China wholesale Lg Mr500 - 4000 in 1 Universal A/C Remote KT3999 – Yangkai

Fault 1: the remote control distance of the remote control is short.

Analysis and maintenance: first of all, it is necessary to judge whether the remote control receiving circuit works normally, and compare it with the remote controller of the same brand and specification. If the remote control receiver is normal, we should focus on two aspects of the remote control: one is whether the 3V voltage of the power input terminal of the integrated block is normal, usually the battery voltage is insufficient, which is the most common reason for the reduction of the remote control’s emission capacity; the other is whether the push transistor and the infrared transmitting tube in the remote control are in good condition, and the able test.

Fault 2: pressing any key only performs certain functions.

Analysis and maintenance: it is usually caused by leakage or short circuit between the interdigital contacts or leads of the buttons on the circuit board that perform certain functions. Clean circuit board and conductive adhesive contact. If the fault can not be eliminated, check whether there is short circuit or leakage in the input and output terminals of the key control of the integrated block.

1. On the back of the general remote control, there is an operation prompt on how to unlock. The specific operation is to press and hold the temperature “+ -” key of the remote control at the same time, and release the hand after 2 seconds to set the unlock and lock.

2. This method is also one of the simplest ways. Take off the battery on the back and install it in a few minutes, then the original factory setting will be restored.