I think you get what you pay for. This was the cheapest replacement power supply I could find for my Viewsonic VX2770SMH. Unfortunately, the part that sticks into the monitor doesn't hold the stylus very well. You have to wiggle it and try to push it as far as possible to make the monitor turn on. I tried an old power supply and it fit like a glove. I would not recommend this product. Perhaps a more expensive version will serve you better.
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