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

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

Post by 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
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Re: Steve's H5 A3.14 Build (Chicken Pie edition)

Post by 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?
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exxos
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Re: Steve's H5 A3.14 Build (Chicken Pie edition)

Post by exxos »

Steve wrote: Fri Jan 01, 2021 5:25 pm 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 ?
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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Re: Steve's H5 A3.14 Build (Chicken Pie edition)

Post by Steve »

Yes but it costs zero pounds and can only give me good information?
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Re: Steve's H5 A3.14 Build (Chicken Pie edition)

Post by 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.
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Re: Steve's H5 A3.14 Build (Chicken Pie edition)

Post by 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.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Steve
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Re: Steve's H5 A3.14 Build (Chicken Pie edition)

Post by 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
PXL_20210220_154418824.jpg (304.28 KiB) Viewed 2746 times
Pin 7, green:
PXL_20210220_154707578.jpg
PXL_20210220_154707578.jpg (307.75 KiB) Viewed 2746 times
Pin 8, blue:
PXL_20210220_154826885.jpg
PXL_20210220_154826885.jpg (296.79 KiB) Viewed 2746 times
Videos of reset behaviour (As I'm not sure what I'm seeing, need help with understanding)
Red:
Green - same
Blue:
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exxos
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Re: Steve's H5 A3.14 Build (Chicken Pie edition)

Post by exxos »

There is 3 bits for red green blue..
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Steve
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Re: Steve's H5 A3.14 Build (Chicken Pie edition)

Post by 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
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Re: Steve's H5 A3.14 Build (Chicken Pie edition)

Post by exxos »

Steve wrote: Sat Feb 20, 2021 5:55 pm 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..
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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