Disassembly Analysis: Audi Q3 and A4L Center Display Circuit

This time we will disassemble the displays of two Audi cars, one is the discontinued 5.8-inch display produced by Alpine from the Q3, and I forgot to take pictures before disassembly, so I used a seller’s image from a certain fish. This screen is slightly more expensive, priced at 29 yuan per piece with scratches (no film).

The other one is the 6.5-inch display used in A4L Q5 A5, produced by Panasonic. Compared to the Q3, it is somewhat simpler and cheaper, priced at 14.9 yuan per piece, basically a bargain.

A4L’s components after disassembly are as follows: a rear shell, a front panel frame, a PCB, a display, and several screws.

Interestingly, the backlight is glued to the rear panel, and the LCD screen is separated from the backlight, and it does not have a touch function.

The circuit components on the PCB are mainly concentrated on the front, using a square connector in the lower left corner, where the power, control, and image signals are located.

It uses a Maxim (acquired by ADI) deserializer chip + NXP microcontroller solution, and the power chip is from onsemi brand.

The core of this screen module’s circuit is a MAX9218 from Maxim (acquired by ADI): a 27-bit, 3MHz to 35MHz, DC-balanced, LVDS deserializer chip.

Its function is to decode a single LVDS serial signal into 27-bit parallel data for driving the LCD.

It also includes an NXP P89LPC933H microcontroller for implementing some control logic.

The backlight driver uses TI’s LM3431, a 3-channel constant current LED driver with an integrated boost controller.

The chip printed with 33072 on the left is onsemi’s MC33072 dual-channel amplifier.

ALPHA & OMEGA’s AO4850 dual N-channel enhancement-mode MOSFET.

onsemi’s NSS60601MZ4 low VCE(sat) transistor, NPN, 60V, 6.0A.

CD74HC125 quad buffer with tri-state output.

FDS4935A dual-channel, P-channel MOSFET.

NCV4276A is onsemi’s 400 mA LDO.

Below is the photo of its backlight LCD main ribbon cable.

Using the following 10-pin interface.

The Q3 display looks higher-end, with a plastic panel and touch function.

The display uses AUO’s C065GVN01.

The circuit looks quite new, with key chips coated with a blue substance that seems like a protective coating, which can be scraped off with a blade, resembling a thin film.

This screen uses a TI deserializer chip + Renesas microcontroller solution, with image transmission using TI’s DS90UR916Q 5 – 65 MHz 24-bit color FPD-Link II deserializer, which includes image enhancement function chip.

The microcontroller is Renesas’s R5F3640, with only Japanese documentation available.

There are 2 power chips from Linear Technology on the board, one printed with LTYZ is Linear Technology’s (acquired by ADI) LT1946, a 1.5A switching DC-DC converter with soft-start function.

The other printed with LCHB is Linear Technology’s (acquired by ADI) LT3505, a 1.2A, step-down switching regulator in 3mm × 3mm DFN package.

TP8046 is Toshiba’s MOSFET silicon P/N-Channel MOS type (P-Channel/N-Channel ultra-fast U-MOSIII).

Maxim’s (acquired by ADI) MAX16814 is an integrated, 4-channel, high-brightness LED driver with a high-voltage DC-DC controller.

ROHM’s BD3570 is a single-output LDO regulator high-voltage LDO regulator.

ROHM’s BDxxKA5 series 500mA adjustable/fixed output LDO regulator.

A device with a peculiar shape, suspected to be a voltage regulator. It looks very professional, but I couldn’t find corresponding documentation through ALAO.

ATMEL (acquired by Microchip) ATA6662C LIN transceiver.

The device printed T08 is suspected to be a dual 2-input AND gate, 74HC2G08.

The remaining are some small devices for which I couldn’t find documentation, along with some detailed images of connectors.

In this article, we share our experiences with disassembling the Audi Q3 and A4L display circuits, and we maintain neutrality regarding the views expressed in the article, for the purposes of learning and exchange.

END

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