protek

Hmm, good point. There is a HDMI version that is 60 fps and better resolution. http://www.ebay.com/itm/New-3-5-USB-Touch-Screen-HDMI-1920x1080-LCD-Display-Audio-for-Raspberry-Pi-3-/162285114464?tfrom=161643938962&tpos=top&ttype=price&talgo=undefined Gonna try the first one out anyway. I can find other uses for it.

This is an interesting project. I have also a dead Lynx II that I was tihnking of Raspifying. I got myself a Pi Zero and this TFT module that plugs straight over Pi: http://www.ebay.com/itm/161643938962

I now have a working Lynx II. I decided to get another faulty Lynx from ebay. It was indeed faulty as it wouldn't power up even with a cartridge inserted. It had a healthy screen however, so I transplanted the motherboard from the original into the new one. It turned out that some of the buttons in the new weren't working either so I had to open it up once more, move the LCD into the old case top and put it together. Now it's working perfectly. I have to see, if I could get at least the other motherboard working.

Thanks, Stephen. The ribbon connector is ZIF. It's still a pretty tight fit and I'm not quite certain that I got it properly inserted. It's snuggly there and it doesn't come loose, if I tug it gently but the contacts are slightly exposed, when the ZIF connector is closed. Is it supposed to be that way? The narrower ribbon is completely covered.

Mine is actually similar to this topic: http://atariage.com/forums/topic/180129-lynx-ii-lcd-with-horizontal-stripes/

I got a California Games module. The Lynx indeed boots and the game can be played but the screen is corrupt as per picture.

Hmm, makes me wonder. The Lynx was sold as non working but I'm starting to think that the seller may have not tested it with a cartridge. I'm waiting a cartridge to arrive to me. I'd better test it with a cartridge before I do anything else.

One question: do I need to have a cartridge connected in order to get a supply voltage for U6? Looking at the Lynx schematic, I see that the VDD pin is connected to the cartridge port.

I rechecked the voltages. Pin 10 was 0,11 volts and pin 13 was -0,11 volts.

I can double check but I'm pretty sure the voltages at 10 and 13 were 0,1V or thereabouts. Definitely not nowhere near 9 to 12 volts, when I measured them in relation to TP16.

I opened up the Lynx. I noticed that TP15 is located under a big heat sink, which has been soldered into the motherboard. I connected my PSU and tested the latch chip voltages from pins 10, 11, 12 and 13. Presumably in off state as I didn't have the top connected, neither 10 nor 13 gave 5V, when measured. All the pins were neither 0.1V or -0.1V.

Received the Lynx II the other day. Haven't opened it up yet but I tried it with an external PSU. The power LED faintly lits briefly but nothing else happens.

If I can get the fixerupper Lynx that I'm receiving to work, then I'm interested in getting one.

Thanks, Stephen! Those instructions look pretty systematic to follow.

I've yet to done any tests as I've not received the Lynx yet. I'm just trying to plan out a working procedure to find the fault.