Zega Mame Boy - Troubleshooting

This can happen for a number of reasons.

• Ensure you are using the correct image. Check the PCB version number and ensure you have downloaded the correct version. Version 2.7 and newer boards cannot use images for version 2.6 and older.
• Ensure both PCB and rubber pads are cleaned thouroughly. Check this video, sometimes a little more than a rub with isopropyl alchohol is needed.
• Check the 40 Pin GPIO header solder points for the affected input does not show any signs of damage and is soldered correctly. Check the GPIO pinout for the pins to check. 

• Ensure both the Speaker and Headphone jack are securely fitted.
• Ensure the volume wheel is set correctly and turned all the way up.
• Check the volume wheel soldering for signs of shorts or incomplete soldering.
• Check the 4 pin connector on the mainboard and Headphone jack PCB for shorts and correct soldering.
• Check the 2 pin speaker connector for shorts and correct soldering.
• Check the speaker wire soldering.
• Check for loose pins on the Mainboard FPC connector.
• Check for loose pins on the Charging Board FPC connector.
• Check the mainboard 40 pin header GPIO audio points for any signs of a loose solder joint

• Ensure the contrast wheel has been turned all the way up. If you soldered the contrast wheel yourself, check the soldering on each pin and ensure there are no shorts between pins.
• Check all 3.3v and Video pins on the Mainboard 40 pin header for any loose connections or signs of damage. Check the GPIO pinout.

• If you have soldered the LCD yourself, double check there are no shorts and every pin on the ribbon is securely soldered.
• If you soldered the Raspberry Pi header yourself, check the header soldering
• Check all 3.3v and Video pins on the Mainboard 40 pin header for any loose connections or signs of damage. Check the GPIO pinout.