Broken screen on the leapster explorer

SOURCE: Hi... I have a leapster

If your Leapster2 does not respond to the stylus pen, it needs to be calibrated. Calibrating the Leapster2 is easy:
1) Ensure that a cartridge is not inserted 2) Hold down the Hint button while turning the unit on 3) When the LEAPSTER menu screen appears, press the A button 4) Touch each of the crosshairs that appear with the stylus 5) Restart unit

SOURCE: Leapster screen not responding to the stick

If you don't see any X's then you have to clean the screen very well with some Windex and dry it well. Take any crumbs out of the screen edges and then "milk" the screen with the thumb gently. What happens is that the digitizer gets pressure areas built up so you want to dislodge it. You might need 3-4 "milking" tries. By milking I mean pressing on the screen with the thumb (gently) till you see the screen "bleed."

Also after this align the screen.

SOURCE: My son's Leapster Explorer suddenly

I had same problem, just fixed it by a little hack. The volume up switch is broken.
1. Remove accessory door on bottom. 2. Remove all screws on back. 3. Open back cover.
Looking at the exposed board, there are 2 volume switches (back to back). Directly next the switches are four contacts: the upper 2 are for volume down, the lower 2 are for volume up.
4. Place the battery pack on the board and hold it down. 5. Press the power button to turn on the unit. 6. Use a small wire to jump the volume up contacts multiple times to change the volume to maximum (or desired level). 7. (Optional) Remove the volume buttons and throw away the rubber cushions to prevent the volume from changing. 8. Replace everything back in place.