Hi,The level shifters can also be the source of the problem. They translate the signals FROM/TO 5V and 3V.
In general you should check if there is activity in both input and output. If you notice a pin which is changing in the input but not on the output, then that chip is the problem.
Do can do this more or less quickly with a Logic Probe.
The level shifters are SN74LVC4245A and are used as follows:
* GFX: U10, U12, U14,U16,U18,U21
* Sound: U29,U30,U31,U32,U33
* Ensoniq: U5, U7
* Mainflash: U22,U23,U24,U25,U26,U27
Hi,Hi,
Okay, I will give this a try and report back during the weekend.
Thanks very much.
Hi,The level shifters can also be the source of the problem. They translate the signals FROM/TO 5V and 3V.
In general you should check if there is activity in both input and output. If you notice a pin which is changing in the input but not on the output, then that chip is the problem.
Do can do this more or less quickly with a Logic Probe.
The level shifters are SN74LVC4245A and are used as follows:
* GFX: U10, U12, U14,U16,U18,U21
* Sound: U29,U30,U31,U32,U33
* Ensoniq: U5, U7
* Mainflash: U22,U23,U24,U25,U26,U27
PM sent with all details.Send me a PM and we'll sort it out. Let me know when did you buy and from who.
Thanks
Hi,@Darksoft @Notsuoh
@Notsuoh is Australia based, I’m happy to have a look if that would help?
@Notsuoh the U numbers are the location on the board, they should be silkscreened on there. LJ245A sounds like the correct part numbers, they will be fairly small.
A multimeter should be fine to test them, you should see 5V on the side and 3v roughly on the output side. If any of them are burning hot to the touch that’s bad.