![]() ![]() The pins are numbered 1,3,5 on the bottom row and 2,4,6 on the top row. Pin 1 is marked with a white dot on the board.+3.3V supplied through the D4 position (diode or shorted).A diode is best, to protect the working machine from accidental power to the other machine. You must also either solder a diode in the D4 position, next to J3, or short the pads. To use an XO-1.5 as a programmer machine, you must solder a 6-pin (2x3) "header" connector to J3, located on the "top" (facing the LCD) side of the motherboard, below the main display connector. Furthermore, it is also designed so that one (working) XO-1.5 can be used to reprogram another (failed) one. The XO-1.5 is designed so that the SPI FLASH part can be programmed "in circuit" without removing the SPI FLASH part. Option 2 - Using Another XO-1.5 as a Programmer The main problem with this "replacement" technique is where to get replacement chips that are already programmed. ![]() It is a special alloy that makes solder melt at a much lower temperature, so you can remove the old part with little risk of damaging the board. If you aren't highly skilled, Chip Quik ( ) can make the job of unsoldering the old part much easier. This might seem like a lot of work, but people with the necessary tools and skill can do it very quickly. If you have soldering equipment and a replacement SPI FLASH part that is programmed with XO-1.5 firmware, you can simply unsolder the old part and replace it with a new one. Location of SPI Flash Option 1 - Replacing the SPI FLASH ![]()
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