Disassembling TP-Link Router TL-WR740N

zizheng18

Disassembling TP-Link Router TL-WR740N [Copy link]

 A TP-Link router TL-WR740N was routinely inspected and dusted. After opening it, I found it was relatively clean and there was no obvious moisture. I first suspected that the fragile electrolytic capacitors would age, but the inspection showed that there was no obvious change in appearance.

Please see the following pictures (from the appearance model to some chips):

Product model label, quality inspection small label. There is a trace of prying from the top left corner, and the same is true for the four feet of the router.

The internal layout seen after opening the top cover.

The front of the circuit board and its component arrangement. It can be seen that it is small and compact, dense inside and sparse outside, and the large components are placed on the periphery, the main chips are separated by a certain distance, and small components are placed in the middle.

The back of the PCB board is covered with a large area of copper, and no grid is used. It has good shielding and heat dissipation effects, and also has a certain effect on balancing the internal stress of the substrate. The positioning uses two small holes + two semicircular bayonet holes at the rear cover screws, which is simple and reliable. This component marked with MNC H7201DG is a network filter. Its function is to allow signals of a certain frequency to pass smoothly. Looking from the back of the PCB: it is installed between the crystal head socket and the circuit inside the board, which is equivalent to a "bandpass filter". This is a 19*4Pin main control chip. The welding points are relatively full when viewed with a magnifying glass.

This is another chip - 33*2Pin. There are several "snake-shaped lines" on the lower right of the picture, which are designed to balance the impedance on the line.

Below are several small chips and SMD transistors on the periphery.

[img=70 0,0]http://uphotos.eepw.com.cn/xqh518/pics/79b3a86bfd0c96860cb2727d005eee00.jpg[/img]

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Next, let’s take a look at the vulnerable parts that we are more worried about - electrolytic capacitors.

The specification of aluminum electrolytic capacitor is: 16V470uF. I don't know why I saved that one, maybe it's because of cost considerations.

In general, the look and feel is still quite good, whether it is the overall layout or the processing of subtle details (such as the printing on the board), it does not lose the style of a big manufacturer; after using it for so long, its stability and reliability are also pretty good.

停车说爱枫林晚

Yeah, not bad