ASUS RT-AX56U Disassembly (RT-AX56U V2, AX55U)

ASUS RT-AX56U Disassembly (RT-AX56U V2, AX55U)

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The outer packaging is as follows.

华硕AX56U热血版拆机

The product label information on the package shows the specific model number: RT-AX56U V2.

华硕AX56U热血版拆机

Open package.

华硕AX56U热血版拆机

There was a network cable delivered, 26AWG.

华硕AX56U热血版拆机

The power output specification is 12V/1A and the DC connector is the conventional 5.5/2.1. For a low-power CPU like the BCM6755, it is just enough, and the measured standby power of the AX56U is 4.88W.

华硕AX56U热血版拆机

The four antennas are non-removable, the back of the interface is as follows, there is no USB port, there is a WAN port, four LAN ports, the standard 5-port full Gigabit wireless router.

华硕AX56U热血版拆机

The fuselage is printed with the word ASUS WiFi6 in gold look. After I took the picture it turned a light yellow, which is actually a better looking golden color.

华硕AX56U热血版拆机

Fuselage front.

华硕AX56U热血版拆机

Under the label on the bottom of the fuselage, there are no screws.

华硕AX56U执血版拆机

Four feet, only two under the screw, but a screw with a warranty sticker, to tell you the consequences of dismantling the machine at your own expense.

华硕AX56U执血版拆机

After unpacking.

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The motherboard is here.

华硕AX56U热血版拆机

The main board is a large piece, there are two antennas soldered to the main board, there are two detachable, detachable is usually 5GHz.

华硕AX56U热血版拆机

After removing the two screws above the fixed motherboard, you can turn over and look at the back of the motherboard.

华硕AX56U热血版拆机

Pay attention to the upper right corner of the back of the motherboard a chip, silkscreened: FM25S01, is a capacity of 128MB flash memory chip. Capacity in the package box has been indicated, can not be wrong.

华硕AX56U热血版拆机

Remove the back of the heatsink, see two pieces of heat-conductive silicone spacers, the upper pink is to help the switch cooling, the long strip is to help the four amplifier chips cooling.

华硕AX56U热血版拆机

Circuitry on the back of the CPU.

华硕AX56U热血版拆机

Come back to the front of the motherboard and remove the heat sink.

华硕AX56U热血版拆机

After removing the shield, the switch chip, CPU, and memory have heat-conductive silicone pads, and the four amplifiers do not have heat-conductive silicone.

华硕AX56U热血版拆机

SKY85743 has two models, one is the low-power SKY85743-11, the other is the high-power SKY85743-21, at first thought AX56U will use a lower power SKY85743-11, the results are not.

The silicone pad on the switch chip has adhesive, so you can not tear off the silicone pad intact, can not be installed back into use, because this side has been very uneven, not conducive to thermal conductivity, to be replaced with a new gasket, fortunately I have 。。。。

华硕AX56U热血版拆机

Because the motherboard is also not large, I first listed the area of the large chip it, as follows.

华硕AX56U热血版拆机

The model number of the switch chip is RTL8367S, which supports 5-Port full Gigabit. Attribute: 5-Port 1000Base-T Router with SGMII/HSGMII and/or MII/RGMII.

CPU model is Broadcom’s BCM6755, quad-core 1.5GHz, which is ARM-A7 architecture, so the price is cheap. Probably the process is 28nm, so these heat is significantly lower than the 40nm ARM-A9 BCM4709. In terms of performance, certainly not as good as the A53 architecture BCM4906.

The BCM6755 supports HSGMII (interface bandwidth 2.5Gbps), while the BCM6750 only supports RGMII (interface bandwidth 1Gbps).

BCM6755 and RTL8367S good may be connected with HSGMII, so that the bandwidth of the four LAN ports to the CPU is 2.5Gbps, for dual-band only AX1800 rate is very sufficient, if the RGMII is not enough, when the dual LAN ports and dual-band simultaneous transmission to see the total speed will know.

BCM6750 is a tri-core, but also integrated 5 Gigabit network port, but only a wireless chip.

BCM6755 is quad-core, but also integrated 2.4G and 5G dual-band without warp, but only one Gigabit port. May consider the size of the chip area, can only be stuffed into so many transistors.

AX56U WAN port is connected to the BCM6755 CPU, from the motherboard alignment diagram will know.

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There is a memory chip in the lower left corner of the motherboard, the model number is M15T2G16128A, the capacity is 256MB. 256MB of memory is also stated on the box, there is no mistake.

Now look at the external amplifier chip.

华硕AX56U热血版拆机

In the picture above, the model number with “8239S 913924” silkscreened on the square chip is KCT8239S

Screenshot of KCT8539S parameters.

KCT8239S

Refer to this power parameter in WiFi 6 mode: Power@-43 dB +19 dBm.

In WiFi 5 mode refer to this power parameter: Power@-35dB +21.5 dBm.

Here a word about 2.4G WiFi 6 mode, I recommend 2.4G do not open WiFi 6, that is, off 802.11ax, which is good for the stability and compatibility of most smart devices nowadays. I take pictures of the product with the microSD only supports 2.4G, even if placed next to the router will prompt a weak signal or can not find WiFi signal and thus can not connect to the computer to transfer photos, turn off 802.11ax on the use of no problem.

The rectangular chip silkscreened with “4516” is QPF4516B, a 5G FEM chip, which is also used in XDR6060.

QPF4516B parameters are as follows.

POUT = +17 dBm MCS11 HE160 -43 dB Dynamic EVM
POUT = +20 dBm MCS9 VHT160 -40 dB Dynamic EVM
POUT = +23 dBm MCS9 VHT80 -35 dB Dynamic EVM
POUT = +24 dBm MCS7 HT20/40 -30 dB Dynamic EVM
POUT = +27 dBm MCS0 HT20 Spectral Mask Compliance
Optimized for +5 V Operation
33 dB Tx Gain
2 dB Noise Figure
15 dB Rx Gain & 6 dB Bypass Loss
30 dB 2.4 GHz Rejection on Rx Path
Integrated Logarithmic Power Detector

WIFI6 mode only one parameter is in 160MHz bandwidth, +17 dBm, because the BCM6755 only supports 80MHz bandwidth, so the power will be a little higher, estimated at +18 dBm.

There is only one capacitor in the power input circuit, and it is only 100 microfarads.

华硕AX56U热血版拆机

Basically, I’ve finished dismantling it. The Asus firmware version is 3.0.0.4.384_9903-g03b3a15.

The speed measurement is as follows, you can guess which group of results is the Asus AX56U, red or blue box?

Screenshot_2020-10-11-11-37-

The former has 2x2mimo @160MHz and the latter has 4x4mimo @80MHz. both of them are more advanced A53 architecture.

The Asus AX56U is not competitive except for the Asus brand.

Someone left a comment saying that there is an improvement after upgrading the firmware, I went to the official website and had to look for the AX55U model to find the latest firmware down for the AX56U V2, RT-AX55_3.0.0.4_384_9934

RT-AX55_3.0.0.4_384_9934

After upgrading version 384_9934 and restarting the speed test, I measured the speed at the same D-point location three times, and there was no change, it still sucks. I really can’t help QPF4516.

Asus XD4 hardware including amplifier chip model so great may be the same as this AX56U hot blood version, because the XD4 network port only two, yes, only two, so RTL8367S omitted, connected to a tiny single network port RTL8111F can be.

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