flash firmware onto a v56 lcd panel driver board free sample

The original firmware collection for the V56 Universal LCD TV Controller Driver Board. Instructions on using the firmware can be found in the blog post: "Reuse LCD screens with the V56 Universal Controller".

A controller board is a piece in an electrical circuit that interfaces with a peripheral object by connecting the computer to it. The connection may be with other computer parts, such as the memory controller, or with an external device, like a mouse, that acts as a peripheral controller for an operation of the original device.

The LCD controller board is often called the Analog/Digital (A/D) board. As a type of hardware processor, it allows for various video source inputs to be connected, selected, and displayed on the LCD screen. It does this by converting the different video input signals into a format manageable by the LCD panel.

In conjunction with the LCD controller, the LCD driver is a form of software that is the interface of and dependent on the controller piece. Combined, the two form an LCD controller driver board. As the controller connects the computer to the operating system (OS), the driver facilitates that communication. Though there is typically just one display controller per LCD, there can be added drivers to extend the reach of the drive to further segments of the LCD.

To generalize the process, the LCD controller/driver adjusts the input signal, scaling resolution if needed, and then outputs the signal for the LCD monitor to use. Some of these output interfaces are low-voltage differential signaling (LVDS), SPI, I2C, and Parallel.

In most LCD controller/driver boards, there are two other input/output systems. Both these systems, however, are two-way pathways. One involves controlling and monitoring options, such as controls for brightness, image, and color using the on-screen display (OSD) control panel. The other is for communication via connections like Ethernet, Bluetooth, or IP.

With modern developments, touch screen devices have become much more prominent, and so the touchscreen controller has as well. There are two types of touchscreens: the resistive one that measures pressure and the capacitive one that reads touch. In both of these, there are sensors that detect the touch signal which then transmit the signal data to the controller. The controller then processes the command for the OS.

To delve deeper into the details, consider the previously mentioned input signals. There are a variety of signals that LCD technology processes, such as VGA, HDMI, DVI, and DisplayPort. These computer display standards vary in format and characteristics like aspect ratio, display size, display resolution, color depth, and refresh rate. One of the biggest differences between these standards is their usage of analog signals or digital signals.

In an analog signal, the signal is continuous, but in digital, they are discrete values, typically of 0 and 1. Digital signals have become the most used, as they can more easily carry information and have better quality maintenance; if the analog signal is used and unnecessary information is present, it is impossible to remove it due to the continuous nature of the analog signal. In order to make that switch to digital signals, converters are used to replacethe real numbers of the analog sequence with a set of discrete values.

The VGA, short for video graphic array, standard is one of the most popular analog-based technologies. In recent years, however, the VGA interface has been overshadowed by interfaces like high definition multimedia interfaces, better known as HDMI, which has become a de facto standard for digital signal transmissions.

The HDMI is a combination of digital audio and digital video transmission. There are many HDMI connectors, such as the standard, dual-link, and micro. These connectors are what the input signal travels through to reach the LCD controller and to direct what to display.

The DVI (Digital Visual Interface) offers both analog signals, digital signals, or a combination of the two. Like the HDMI, it has various connector types for different signal types.

When crossing interfaces, we use adapters to bridge the differences between signals. The DVI VGA adapter is relatively inexpensive due to how compatible the two are. The HDMI is also very compatible with the DVI, making the HDMI DVI adapter quite simple.

The VGA to HDMI adapter, however, must overcome greater differences, as they are not naturally as compatible as each were with DVI. Not only are there differences in the analog/digital signals, but also the VGA only uses video interface, whereas the HDMI uses both audio and video. A cable and an adapter are needed to connect the two devices.

And last from the list of examples of input signals is the DisplayPort. It is similar to HDMI in its purpose to replace outdated VGA and DVI as well as its transmission of audio and video through its interface. The DisplayPort does not have as much variation in cables and connectors as the HDMI, with only one cable and two types of connectors. From the DisplayPort, there is a growing technology called the embedded DisplayPort interface, or eDP interface. LCD manufacturers have begun to gravitate towards this interface due to its fewer connections, smaller size, and ability to quickly transmit high quality displays.

Bringing the subject back to LCD controllers, with the various types of computer display standards, the video signal inputs can be a challenge to accommodate and translate for the LCD panel, but with the help of adapters and the growth of these standard types, displays continue to become faster and develop with greater resolutions.

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“PCB800099”, also known as VS-TY2662-V1 is an LCD controller PCB which has entered the market relatively recently. As per usual I have no idea who designed either the board or who wrote its software, but I do know it is based on the Realtek RTD2662 controller, although some may be labelled RTD2660 (which in theory means no HDMI), but if your HDMI input works, it’s an RTD2662. This is just sloppy chip labelling. The RTD266x family represents Realtek’s “TV” lineup, and using this, you notice it.

With my favourite variety (the RM5451 and variants) of D.I.Y. LCD controllers getting long in the tooth, and this also being a Realtek looks like a promising replacement, but having ordered one, I’m not quite sure it is.

It feels more like a TV, less like a Monitor. The RM5451’s firmware mostly manages to stay out of your way, whereas with PCB800099, it’s firmware is in your face. You’ll get a no input “Blue screen”, comprehensive and lengthy OSD popups warning of “No Signal” and whatever input it’s set to.

Because it’s a TV, it assumes that more than one input is in use at a time, and doesn’t auto detect, You’ve got to select the desired input. This is annoying when you’ve got it as a carry around rig using only one input at a time. At least once you a select an input, it remembers it even if you power it off. Thank god.

For the more advanced hacker (i.e. one who’s bought the programmer kit), it’s not as great. Unlike RM5451 which comes with a reliable USB programmer, with hundreds of images for various LCD panels, PCB800099 has only a parallel port programmer with just a handful of binary images, hacked by the vendor to to support a few panels. Some images don’t work at all.

But it’s not all bad. I’ve added support for PCB800099 to my ROVATool application, allowing a USB programmer (More here) which at least makes the programming of these boards a bit easier, but I don’t support editing.

The panel I used here (LP171WP4) is unsupported by the supplied images, but by picking one with the same resolution and LVDS interface type and modifying the embedded EDID blocks I was able to get it working.

It is connector compatible with R.RM5451, including the LVDS interface and backlight. Caveat: backlight enable signal is only driven to +3.3v, which in rare cases could cause issues. The LP171WP4 I’ve got it connected to is a rare example of this, where I’ve had to buffer it because it requires a +5V backlight enable signal.

Overall the hardware solution of the RTD266x is a clear improvement over the RTD2120L + RTD2545 combo of the RM5451/RM5251, but unfortunately in this case, unless you’re happy with the insides of a cheap TV, the same cannot be said for its firmware.

A reader has kindly posted a source snapshot on github (originally provided by another reader) of the firmware, including the changes needed to make it actually compile and program with ROVATool.

I get a lot of emails about this board to the effect of “I just bought one of these – how do I make it work with X?” If you’re thinking of sending one, please don’t. Trying to train up even a single newbie on this subject can burn hours of my day.

I am always keen to hear from people who have already been on the journey of learning about display controllers, and are at an advanced level of understanding, and perhaps even may have something to add to what I have here.

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However, this "new" V56, there is no support for most popular laptop"s screens, like for example: 1280x800_SI6L, 1600x900_DO6L , 1920x1080_DO6L and many more etc. etc. Anyway, there is way to made them work, for example for screen 1280x800_SI6L use firmware "1280x800" and "SI8L" and then, if still not working, in "Service Menu" change LVDS MAP value, that way screen works well as SI6L . The same can be done for other resolutions and LVDS signal types, as described

There are also signals that some new V56 controllers, rejects LAMV56.bin file and do not want to program it. In such case, add letter "R" in file name, like that - LAMV56R.bin, such file will be programmed well. This character "R" add for first time reprogramming only, after successful first time controller reprogram, you can use regular LAMV56.bin files without "R" for next screens.

So, always consider and think twice, before buy any board, choose seller fully supporting latest firmware files for his board, if he is not - simply DO NOT buy, because you will have useless piece of junk.

Programming is very simple, we must choose proper .bin file and copy it to USB pen-drive at root directory, plug pen-drive into USB, then plug power cord, status LED will made some flashes, first slower and at end faster, and software upgrade is done, you will see picture on LCD screen.

Attention: Sometimes, when playing with firmware, if there be power cut/brake during programming and flash will not finish programming, than the board become dead.