NOTE: Don't attempt this unless you are competent at fixing delicate electronics! Work SLOW and be careful at every step or you could ruin your tablet. Ground yourself and eliminate static charge by holding a (plugged in) metal kitchen appliance or anything electrically conductive that is connected to earth.
Many people experience intermittent problems in various forms which are caused by poor assembly at the factory. Armed with the right information and some somewhat basic DIY skills you can fix simple problems yourself.
3.5MM EARPHONE SOCKET PROBLEMS:
The problem that I and others experience (sound only from one earphone) is caused by the internal audio socket being recessed too far into the hole. There is about a 1.2mm gap between the inside of the rear plastic panel and the front of the audio socket.
Because of this, a lot of earphone plugs don't reach far enough to get proper stereo contact. However Ainol supplies earphones with a slightly longer 3.5mm plug to get around this issue.
Sometimes all that is required is to carefully but firmly push your non-Ainol earphone plug as far as it will go. This might work but still have an intermittent connection problems.
FLASHING, GLITCHED, PIXELATED OR BLACK LCD:
The above symptoms can be induced by cold temperature, lightly twisting the tablet or pressing on the back cover. If you are having these problems, most of the time it can be fixed by reconnecting the LCD ribbon cable to the motherboard and/or LCD driver.
Internal pictures of Hero:
-OPENING THE HERO
Open your hero by using a small (2-3mm wide) flat screwdriver starting at the TOP of the screen. Insert the screwdriver between the edge of the screen and the dark grey plastic back cover.
Carefully pry the plastic case from the screen assembly. The screen assembly unclips very easily when you know what you are doing. Don't force it! Work your way around the outside until all clips have been released.
-DISCONNECTING SCREEN ASSEMBLY
Now you have to remove the screen assembly from the motherboard. Open the clamps on the ribbon cable contacts with the same small screwdriver or with your fingernail (see picture of similar, non-Ainol LCD connector). The Hero (usually) has a white connector with a black clamp. Lift/unhinge the small black clamp on the smaller (touch screen) cable first from the side the cable enters the connector. Then disconnect the larger (LCD) cable. CAREFULLY LIFT THE LCD CABLE CLAMP ON BOTH SIDES at the same time or it might twist and break!
*If you are having LCD problems you may also need to re-connect the ribbon cable to the LCD driver board (under black tape). I replaced the black tape with multiple strips of 20mm wide Kapton tape (search 'Kapton tape' on e bay). You want the ribbon cable to LCD driver connection to be held very securely*
-REMOVING 3.5MM STEREO SOCKET
De-solder the 3.5mm socket and remove from PCB. File off the 2 small plastic 'key' tabs on either side of the socket. Then re-solder the socket onto the PCB as far forward as it will go (it should just be touching the inside of the plastic case).
Reconnect the screen assembly ribbon cables by inserting the cable into the connector, gently closing the clamp and pressing it down with your fingers. Check that the screen ribbon cables are inserted into the plugs all the way and are not crooked.
Test everything is functioning correctly (don't clip the screen onto the back cover until everything is working).
If it works, close it up by firmly pinching the screen bezel (black frame around screen) and back cover between your thumb and index finger...and your done.
Hopefully these instructions are useful!