Hi! If the LCD cables are not correctly seated, it will turn on for a 1-3 second(s) and the screens flickers for a second and then it will turn off by it self. Are you sure that both screens (and cables) are good? Did you recently replaced the lower screen? If yes, you need insulation on the back of the screen to prevent a short.
Hi! Well basically it could be multiple things. But the most common issues related to this: (1) The APU needs to be reballed OR (1) The power supply is broken Are you able to test with other parts? The most easiest part to replace is the power supply. You could order one and test it.
Most of the times the battery pins are dirty or there is corrosion on it. Did you checked your battery pins? Otherwise clean it (with isopropyl alcohol) and then dry it, leave it be for a while and try again with new batteries. If that won’t work, it’s motherboard related, and you should check the components on the motherboard.
Hi! The easiest way is to order a capacitor set exclusive for the GBA SP. Be sure that you search for the SP as the (normal) GBA uses other capacitors (100uf 6V - 4V). Sometimes the specification is written on the cap it self, is there no info at it? You could also sent some pics if you want.
Hi Joshua! I bet the only solution to fix it, is to solder it again. Please check the copper traces, as there is still copper on the connector it self… If the traces are damaged you need to fix this first before you solder the connector to it. If you don’t have experience with soldering, you could check if there is a local repair store who can fix it for you.
Hi! Most of the time, the following (small) parts needs to be transferred: (1) Home button (Touch ID) (2) Earpiece speaker (3) Camera (Sensor Assembly) (4) EMI Shield You could also buy a display assembly with the small parts already in, but this will make it more expensive, and if the other parts are working, I would recommend the display without the small parts. I’m not familiar with MD battery’s… Perhaps someone else here have experience with them. But be careful with cheap batteries, they will age (most of the times) way faster compared to other batteries.
Hi! Can you manage to open your 3DS ? Maybe the plastic button is broken from the inside and is not able to click the button in as it should. It also could be the button it self which is not aligned to the plastic button. Please follow this guide if you want to check for yourself: Nintendo 3DS Right Shoulder Button Replacement