Now the price of an infrared thermal imaging camera is falling very quickly, it's worth thousands of dollars, and now it's only 400 bucks to buy an infrared thermal image。
Although the price of the infrared thermal imaging camera is proportional to the price of pixels, i wonder why the price of the infrared camera is higher than 240*240, even though 240*240 is more than 256*192
1. Maintenance of door-ban main boards
A fan in the field was under lock-in when it was necessary to reset the data because of the data contained in the off-door mainframe, and it was very difficult to replace the new mainframe, so it was hoped that i would repair the damaged main panel。
To be honest, there is a real difficulty in repairing these circuit boards, which have no data on drawings. First, the main plate power, which needs to be traced, then vcc and gnd, and then the power voltage. Vcc and gnd are relatively easy to find, and electricity needs to be tested from low to high。
For a single plate, we need to understand that normal power supply is usually +5v or +12v, or maybe +19v, or 24v or 36v. There are also very few circuits that could be powered by poe, which is 51v. If you use hand-to-hand power, it's 70 v。
Whatever the voltage, enter the main plate through the dc-dc transformer circuit above the plate and turn the high voltage into +5v, or +3. 3v, +2. 5v, +1. 8v, +1. 35v, etc., for use at all levels of chips above the voltage supply panel。
I'm watching the main panel because it's usually 12v, and the 485 reading chips on the board are used +5v. I used +5v to power the plate, and the result was a communications chip 485 we3080eesa chip with only 3. 08 v, which means that +5v was wrong。
The +5. 06 voltage of the we3080eesa chip following conversion to +12v power supply. However, although the power voltage was found, the whole machine was not working, so i used thermal imaging to look at it, and only 485 reading chips were found to heat, while cpu did not heat, which suggests that cpu had problems with electricity。
Finally, a careful examination of the main board revealed that an insurance barrier to cpu electricity had been accidentally damaged and had not been delivered, so that the 3. 3 v of cpu electricity could not be delivered, so that, of course, cpu could not work without it。
To replace the safety barrier and then turn it on, you hear the sound of the plate being activated, and in a matter of seconds the red and blue light above the plate starts to blink。
2. Maintenance of lcd monitors
Both the current borderless lcd monitor and lcd tvs use side-in-side light sources, and lamps are generally installed under the lcd screen. Because of the different design lines, the lamps above the lamps may be a whole set of cascades or multiple groups, with four or five groups on one lamp. When a light bead is damaged, it does not result in the whole lamp not being lighted, but in a group not。
The light beads are hot when they work, so the heat image is used to see which group of beads is not on at first sight and need not be judged by changing the display pattern。
3. Maintenance of the nut projector
Last week, a projector of nuts was repaired, and the failure was neither electricity nor power. When i got the machine, i pulled out the main plate, put it through the test machine, and with thermal imaging i found two obvious hot spots on the main plate。
One of them is a protective separation tube, the other is under the dispersive sheet and has a relatively high temperature. When the radiator is removed, the photo is taken again, and the chip and the sticker are found to be multiple and hot. At this point, using micro-species, it is quickly located on a patch of electric caps。
The electrostatic patches were cut and found to be short-circuited. A careful look at the electric capacitor, which, because of the prolonged heat, has become significantly dark. The problem was solved by removing the damaged patch and replacing a new shielded power supply。
4. Maintenance of capture cameras
The day before yesterday was repaired with a haikang capture camera, 2 million ultra-dynamic, which was sent without response from electricity, no light on the signal and no light on the internet. This scout uses 12vdc or 24vac。
The breaker found that a filtered convulsion had been packed on the power plate, that the main plate had a normal voltage of 1. 8v, 1. 35v normal, and +5v normal, but that +3. 3v was only 0. 86v, which indicates that +3. 3v had short circuits or that the voltage conversion chip had problems。
Taking photographs with thermal imaging cameras, it was found that the dc chip of 3. 3v was clearly very hot, but the inspection of 3. 3v loads did not reveal short circuits, which suggests that the chip itself had problems。
To replace the eight foot sticker power chip, the probe will start。
So, if you want to do good, you must first use your means
