Update 11 Jan 2019
Update: 9 Jan 2019
1. Depending on the size and thickness of the small fans, the earlier suggestion to install four small 40mm x 10 mm at the bottom of the TV could be quite noisy in operation even when running on two fans. Furthermore, the fans could not cool the CPU although it could cool other components. This was because the CPU was blocked by the input/output connecting box. The CPU was running little lower around 60C.
As the warranty period was over, the 40 mm x 10 mm fans was replaced by two 80 mm x 10 mm fans and installed at the back of the panel as shown by cutting the two holes.
This time, the CPU temperature dropped down to about 41C as shown in this picture
When making the holes at the back panel, it is important to mark the holes to avoid it being in the way of the TV wall mount bracket if it is to be hung to the wall.
As the fans run only at 0,25A each, one can run it from the 5 volt line connected to the USB outlet if one does not have other USB devices that drains current. However, it is always good to have an external 5 Volt power supply as one might connect more devices to the USBs using USB hubs and the 5 volt power supply of TV could be easily overloaded.
A Simple, Cheap and Easy to Install Air Filter to the 80 mm x 10 mm Fans
In a dusty and humid environment like Singapore, there is a need to install and provide air filter for the fans or otherwise, the electronic component boards will break down due to dust accumulation. The alternative is to epoxy coat the circuit board which could be a hassle.
What’s needed
1. A takeaway 500 ml plastic container box
2. A pair of scissor
3. Cutting pen knife or blade
4. Fibrous filter clothes
5. Thin and flexible Plastic tube
Step by Step
Description | Actions | Remarks (Double click to enlarge) |
1. Hole cutting | 1. Measure and cut a hole of about 83 x 83 mm in the centre of the bottom of the container box so that it can be slotted onto the frame of fan easily |  |
2. Bottom Hole Cutting | 1. Cut a I shaped slit on the cover of the container as shown with a width slightly larger than "L", the length btween the box and the wall 2. Heat the cover along the "line " marked as shown using a heat gun or hair drier or an oven by covering up the cover with metal rulers or equivalent, exposing only the "line" of the cover to the heat. this will soften the plastic, allowing the plastic to be bent into a "flap"; 2. Place the fibrous cloth over the cover and the filter box is ready for installation |  |
3. Installing the box | 1. Install the box by sliding it over the fan. Adjust the "flap" so that it will hold the box against the wall as shown. | If the box is correctly cut, it should be easily slotted onto the fan with little sideway movement allowed  |
This filter cloth should last a year or two before next replacement. The CPU temperature has increased by about 1oC from 41oC to 42oC because this filter impeded the air flow.
Update: 9 Jan 2019
1. Depending on the size and thickness of the small fans, the earlier suggestion to install four small 40mm x 10 mm at the bottom of the TV could be quite noisy in operation even when running on two fans. Furthermore, the fans could not cool the CPU although it could cool other components. This was because the CPU was blocked by the input/output connecting box. The CPU was running little lower around 60C.
As the warranty period was over, the 40 mm x 10 mm fans was replaced by two 80 mm x 10 mm fans and installed at the back of the panel as shown by cutting the two holes.
This time, the CPU temperature dropped down to about 41C as shown in this picture
When making the holes at the back panel, it is important to mark the holes to avoid it being in the way of the TV wall mount bracket if it is to be hung to the wall.
As the fans run only at 0,25A each, one can run it from the 5 volt line connected to the USB outlet if one does not have other USB devices that drains current. However, it is always good to have an external 5 Volt power supply as one might connect more devices to the USBs using USB hubs and the 5 volt power supply of TV could be easily overloaded.
Update: 1 Nov 2018
1. The alternative of two big fan blowing at 2 location is to install about 4 to 6 smaller 40 mm panel cooling fan such as these using a longer strip of smaller angle sheet of size 5 x 25 x 1.5 mm to mount the fans as well as to avoid covering up the ventilating holes at the bottom of the TV.
2. Some new MiTV4 (the 9mm thick panel) came with a plastic transparent sheet protecting the shinning aluminum panel at the back of the TV from scratches. Have this sheet removed as soon as possible as it will impede heat dissipation.
3. Try keeping a lot of space between the TV and the back of the wall; keep at least 100 mm clearance and make sure nothing is obstructing the heat flow at the back of the TV.
23 July 2018
Singapore is a tropical country where maximum temperature can reach around 33C for the month of April with average temperature range from 28C to 30C. Electronic equipment such as Xiaomi TV can generate quite a bit of heat and it is good to install external fans to cool the TV should one watches the TV frequently over long hours.
What is the CPU temperature?
The APK used to measure the CPU is from Mugich CPU tools which can be downloaded from Google Store. The operating temperature is around 61-70 C depending on the usage of the TV.
The CPU Thermometer can be downloaded here
How to install the fans?
There are several methods and ways
1. Cut holes at the back of the TV panel and install two fans directly on top of the CPU/PCBs (Printed Circuit Boards)
This will void warranty.
2. Install fan as described by this forumer from Xiaomi BBS
Drilling holes to mount the fan not advisable as it may void warranty
3. Install 2 Nos of cooling fans using this little laptop fan as shown
This article will describe this Method 3 as it will not void the warranty and can be easy installed.
Where to Install the fans?
At the bottom of the Xiaomi TV as shown in this diagram
How to Install the Fans?
1. Tools and materials
a) Electric drill with 3 mm drill
b) 2 nos of Thin angle sheet 12x25x1.5 mm, each about 25cm long
c) Some double sided form tape (to cover the edge of the blower to seal air leaks)
d) 4 Nos of M3 screws, each 30 mm long
e) Soldering iron and solder
f) Hack saw to cut the screw to length
f) Epoxy Glue such as Rapid 5 minute Araldite or equivalent
2. Preparation & Assembly
a) Cut the angle sheet to length and mark exactly on the angle sheet the 2 holes that will replace the 2 screws that hold the TV back panel. Also, mark the location where the fan would be installed so that it can be cleared from obstruction with air blow directly onto the PCB. The location of the 2 fan is roughly as indicated above. Note that they are not installed symmetrically.
b) Drill 2 Nos 3 mm hole on the angle sheet so that the 2 fan assembly together with the angle sheet can be screwed onto the 4 screws that hold the back panel of the TV.
c) Grind or cut the protruded trimmings of the fans so that they can be glued firmly to angle sheet
d) Cut one of the USB plug of left fan furthest from TV’s USB outlet and solder to wires of the wires of right fan, making sure the fans will all blow out air if the wires are soldered correctly.
e) Remove and fix the blower fan assembly to the TV’s back panel as shown
Note:
1. One might have to cut one of the 30 mm long M3 screw to about 27 mm long so that the screw will not be too long to damage other component within the TV
2. Use a torch to shine into the bottom grill to find best position to install the fans so that the air from the blower will not be blocked.
3. To ensure the blower can deliver full power, seal the blower mouth with double sided form tape or blue tag.
4. This method 3 might not cool the CPU temperature directly because the air flow of the main PCB that contain the CPU was blocked by the IO box but one can feel that the back panel is less heaty and blowing air can be feel to blow through the panel, cooling also other components.
5. The 2 fans, each drawing about 0.25 ampere, can be directly connected to 2.0 USB output or a powered USB hub.
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