Circuits & Pinouts
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The LCD screen on my Roland Fantom XR rack synthesizer has gone blank. I managed to get the schematics for the connection to the LCD.
The standard LCD has D0 to D7 pinouts (in addition to the normal VDD, VSS, CS, RES, RW, EN etc).
Can someone help me to identify what V1 to VR is for? Also how does VR work?
Any help is truly much appreciated.... -
Would somebody PLEASE have pinout for any of these 3 chips: Sigma Designs (Coppergate) CG2313QIR-00 (QFN-64) and CG3215QIR-00 (QFN-128), as well as Marvell 88E6020-NNC2 (QFN-64)? I tried everywhere I could think of on the internet without success. You can buy them alright, although not at any of the major distributors - mostly eBay, but I can't find any datasheets or at least pinouts. How one is supposed to design anything without such a basic information like chip pinout? Not even mentioning any more detailed properties... These integrated circuits are used in EOP (Ethernet Over Power) and POE... -
My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?
Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?
My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
I have tried multiple different Dell power adapters. My Dell... -
I have a pair of DJI FPV Goggles v2 that the backlight on one side LCD screen does not light up. Obviously I have tried already to switch screens and ribbon connectors, it's not that. I've inspected things under a microscope and can't see anything wrong with the connector or otherwise.
This is the pinout of the LCD - and I am reading about 35v on LED anode on one side and lower 30V on the non-working side, but this is without the LCDs connected.
Now there's no information on these boards, it's using a proprietary CPU - I've been trying to pinpoint where the backlight...04-30-2024, 10:43 AM -
Hi Guys, here is something I see often when working on LEDs in series wit ha 12V or 24V supply. I may see it other times as well but thinking about it, I only recall this in LED circuits.
What basically happens is my meter reads reverse polarity voltages that seemingly can't exist.
Have a look at this video - this is from a new Youtube channel I started a couple weeks ago.
If you like, watch the whole video through, even let me know what you think of it
, but if you don't have time just play it from 14min 30sec and you will see exactly what...