How can I change wifi adapter
My laptop can not connect to wifi only if my device is so close to it
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You either have a loose antenna connection on the WLAN card (see picture p.32 in the manual) or a broken antenna cable between the WLAN card in the base of the laptop and the WiFi transceivers which are found above the LCD screen in the lid of the laptop, (see picture p.6 in the manual Item #5).
Here is a link to the service manual for the laptop.
It will help you to dis-assemble the laptop so that you can gain access to the WLAN card (where the antennae plug into) and also to the WiFi transceivers in the lid.
Be sure to follow the necessary pre-requisite steps before the procedure to remove any part in the laptop.
It may be prudent to check that the antennae are correctly plugged into the WLAN card first. (see p.31-32)
If the antennae cable(s) is fractured (especially where it passes through the hinge area of the laptop) here is the replacement part number, 776770-001. If you search online using just the number only, you will get results for suppliers of the part. Here is a link to just one supplier. It is not a recommendation to use them, it is shown to give an idea of the cost of the part. There are other suppliers that may suit you better.
If in the unfortunate event that the WLAN card is the problem then here are the WLAN card options and their part numbers, one of which will be used in your laptop.
Ralink RT3290LE 802.11 bgn 1×1 Wi-Fi and Bluetooth 4.0 combo adapter 690020-001
Realtek RTL8188EE 802.11bgn Wi-Fi Adapter for use on all computer models 709848-001
Broadcom BCM43142 802.11 bgn 1x1 Wi-Fi + BT4.0 HMC Combo Adapter 753076-001
If it is determined that the WLAN card is the problem, again just search online using the part number only to get results of suppliers.
Hopefully this is of some help.
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