atkelar | Restoration Project #9 - HP Jornada 820 @atkelar | Uploaded December 2019 | Updated October 2024, 3 hours ago.
After I made the last video, Karpour asked me if I could have a look at one of his Windows CE based devices. An HP Jornada 820, where the screen had some LCD column problem. Every 10 or so pixels, one column was semi-dead, but only in the upper half and also only one or two color channels. To me it was clear that either the connection between the glass panel and the driver was faulty, the driver chip had experienced a meltdown or - unlikely but possible - the LCD controller on the mainboard had some damage.
Karpour said, that he already had a replacement screen in a somewhat broken but compatible model that could be swapped out if needed. I agreed to give it a try, but suggested to skip any pixel-addressing fixes and go for the replacement screen right away, since it may damage the screen permanently if I tried something more... invasive.
Doing some research about the Intel StrongARM chip showed that the CPU is also the display controller. So if that was at fault, I couldn't do much. The CPU is a tight BGA chip and I have no intention of reflowing one of those any time soon.
Turned out to be "just" the display, because swapping the one from the broken model worked like a charm from the get go.
The plastic was about as brittle as it can get... some of the threaded inserts just crumbled away. I used epoxy glue to secure as many of the lose parts as possible.
Not shown in the video, but still an issue: The part that was broken in the damaged model is broken in all 820s it seems: There would be room for two screws to hold it in place, but HP decided that "one is enough" and so the entire tension of the hinge is always tugging on that one screw. Eventually the plastic there WILL break, as the hinge has a counter-spring to hold the display open or closed and it doesn't move easy on that side.
Links:
Wikipedia about the Jornada: en.wikipedia.org/wiki/Jornada_(PDA)#Jornada_820
Karpur (Twitter): twitter.com/karpour
Donate a few bucks for some coffee (or some equipment upgrades): ko-fi.com/atkelar
Music:
My Train's A Comin'
Unicorn Heads
(YouTube Audio Library)
After I made the last video, Karpour asked me if I could have a look at one of his Windows CE based devices. An HP Jornada 820, where the screen had some LCD column problem. Every 10 or so pixels, one column was semi-dead, but only in the upper half and also only one or two color channels. To me it was clear that either the connection between the glass panel and the driver was faulty, the driver chip had experienced a meltdown or - unlikely but possible - the LCD controller on the mainboard had some damage.
Karpour said, that he already had a replacement screen in a somewhat broken but compatible model that could be swapped out if needed. I agreed to give it a try, but suggested to skip any pixel-addressing fixes and go for the replacement screen right away, since it may damage the screen permanently if I tried something more... invasive.
Doing some research about the Intel StrongARM chip showed that the CPU is also the display controller. So if that was at fault, I couldn't do much. The CPU is a tight BGA chip and I have no intention of reflowing one of those any time soon.
Turned out to be "just" the display, because swapping the one from the broken model worked like a charm from the get go.
The plastic was about as brittle as it can get... some of the threaded inserts just crumbled away. I used epoxy glue to secure as many of the lose parts as possible.
Not shown in the video, but still an issue: The part that was broken in the damaged model is broken in all 820s it seems: There would be room for two screws to hold it in place, but HP decided that "one is enough" and so the entire tension of the hinge is always tugging on that one screw. Eventually the plastic there WILL break, as the hinge has a counter-spring to hold the display open or closed and it doesn't move easy on that side.
Links:
Wikipedia about the Jornada: en.wikipedia.org/wiki/Jornada_(PDA)#Jornada_820
Karpur (Twitter): twitter.com/karpour
Donate a few bucks for some coffee (or some equipment upgrades): ko-fi.com/atkelar
Music:
My Train's A Comin'
Unicorn Heads
(YouTube Audio Library)
