My HP DeskJet 1050 printer had developed a problem. It wasn’t getting turned on. I traced the problem to its power-on button. The button had reached the end of its useful life.
How I found out about this problem
On one fine day, I had to scan a page. I connected the power adapter to the printer. I pressed its power-on button. Nothing happened!
The printer didn’t turn on. I pressed its power-on button a little bit harder. Still, nothing happened.
I applied even more force on the button and finally managed to get the printer turned on. There I found that the problem is with the button and not with the power adapter or with the printer itself. Thank God! It was a small problem. 🙂
I don’t use this printer daily. I use it as a scanner once in a while. So, I didn’t do anything and kept pressing the button harder whenever I had to use its scanner.
I had to replace the button last week because this trick didn’t work any longer. My degree in Electronics Engineering came in handy. I was able to solder a new button on the circuit board.
How I Fixed It
Here is the picture of my printer.
I removed its top plastic panel present on the left side. This panel had a circuit board underneath it. While removing this panel I broke three clips. 🙁
The circuit board was attached with this plastic panel by three screws. I removed those screws and also removed the small white ribbon cable.
I used a soldering iron and de-soldering pump to remove the faulty push button. In figure 3, you see the bottom-most push button is de-soldered. Well, this is the button to perform a coloured photocopy.
I had de-soldered the wrong push button. Oops! 🙁 The power-on push button is near the only white LED on the circuit board. The other LEDs are orange coloured.
I soldered the new push button. I bought this in 5 PKR only. If you are in Pakistan and want to buy this push button online, I recommend this website.
I finished by testing the newly soldered push button and then attaching the circuit board to the plastic panel by three screws.
If you have never soldered any electronic component before, it might be difficult to solder this push button. This button has four closely spaced pins. This might make it difficult for inexperienced people.
You should take a spare circuit board like that from a toy and practice soldering on this board.
If you have any questions, feel free to ask in the comments below.