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a1990 820-01326 no wifi/bt
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Re: a1990 820-01326 no wifi/bt
Personally do not have experience with this area but let us give it a stab.
The wifi / BT module will often be a stand alone unit that communicates with its master over UART or some similar interface (SPI / I2C / SMBUS). It appears this module uses UART mode with CMOS voltage levels (ie. NOT RS232).
In the schematic there are some multiplexers (MUX) devices shown @ U3640 and U3650. These devices must be enabled with the OE# signal. This is an active LOW signal.
If the pin #8 of each mux is LOW (0 volts), only then will the signals pass through the WIFI / BT module to the PCH (master).
Can you confirm the voltage to ground of the BTUARTMUX_OE_L signal ?
The MUXs have to enable so that the module can be configured & data can flow to / from the WIFI module to the host.
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Re: a1990 820-01326 no wifi/bt
WiFi goes through PCIe, other busses are way too slow.OpenBoardView — https://github.com/OpenBoardView/OpenBoardView
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