It is believed that the simplest lighting device is easier to throw. Fortunately, such products are not deficit and their assortment on the market is more than extensive. But if you consider that the LED lamp costs about an order of magnitude more expensive than the analog with the filament, it is more appropriate to try to prolong her life. Is it possible to repair LED lamps, and if so, how? Here with this and understand.
Although this is implied in the repair of any equipment or instruments, but it should be recalled. Before replacing the LED lamp, it is necessary to check the presence of voltage on the contacts of the cartridge.
Not all types of LED lamps( read about them here) are subject to repair. But if the body is dismantled, it is worth a try.
External inspection
First of all it concerns the board on which the whole circuit is assembled. Since external damage to it does not threaten, you need to pay attention to the panel itself and the elements of the chain mounted on it. Even an insignificant temperature deformation of at least one of the details( for example, melting of the capacitor case), especially, burnout on the board with damaged tracks will immediately be noticeable. Since such assemblies are miniaturized, it is better to inspect using a magnifying glass.
Scheme check
They are assembled in different ways, depending on the manufacturer of the LED lamp. Some parts may differ in size, appearance, denomination, location on the board. But all the basic elements are the same: rectifier bridge - limiting( current) resistors and capacitors - the actual lamp( block).
What is recommended to do
Replace C1( C2). First, the capacitor( s) will still have to be evaporated, otherwise do not check. Secondly, this will require a special device. Or a multimeter with such a function. But even in this case, you can make a mistake. For example, when measuring the leakage current.
When setting a new capacitor, you need to pay attention to its operating voltage - not less than 400 V.
Check all diodes ( for breakdown) and resistors( on the breakage of the conductive path).The method is known as a "call".
Ensure the integrity of the LED unit. One of the signs of a malfunction of any of them is the blackout of the card near the device. A more accurate performance check is carried out from a 1.5 V source, in the circuit of which a limiting resistor is turned on 150( ± 50) Ohm. Or 9 V( for example, "Krona"), but already through the resistance of not less than 1 000 Ohm.
The correct LEDs will be lit when they are applied to their feet. If there are many out-of-order n / a devices, it is advisable to replace them with analogs from a piece of LED tape. Only solder them directly to the tracks, that is, from the back side of the board. And it, respectively, turn over before assembling the lamp.
For a person who knows how to handle a soldering iron, multimeter, useful tips is enough. The main elements of the circuits are indicated, so it is not so difficult to find the faulty part. By the way, some LED lamps during the repair can be improved. But this is already a completely different topic.
