How Best To Cool Xiaomi TV4

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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.

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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