A NR2O5 home router has six green LED indicators on the panel, namely SYS, PC4, PC3, PC2, PC1, and WAN. Most of the SYS is not bright after booting, and the remaining five are sometimes weak and cannot work properly.
By turning on / off multiple times, SYS can occasionally turn on, and the system can work normally only when the SYS indicator is on.
Disassembly test found that there is some bulge on the top of the capacitor C62 in the power supply part, and the temperature rise is too high when touching it. The parameter of this capacitor is l000μF / 16V. It can be charged and discharged after digital removal. Another comparative test with a new 1000μF capacitor found that the new capacitor enters the last digit of the digital meter every 10 seconds, and the old capacitor of the original machine enters the bit within 4 seconds, indicating that the old capacitor There is a certain capacity, but it has begun to fail.
According to observation and analysis, there are three main reasons for the failure of the capacitor; one is the problem of the circuit, the second is the quality problem of the capacitor itself, and the third is that the voltage value of the selected capacitor is not high enough, and the voltage tolerance is not enough. Especially for the circuit boards with high component density, in order to reduce the volume of the capacitor, the voltage value of the capacitor should be reduced as much as possible, which leads to the failure of these capacitors.
As long as the conditions permit, try to increase the withstand voltage value by one-fold, two-fold, or even three-fold. In this overhaul, a 1000μF / 50V capacitor was specially selected to lengthen the pin and place the capacitor above the chip component area. After bending down and soldering, the router works normally after replacing the capacitor. Note: The height after bending shall not exceed the height of the original capacitor of the original machine installed vertically (as shown in the figure.)
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