Yesterday, an article was written about the breakdown of household appliances, many of which were not circuit boards, and some friends did not understand that it was the circuit boards that were the primary ones。
In fact, some appliances are made up mainly of circuit boards, which, of course, must have been broken。
Led tv, for example, has malfunctioned, almost 100% of the circuit board。
For the maintenance of these appliances, the acquisition of electronic knowledge and the maintenance skills of circuit boards are high。
If you don't know anything about electronics and circuit board maintenance, it's hard to do。
So, how do we fix this type of appliances
I. Carefully learn to switch power circuits and their repair techniques
Most of the current electronics are powered by switch-off power, with the highest failure rate。
It's not so hard to turn on power circuits, because they're the ones that are used. You just have to learn typical studies, and then you get a similar gradual digestion。
For example, the lcd switch power is now larger in size and power on lcd screens, with the main power source often using llc to resonate the semi-bridge to boost the switch power, while the secondary power source, because of its small capacity, often uses the inverse switch power。
In addition, the main power source added pfc power factor correction circuits to improve power factors。
For the above characteristics, the llc structural switch, as well as the inverse switch, have been identified with a typical circuit feeding principle and the study of the pfc circuit。
You know, you've learned a lot, you've seen a lot of them, you know, they're mostly chips, they're similar to other functions。
For example, the llc expands structural circuit features:
A power management chip drives two field-effect switches interchangeable conductor。
When the upper tube q1 leads, the lower tube q2 is closed. Power is charged to the capacitor cn through the upper tube q1, two telepathic ln and lm。
The upper q1 is closed when the lower q2 conduit is in place, and the pcn is discharged by two telepathic ln, lm lower q1 pairs。
When the upper tube q1 is connected, the secondary integrator d1 is charged to the output capacity co。
When the lower tube q2 is connected, the secondary integrator d2 is connected to the output capacitor co。
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Ii. Rationale for single-piece machines
The acquisition of electrical power circuits requires familiarity with its second largest component, functional control。
The circuit is centred on single-piece machines and provides effective control over electrical functions。
How to learn how to do a single machine
I. It is of the utmost importance to master the three elements of its work:
1 power supply
(c) capturing the size of its power supply and its source。
2 hours
(c) mastering its structural features and its overhaul methods。
Three
The way they are restored, the structure of the circuit and the way they are overhauled。
If these three elements of a single machine are abnormal, electrical failure, frequent death, time series errors, etc。
2. The three elements of a single machine are understood to inform its signal flow。
1 signal input
It includes key panels, remote input, sensors, etc
2 signal output and its drive to implement circuit characteristics。
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The circuit is a single machine that, according to instructions entered by the user, has an output-drive signal and a drive relay closed, thus controlling the equipment (element) to perform a function。
Structure and dismantling of electrical appliances
Electronic knowledge and maintenance techniques are available, as are the structure and dismantling of electrical appliances, and how to remove their casings and circuit boards。
In particular, the lcd light was damaged, and the break-up of the screen was a very delicate exercise, with high risks and a slight lack of attention, and the screen was scrapped。
So before you open it, do your homework just in case。
It's not easy, it's not overnight, but it's not impossible
If you learn, you're willing, one day you'll succeed
