repair PCB