Steve's H5 A3.14 Build (Chicken Pie edition)

[Steve]

@PhilC I might de-solder the monitor socket & put it in the ultrasonic.. I did try the good old wiggle but the colours didn't seem to change. I don't have the test equipment for checking multiplexer output, besides my multimeter.

[Steve]

Just an update.. removed / ultrasonic'd the rgb port, re-soldered.. still yellow

I was thinking of de-soldering the r g b matrix chips and putting them back in a different order, to see if the output changes - does this sound like a good idea?

[exxos]

I was thinking of de-soldering the r g b matrix chips and putting them back in a different order, to see if the output changes - does this sound like a good idea?

If your going to do that, might just be easier to get a new chips ?

[Steve]

Yes but it costs zero pounds and can only give me good information?

[Steve]

Okay - I'm in the mood to try to fix my H5 yellow display finally. I'll need some pointers if possible from you kind fellows. I now have my scope! So can test things properly. Or should I just buy 3x new matrix chips for r/g/b to start with.

[exxos]

I would start with holding down reset to get a white screen and make sure all the shifters RGB bits are all toggling , then try colour test on the diagnostic cart.

[Steve]

@exxos Okay - hopefully I've probed the right pins and gathered good data? Probed pins 6, 7, 10. R G B. Scope in auto mode.
Pin 6, red:

PXL_20210220_154418824.jpg (304.28 KiB) Viewed 3632 times

Pin 7, green:

PXL_20210220_154707578.jpg (307.75 KiB) Viewed 3632 times

Pin 8, blue:

PXL_20210220_154826885.jpg (296.79 KiB) Viewed 3632 times

Videos of reset behaviour (As I'm not sure what I'm seeing, need help with understanding)
Red:
Green - same
Blue:

[exxos]

There is 3 bits for red green blue..

[Steve]

I know it's bad to spoon feed to teach people, but I might need at least one spoon full. lol :) Am I anywhere in the ball-park with how I scoped the pins, to see these bits is it a setting in the scope? I really don't know, I'm new to this I apologize.

edit:
I may have found it, so scope pins 21, 22, 23 etc?

index.jpg (15.99 KiB) Viewed 3615 times

[exxos]

I may have found it, so scope pins 21, 22, 23 etc?

Yep, R0,R1,R2 etc

EDIT

Then check them on the outputs of the buffers..