exxos wrote:You didn't break your reset switch did you, I did that other day, similar issues
exxos wrote:It can't be much if it was working and now isn't. My reset spring flew across the room, no idea where the insides went It was at night time, so I thought I would leave it until morning. When I connected it up, I forgot the switch was bust and it just sat there black screen. I changed it, then it was stuck on a white screen I added some more uF to the rest circuit and it solved it. having a working reset switch is always a good place to start
exxos wrote:If your reset switch is making the RESET line go high and low, then it seems good. You could spray and wipe the IC pins and sockets with IPA, cotton bud will get the black off it all. Im not sure from your post if your TT was working before you tried the card in place ? was the card knowing working to start with ? possible it could have killed the CPU ?
exxos wrote:isopropyl alcohol. Strange how you pretty much took the lid off and it stopped working ? You could try pushing down on each chip in turn while turning on the psu and see if you can locate where abouts the a bad connection might be. Also tip it upside down and just give it a few taps in case you have a stray bit of solder floating around in there or a screw or something daft.
simbo2 wrote:so when you burned the eproms
did you disable the 'write 0XFF to the end of the ic' ???
you need to disable it
first thing to do is flash the ics without this setting
then double check the CRC
black screen is no bios load white screen is bad stram or bad funnels
only no tos load
because you need tos to start too load the gdi to init the video ??
perhaps its just the roms
simbo2 wrote:if the halt is low the mpu is halted
did you check its getting clock signals
the jumpers for the roms are set too the right type???
simbo2 wrote:its a good guess then the mpu has failed or the mcu or dma
usually you get a white screen even if the dma fails
so leaves mpu and mcu...
lets hope a working mpu will fix it
otherwise its a few tests and making a chart of results to track the issue down
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