Forgottenmyname - Progress - Part 2

Post by **PhilC** » 24 Dec 2018 20:26

Good news part 1, hopefully followed close by part 2, :lol:

The STF boots to desktop. I've still not fixed the Vsync, which is next, the screen just keeps rolling but i can see text etc.

Also the screen is very dark, so not sure I've implemented the DAC board properly.
I didn't fit the RGB part of the board but have fitted the monitor unf*ck board.
I have three 39 ohm resistors in the line to the RGB, so guess I could try removing them?

Next step to get that Vsync working now.

Post by **exxos** » 24 Dec 2018 20:27

:bravo:

Yeah you can try removing the resistors.. The jumper on the DAC board can also down/up the brightness a tiny bit as well.

EDIT:

If you have the diodes in place from the original RGB circuit then that drops the brightness a lot.

Post by **PhilC** » 24 Dec 2018 20:34

exxos wrote: 24 Dec 2018 20:27 :bravo:

Yeah you can try removing the resistors.. The jumper on the DAC board can also down/up the brightness a tiny bit as well.

EDIT:

If you have the diodes in place from the original RGB circuit then that drops the brightness a lot.

Only fitted the diodes to the composite circuit on the STF. what about the large caps on the DAC?

Found vsync goes to the MMu but doesn't make it to the monitor port, odd but at least I know what the problem is.

Post by **exxos** » 24 Dec 2018 20:49

Forgottenmyname wrote: 24 Dec 2018 20:34 what about the large caps on the DAC?

It looks like they are not needed. I removed them on the V3 layout in fact.

Forgottenmyname wrote: 24 Dec 2018 20:34 Found vsync goes to the MMu but doesn't make it to the monitor port, odd but at least I know what the problem is.

Ah yep, think you mentioned that the other day..

ahh I was thinking H-sync before with the fixes...

https://www.exxosforum.co.uk/forum/viewt ... 1185#p9963

VSYNC goes from the MMU to GLUE to RGB socket and the 3 diodes in the comp-gen circuit...

0.jpg

Post by **PhilC** » 24 Dec 2018 20:53

yeah, it confused me a little, LOL.

Vsync is fixed but still very dark pic, so wondering if I've cocked something up on the DAC board

Post by **PhilC** » 24 Dec 2018 21:43

Exxos, where did you pick up BLANK from? I think its something to do with that. I've tried it on Glue pin 36 but doesn't make any difference to the darkness of the display.

Post by **exxos** » 24 Dec 2018 22:52

Forgottenmyname wrote: 24 Dec 2018 21:43 Exxos, where did you pick up BLANK from? I think its something to do with that. I've tried it on Glue pin 36 but doesn't make any difference to the darkness of the display.

Can pick it up from the yellow traces...

bl.jpg

The dark stuff started around here...

https://www.exxosforum.co.uk/forum/viewt ... 230#p14730

Post by **PhilC** » 25 Dec 2018 10:54

Thanks will have a read later when everyone else is having their post dinner sleep.

Post by **exxos** » 01 Jan 2019 16:14

Have you made any progress yet :)

Post by **PhilC** » 01 Jan 2019 17:48

exxos wrote: 01 Jan 2019 16:14 Have you made any progress yet :)

Christmas and other stuff got in the way. I think I'll pop the original RGB bits on the board and get it all working ok with that and then sort out the DAC.

Forgottenmyname - Progress - Part 2

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