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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Hi all. Seems a lot of newer monitors (ie pre 2008) have the capability for HDMI but for various reasons this was not included. On the one I have the socket space on the PCB will take both HDMI and DVI-D but lacks the extra parts including a few diodes and resistors. EDIT: Also needs a 24C02 e2prom, this may actually be possible to salvage from a dead TV as a lot of them use a generic VGA/HD mode. Its only for identifying the monitor and its various modes, no harm should come if the code(s) are wrong but it will result in a scrambled picture or "Out of Range".
Registered Member #1548
Joined: Mon Jun 16 2008, 09:22PM
Location: Ohio
Posts: 61
I've always pondered the idea of adding unpopulated headers to get more/different IO options, but never knew how to approach telling the firmware or what have you that there's more options.
Registered Member #1565
Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159
There is also the possibility of needing a different chip-set in the monitor. Like the controller have a bunch of no-connect pins in place of the HDMI pins, and you may have to replace the chip.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
In progress
I found an almost identical populated PCB to compare, so copying the memory is feasible.
EDIT: It appears that a lot of these monitors store the firmware in the same 24C16 chip with the panel settings. I guess this is for low cost, as a lot of more recent monitors use a custom chip with firmware baked in and a variant of JTAG so that they can be written once only as the connector used is shared between multiple IO lines on the panel.
The switch to LED backlights means that many recent screens can't be retrofitted, the panel is model specific and some of them detect the panel's memory chip before even turning on the backlights.
EDIT: Fixed, a lot of the cheap laptop screens with this annoying feature can be unmucked by transplanting the memory from the old cracked panel. It will result in a mass of lines if you don't set it up correctly as the chip now has resolutions that the panel no longer supports.
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Adding HDMI sockets to monitors
