V star N450GTS short circuit+no power supply maintenance, the two power supply chips are replaced by maintenance! Pro-test normal use!

V star N450GTS short circuit+no power supply maintenance, the two power supply chips are replaced by maintenance! Pro-test normal use!

The maintenance of this video card is really a 60% discount for women to buy clothes, full of twists and turns! First of all, look at the appearance, there are simply compensated capacitors, Iraqi color, a lot of dust, simply clean up the dust! Measure the memory and core inductance without short circuit! Power on the test machine, boot protection, ooh, 12v short circuit, want to use the burning machine solution, think about removing the compensated capacitor first (because it is a bit ugly), and measure the short circuit after removing it, thinking that it will not be a dead chicken! Electricity measurement, sure enough, things are not that simple! No core power supply! Check the working conditions of the chip. The working conditions of UP6219AK,EN,VCC,VCC12 and boot are all met. It is judged that the chip is broken. I don’t have this chip at hand. I found that it can be replaced by UP6206AK. There just happens to be a motherboard with this IC. (This graphics card is powered by three phases, so it is easy to find many motherboards with three-phase power supply.) Replace it and measure the grounding resistance of each mos tube control pin. It is normal!

Power-on test, the core voltage came out, but there was no memory voltage. The memory power supply chip was APM8720A, which measured 7 pins EN, 5 pins VCC and boot. When the working conditions were satisfied, it was judged that the chip was bad, and this chip had to be replaced, because I didn’t have it. RT8120A could be used for replacement. This is a lot of use. Just take it down and put it on, and test that the resistance of the mos tube control pin is normal.

This post proves that UP6219AK can be replaced by UP6206AK; APM8720A can be replaced by RT8120A.