tft lcd display teardown in stock

I’ve always wanted to see what the latest LCD panels look like inside, and such a chance just presented itself. I got my hands on a broken 15.6″ panel, used in many laptops these days. This particuar one had DP/N number on it, so I assume it was used in a Dell. Let us see how much we can learn looking at the design with limited access to device datasheets.

The chip is labeled 8333(made by  Seiko Instruments Inc) and is generating multiple voltages for the display. The three caps from L201 going to three diodes are parts of the charge pumps  producing positive and negative voltages needed by the panel. (Usually +21,-9,+7 V etc). Input signals come through a 40 pin connector, with four differential pairs running LVDS.

Looks like the connector is carrying (Right to left) Power, GND, 4 diff pairs of LVDS data and what appears to be I2C data to serial EEPROM. The top of the chip has S24C on it and the let side pins are all grounded- typical pinout for an I2C eeprom, where pins 1-3 are address and 4 is GND. Only puzzling part is power pin 8 that seems to go to the connector instead of power plane, and lack any decoupling caps. The EEPROM stores the so called EDIDdata for display identification to the main system. Regular monitors do the same via signals in the VGA cable.

Update 8/5/2012: thanks to the folks at the EEVblog Forum threadfor a lot of insight on how these things work, and their help locating information on some of the parts and the display datasheet(older rev, but very close)

I"d like to get this working with one of the normal TFT drivers - FBTFT? I realise this probably means ripping off and remaking the control board. A daunting, but probably educational and interesting project.

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Question re: "Interestingly enough, the Thunderbolt cable that routes into the display also plugs into a standard Thunderbolt socket on the logic board."

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[quote name="Gatorguy" url="/t/150794/macbook-pro-retina-display-teardown-shows-off-engineering-marvel#post_2130340"]The tone of this article is much more positive than the apparent opinion of the guy running that teardown at iFix-it, Kyle Wiens. He had this to say about it to Wired:

[B]"The Retina MacBook is the least repairable laptop we’ve ever taken apart: Unlike the previous model, the display is fused to the glass, which means replacing the LCD requires buying an expensive display assembly. The RAM is now soldered to the logic board — making future memory upgrades impossible. And the battery is glued to the case, requiring customers to mail their laptop to Apple every so often for a

We previously tore down several Amazon Echo devices, including the 3rd gen Dot, 3rd gen Dot with Clock, the Flex, Echo Dot 4th Gen and the Echo Input. In this teardown, we will look at the new Echo Show 5, 2nd 2021 release, a smart display with Amazon Alexa and a 2 MP camera.

The Echo Show differs from the previous Echo devices that we have torn down as this has a large display and camera in addition to the microphones and speaker on the smaller models.

The lower side is covered in test points. These are not accessible when the device is powered and connected to the LCD, touch screen and camera, so we will have to find a way to access them before we can discover what each test point does.

We could not find the part numbers for the LCD and touch screen without removing them from the front of the plastic case. As they are glued in, and we don"t want to risk damaging the screen, we decided against trying to disassemble that part of the device.

After searching the internet, the closest model we could find was a KD055M39-33TH-A001 with a MIPI interface. The display is advertised as a replacement for the Echo Show 5, so it is either the same display or one that is compatible. The specifications for this display are as follows.

The second option is to scrap the existing CPU PCB and build a new board with a Raspberry Pi 4 compute module. We will need to find a way of interfacing the LCD and touch screen, add an audio ADC and DAC for the microphone and speaker and write some software to run on it, but this would allow us to use other voice assistants like Mycroft. The biggest difficulty with this option at present is getting hold of a Raspberry Pi 4 compute module, as nobody has them in stock.