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O que devo testar primeiro nesse caso

Parece que os sinais vermelho e verde na metade da área amarela estão em curto-circuito. Quando o sinal do 22º pino do chip do driver é emitido, ele entra em curto-circuito com o 2º pino de outra cor, resultando no fenômeno que você mencionou. ;

the 20pins IC is. and 24pins IC not. it's 16 channel drive output

@@samzhou8510 my displays use these ics please do you have any electric diagram for these ics HC245 74HC138D MBI5926G MBI5252GP?

pls watch another video,

I make it few years ago. Only have Chinese version.

@@samzhou8510 no problem great master thank you very much

hi @@samzhou8510 thanks so much for the video, very good content. even if the content is in Chinese can you share we will translate. Thank you once again

@@ericomlg give me your email. Will send to you.

Could you send me the Power point ir PDF to my email

A mixture of epoxy resin and some other materials

ofcourse if you want to do the repair.

ofcourse . because it have types text on side. like MBI5264, this is driver. and also they have Special arrangement. and the control IC normal is 74HC245. and each module have few of that.

Depend the PCB design. Have 1/2 scan for control 16*2 or 8*4 ，1/16 scan control 16*16 or 8*32. Lot of designs.

Have you tried the normal method to repair surface mount? To attach LED that fell off first clean/reflow the solder pads: apply flux, then solder with soldering iron. When pads look good and have enough solder add more flux, then place LED on top and use heat gun until solder melts. It may help to shield nearby parts from heat using pieces of cardboard so you only heat one LED at a time. Also turn down the heat gun fan speed. The weak mechanical strength sounds like a manufacturing problem, possibly not enough heat. You could try heating all the LEDs with heat gun or reflow oven (make sure all plastic parts are removed).

Yes, when repairing a P1.2 pitch led module, you need to be very careful because the beads are too small (1010) and the distance between the beads is also very small. At this time, you can only use a hot air gun to disassemble and weld new beads, usually using the minimum air volume and a temperature of 280-300 degrees. Some air guns may not accurately indicate the temperature, so you need to try raising or lowering them. They can basically melt the remaining tin on the solder pad in 3-5 seconds. When replacing the beads, you also need to pay attention to the direction of the beads because they are too small and it is not easy to distinguish their direction, and sometimes you need to use a magnifying glass; When welding, first use a hot air gun to heat the empty solder pad for 3-5 seconds, then place the lamp beads on the solder pad with tweezers, and use a hot air gun to rotate around the lamp beads for 3-5 seconds. Then gently push the lamp beads with tweezers. If the lamp beads can rebound naturally, it indicates that the welding is correct. If they cannot rebound, it indicates that there is too little tin on the solder pad or the welding is not successful; This is my experience sharing; Thank you for watching my video;

Dicolor UC series

Dicolor UC series

Of course you can, but if all 4 pins are disconnected, you need a 2*2 pad paper, because usually the power pins of the lamp beads are horizontal and the signal pins are vertical, so when you use 2*2 The pad paper can conduct the signal and power to the damaged position, allowing the lamp bead to display normally;

@@samzhou8510 thanks

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What is the problem?

We can supply to you. Need to know the pixel pitch. Lamps size.

smd 2121It's I'm trying to fix it at home Can I have a small amount of soda

The product size is p2.5 smd21211 We're going to repair it as an individual, not commercial. We're going to buy a small amount of pcb pad and lead. If you let me know the product page, I'll buy it

“ledtechhub.com/zh/collections/tools/products/p3-91-copper-foil-for-pcb-repairing” you can check this website. but the price is not correct.if you really want to buy. we can change the price and you can order onside. we will shipping it to you.@@myungchongpark3189

There are many brands and models in China. The soldering we commonly use is “BAKON BK3200"”, and the hot air gun is"ANLIXIN ".

actually we do led screen. not the pad paper.and if you need 1 of this . i think the shipping cost will much high than the goods.

Hi

Add my WhatsApp . Will give you solution

it's outdoor or indoor module? actually indoor easy to open the cover. and outdoor is hard. because it have screw foro mask. and also havery screw for PCB with cover. and that screw you can not see clear. because it's under the waterproof glue.

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