The LCD has several grade quality. Cheap one cannot stand heat and will blackened over time until you can read nothing. The car LCD can last very long. That is the difference between cheap and expensive one, though not necessarily

The display suddenly gone on the 2nd one most likely due to poor joint on ribbon flex cable. The LCD is normally joined to the PCBA using zebra strip or flex ribbon cable. The ribbon cable is connected through zif connector or soldered directly to the PCB using hot bar. Maybe can be fix.

Heat doesn't from the sun. It can be also from the device itself. It can just simply because of poor LCD quality.

There are many light switch that require no N wire from China. Most of the time it is just direct replacement to existing home light switch in Malaysia since there is no N wire to the switch. There are some having problem with the switch because it does not work properly due to certain conditions.

Been thinking whether or not to buy for long time and still thinking I want to use it at:

1) Bathroom switch where wet fingers won't matter
2) Ceiling fan with remote switch. During power trip, the fan will spin at max speed once power is back on unless I switch off the switch on the wall

Just to on and off. Remote control the speed. The touch switch will be defaulted to OFF position when power is back on. Normal mechanical switch will be what it is positioned at . My remote fan, even if it is OFF remotely, will default to full speed upon power on.

Not sure if full speed but definitely not 2nd speed. Mine is Panasonic with 7 speed. I thought can have gentle air flow but end up using speed 1 most of the time. Occasionally 2nd. Higher speed only when I mop the floor

Maybe discontinued already. I repaired the board once because cannot control the speed. Common problem with ceiling fan

Not same as repeater. Repeater extends existing coverage like having to create single powerful AP . Mesh is like having multiple APs in same coverage area.

So, if you have 20 clients, a single AP has to admi all clients from single CPU. Mesh has advantage of multiple processing for same number of clients.

If you have multiple AP and you move from one AP coverage to another, you will get disconnected and re-establish the connection with another AP. In mesh AP, the network is like your cellular phone connection. You will not get disconnected but smoothly handover your connection to another AP in case of LAN.

Yes. TP is the cheapest. However, Asus now release firmware upgrade that allow many of its hardware to form mesh network even though they are not same model. This is very good since you can always ad more unit as needed. Visit Asus website.

I think there is no such thing available at the moment. Maybe in future, I don't know

I don't know much about TP. Did not own on. I'm still using the ori router that came with TM Unifi . However. like you said, it should work.

Repeater and mesh is two different things. Please note that Bridging is different thing altogether. Home consumer APs is not powerful. Thought it say can support so many client, but actually it will significantly bogs down probably after more than 6 clients. So, in repeater configuration, you will have no problem in home setup. If in office environment, it is not wise setup, You will better performance in mesh networking.

Another problem with using in-band wireless (or wireless in general) would be the remote AP will not have full speed if the wireless backhaul speed in low due to distance or obstruction.

You want to have good coverage but the signal is weak and the speed is only 15Mbps. Put another AP and backhaul through wireless. Then you have very good signal but the maximum speed would be still 15Mpbs

People want to control their home in Penang from UK (Ulu Kelang)

Yes. That would be additional devices I believe.

I dunno. My house is as dumb. Maybe people want to switch on and off the light manually and surprised a thief in front for the door

Why not remove both red and yellow backup and try if it trips?

How does the back up work? Automatic when detected no power?

Actually I cannot understand why the Red and Yellow color wire seems to come from source independently. Why not just loop the power from the other one at the switch?

Correct me if I'm wrong. When the backup sense no power, it will trip the MCB to open the normal circuit to DB and provide supply from the backup. Is this correct? Therefore, I think this is what happened.

So, in normal condition, when the switch is toggled and there is no power detected by backup supply the MCB will trip to enable backup to supply the power. Unfortunately, the switch with no L connection will trip the MCB because there is very low current flow in normal OFF condition, just enough to power the switch circuit. However, the backup see it as no power because the switch is considered as in ON condition by the backup. Therefore the MCB tripped.

I gave the thought after I wrote those stupid theory and I think it is not right. The backup should sense the incoming power from TNB I think

he meant swap the ok Aqara with the one that trip. See if this still trip