Disassembling the Toyota RAV4 car engine suitable for DIY modification

What we disassembled today is the car computer of Toyota RAV4, which is an older model. It can be bought on a certain fish website for about 100 yuan. In the past, some netizens would modify it to use as a sound system. It can connect an external USB flash drive to play MP3 or video files. Because it has a built-in power amplifier, it can directly drive the speaker. With the audio input, it can be used as a small power amplifier. It also has video AV input, which can be connected to DVD video output and used as a small TV, or connected to a module camera as a monitor. ( For the specific disassembly process, please visit the original post : https://www.eeworld.com.cn/aevfDe1 )

The panel of this car computer is relatively simple, with a knob and 3 buttons on each side. The USB interface needs to be connected using a connecting cable through the interface at the back.

There are many interfaces on the back. I found some information on the Internet and found that after connecting the wires as shown below, it can be used to display the video images of analog surveillance.

The model of this car computer is 86140-0R190, and there are currently no disassembly photos of it on the Internet.

After disassembling, there are 5 PCBs inside. In order to take clean photos, wash them with tap water first.

The 5 PCBs include a main control board, an interface board similar to a coprocessor, a function board with LCD display and touch, and 2 small button and knob boards.

The main control board integrates important circuits such as power supply and power amplifier.

The main controller is Renesas' R8A77405, two Samsung K4B2G1646Q 2G DDR3 memories, Panasonic's RP-SVBC04-like FLASH chip, AKM's AK7756VF audio codec, two JRC4580 amplifiers, ADI's ADV7180 10-bit, 4x oversampling standard definition TV video decoder and some chips whose models cannot be found.

AK7756VF block diagram.

The silkscreen R5F35 should be a 16-bit microcontroller from Renesas.

Lelon electrolytic capacitors are used on the motherboard.

The power amplifier tube should be Sanyo's LV47022, with a maximum power of 48W.

The amplifier uses a cast aluminum heat sink which looks very nice.

On the back of the main controller there is a MXIC MX29LV640 FLASH chip, a TI PCM1681 105dB SNR 8-channel audio DAC with TDM mode, 2 JRC NJM2740 amplifiers and some chips whose models cannot be found.

The coprocessor interface board includes a large chip from Fuji that I cannot find the model of, which may be a microcontroller used as a coprocessor, or a video decoding chip. Next to it is an NXP TEF7000HN automotive low-IF radio front end.

Behind the display is an adapter board connected to the screen, on which there is an Alps UGXZE Bluetooth module, an Allegro A8601 multi-output regulator for LCD displays, an A8502 LED driver and a Rohm BU21024 four-wire resistive touch screen controller.

There is a Bluetooth antenna on the metal partition. Click to see a more beautiful enlarged picture.

2 small buttons and knobs boards, one on each side. 2 encoders, one damping type and one dial type, no chip on the small board.

The 3 boards are arranged as follows.

The display screen is from AUO, model C070VTN01.0.

The display is thick and heavy and feels of good quality.

There is a small fan on the side casing of the amplifier for heat dissipation.

The overall material of this car machine is solid and the workmanship is very good. Unfortunately, Japanese products tend to use Japanese chips. It is sometimes difficult to find data sheets for chips like Fuji, and it is impossible to determine its functions.

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