Hi and welcome; It looks to me that your wiring is incorrect. If you look at the face of the LCD, one corner should be different - some kind of notch. That is pin 1. Orient it so that it is in the lower left.
Turn the display over, now the (hidden) notch should be lower right. The right hand connector, lower pin is #1, upper #9. left hand connector lower pin#18, upper #10.
Note that pins 15 and 16 on the LCD are not connected, the backlight (which needs a resistor, try 100 Ohms), is A+ #17 K- #18. Ground is pin 1, +5v is pin 2.
Just hook those wires up, the BL should come on, adjust the BL pot. Adjust the contrast close to one end of it's travel, you should see some black boxes, maybe only on one line. Then go from there.
"The next 4 higher address bytes (OTP Lock Bytes) are used to provide one bit per OTP region to permanently protect each region from programming. The bytes are erased when shipped from Spansion. After an OTP region is programmed, it can be locked to prevent further programming, by programming the related protection bit in the OTP Lock Bytes."
Hi; Dell is big enough to get manufacturers to build "OEM" boards for them. A Google search showed that this is kind of like an iMac for windows.
So not a standard format motherboard, (ATX/MiniATX/ITX etc). On most regular motherboards the BIOS is in a removable chip. It has a label on it, and is square, the label may have a shiny holograph on it.
Anyway what I would do is hold down the F2 key, and power up still holding the key down. This could take 30 seconds or more. It should eventually beep and either take you to the BIOS or complain of a stuck key and say how to get into the BIOS. You might also try the DEL key.
Does it display anything at all? Does it beep on powerup?
#File /etc/udev/rules.d/ols.rules #Rules for Openbench Logix Snifferslogic. Creates a nice link to the ols ATTRS{idVendor}=="04d8", ATTRS{idProduct}=="fc92", MODE="0666", SYMLINK+="OpenLogicSniffer"
As far as high frequency goes - just because you cannot hear it, that doesn't mean it is not damaging you. It may not be the ears that are affected, your eyes and brain are full of liquid.
You have zener Z1 directly across VCC-GND, there should be a current limiting resistor. What value is Z1 (3v3?). I like the way the circuit is mirrored.
