Logitech wireless solar keyboard k750 repair

I think that a keyboard of my favorite brand should last longer then 2 yrs and I had never such a bad experience with logitech devices. But the keyboard module is so glued and melted together, itвЂ™s useless to even think about getting it apart and fixed.

Now I have 3 functioning solar panels and rechargeable batteries and can only assume that the keyboard module is the issue. So I bought 2 вЂbrokenвЂ™ ones and thought I find out whatвЂ™s wrong and hoped to eventually fix them. The solar panels deliver about 3.x volts, the battery is at 3.04V, but no battery-check LED and most important, no function/connection to the logitech unifying receiver. I still got 3 of them вЂ¦meanwhileвЂ¦broken ones. Not sure if anyone is still working with these k750 as this post is slightly dated. Hi all, and really great to see someone took a closer look!

However, IвЂ™ve found that if вЂjumpstartвЂ™ it by shorting the V_BATT and V_MAIN terminals together for a few seconds, then it works again until it is turned off. Once itвЂ™s off, it canвЂ™t be turned back on. If I try turn it off, it doesnвЂ™t turn off immediately, but only after a few minutes. My original keyboard is still working after replacing the battery. Now I have two working K750 keyboards, although one is slightly disfigured. So with it in pieces, I ordered a replacement battery. This also meant my disassembly was completely unnecessary. I measured the V_MAIN on the test points, and it showed an match 2.0V, like with the вЂbadвЂ™ battery. Apparently a 0.15 V drop on this battery is enough to stop the keyboard working. I measured the voltage and it reflects marginally over 3.03 V. So I popped my battery out of my new keyboard, and lo and behold it worked. I tested some other components but couldnвЂ™t find anything notably wrong with the board. With my old battery plugged in, V_BAT showed 2.86 V and V_MAIN showed a steady 2.0 V. So to disassemble it you have to pry that off, making reassembly difficult.ДЄfter that there are a number of screws to remove, and then the base separates, giving you access to the circuit-board. Although the battery comes out relatively easily, the keyboardвЂ™s faceplate is glued into place. I found it the other day and decided to take another look. I figured IвЂ™d salvage the solar panels or something. This was over a year ago in-between a lot has happened, but Logitech didnвЂ™t ask me to return the old keyboard, and I couldnвЂ™t bring myself to throw it out. The keyboard had a 3-year warranty I was still within, so after the retailer rejected me, I contacted Logitech who were kind enough to send me a replacement that continues to work perfectly. My battery measured 2.9V, so I assumed it was still fine, and something else had gone wrong. The battery used is a rechargeable coin-cell battery, similar to what is used on motherboards, an ML2032 3.0V battery. The battery is not supposed to be replaced, but is relatively easily accessible, so I popped it out and measured the voltage. Not registering keypresses, nor activating any of itвЂ™s notification lights. Two years later, on returning from a short trip, the keyboard no longer worked. So joyous was I to find it on a half-price special at some stage, promptly ordering it and enjoying itвЂ™s use. Besides that itвЂ™s a standard wireless keyboard that uses LogitechвЂ™s unifying receiver, I additionally like the style and design of the keyboard. A dream come true to me, who in general is disposable battery averse. This should mean you never have to replace the battery. ItвЂ™s most noticeable feature is the fact that it has a bar of solar panels along the top of the board which are used to charge the built in battery. Since the Logitech K750 was first released, I was a fan. Tl dr: Thought keyboard was broken, only needed battery replacement.

Logitech wireless solar keyboard k750 repair