2023 Author: Philip Bishop | [email protected]. Last modified: 2023-05-24 22:24
- Types of breakdowns and their causes
- Preparation for the repair of LED devices
- LED chandelier design and visual inspection
- Simplest way to test a lamp LED circuit
- LED lamp repair
- Ice lamp circuit
- Eliminating a broken chandelier with a remote control
- Cooling radiators
- Video for repairing chandeliers with controls
Savings and design in lighting have brought cutting-edge technology to nearly every home. Many people change their conventional base chandeliers for economical LED products. Not everyone knows how to repair an LED lamp on their own, especially what parts it consists of inside. How to use the tool in case of breakdown, where to start the whole process. Let's try to understand in detail what are the breakdowns in the devices and how to repair some LED chandeliers with our own hands.
Types of breakdowns and their causes
Typical breakdowns: partial or complete lack of lighting, short blinking or spontaneous shutdown, failure.
Reasons: The temperature has reached above 50 degrees, a break in the contact between the filament itself and the holder, if it is a paid option, and not a lamp, peeling of the contacts on the board.
The LED is burnt out, partially or completely. Cause: Overvoltage in the network, capacitor burned out (breakdown). Usually breakage occurs in cheap board options.
There are additional reasons leading to the failure of the device, namely: a short circuit in the circuit, incorrect connection to the network, non-observance of the device connection diagram during installation.
Poor soldering of circuit contacts, LEDs to the board, poor fastening of wires in the base of the lamps. Poor soldering of conductive elements (wires, tires). Reason: Factory defect. Repair of many LED chandeliers with a control panel is carried out for this very reason.
Preparation for the repair of LED devices
Before repairing the LED light, the fixture must be removed. It will take some tool; thin screwdriver with a flat end, cruciform. If the connection was made using twists, you will need pliers with insulated handles, electrical tape and a multimeter to check the contacts. Tweezers come in handy when working with small parts.
You will need a soldering iron with a thin tip and solder (it is advisable to use a special nozzle). A drill with a 2.5 mm drill., It can also come in handy, disconnect the base of the lamp by drilling out the fasteners. Several thin wires of 10 cm, length.
Attention! It is prohibited to carry out electrical work without a special protected tool!
LED chandelier design and visual inspection
Chandeliers appeared with a remote control not so long ago. Few people are familiar with their device. When repairing LED ceiling
chandeliers, you need to know the design, just in general terms. Let's take a closer look at what it can consist of.
A simple LED chandelier consists of a body, regulator or driver unit. It is used as a voltage rectifier. It contains terminals, or terminal clamps, to which the mains power is connected. Then wires run from the block to the lamps. They can be from one wire, for a regular lamp, up to 12 for the design version of the device.
A more complex version of the product consists of an antenna, a control unit for the lighting itself, a voltage regulator or several
blocks that carry out automatic tuning. Raster luminaires can have several drivers and different types of LED elements and lamps.
Component inspection and repair depends on the specific type of lighting fixture.
Why you need to know or find out the design before you
start repairing an LED chandelier. The reason is simple, you need to determine where the control units are located, inside the chandelier or in
the lighting element itself, the lamp. Here we need the same LED chandelier circuit.
Repairing an LED chandelier working without a remote control is easier. There is nothing complicated in it, they are assembled according to the same type: one or more diodes (a compact bridge is possible), electrolytes (capacitors), a pair of resistances (resistors), and a coil with a winding. This is the simplest scheme without protection, there are many options for them, but now we will analyze the simplest scheme.
After removing the lamp, inspect the board for the presence of visible defects, broken wires, the
absence of such is a good sign.
- Remove the shade or decoration around the lamp, unscrew the lighting elements. Examine the plinth, burnt places indicate poor contact. If there are any, try cleaning them with a knife.
- Repack the terminal blocks, or twists, tighten the screws on all parts. Having found no visible defects, we proceed to inspect the lamps. The version of a block luminaire, where the relays and lamps are next to each other on a large board, is considered as repairing the lamp described below.
- Do-it-yourself LED chandelier repair begins with determining the location of the breakdown or breakage.
Simplest way to test a lamp LED circuit
First, we try to disassemble the lamp itself. There are collapsible models, but sometimes you need to heat it with a construction hairdryer or cut the case. At first, a visual inspection is natural. As a rule, a burnt out LED is different in color or has a burnt leg and the contact pads for soldering the LED are burnt or peeled off.
It is better to supply power with a separate power supply to the lamp. Usually 3.7 volts are supplied to each LED, but there are other ratings of m. Note that depending on the number of LEDs, the voltage changes. To quickly check the LED elements of the ice lamp using improvised methods, you can use any 3-volt battery and paper clips by connecting the contacts. Just observe the polarity of the connection.
We also use a similar verification device when checking the built-in lighting of the luminaire.
Failure of one LED, will shutdown all
All undamaged LEDs in the circuit need to ring the device. But the way is easier, by connecting the lamp to the power supply to carry out simple manipulations
- Alternately close (throw a jumper) the contacts of each LED with tweezers or a wire with stripped and tinned contacts.
- The lamp will light up when you find (close the contacts) on the burned out LED. If this does not happen, see further down the chain.
- Check the board for the cause of burnouts, swelling of capacitors, carefully check the tracks on the regulator board itself. Solder the broken contacts.
You cannot replace the LED with a jumper when there are less than 10 of them in the total circuit, the capacitors will overload, block LEDs will burn out when there are 3 of them in one case. You can identify them by three dark points, inside a yellow or white crystal.
LED lamp repair
It is important to know that the LEDs have polarity and when replacing it, you need to correctly install it on the board. All LEDs are printed soldered, i.e. immersed in tin.
Usually, a soldering hair dryer is used to seal the LED. At home, although it is difficult, it is possible to apply more tin with a soldering iron.
For installation, it is enough to install it on a printed circuit board and warm up its ends with contact pads with a soldering iron. With a powerful soldering, you will have to additionally heat the board from the bottom with a soldering iron. It is important not to overheat the LED element when soldering!
A possible way to repair LED lamps with conductive paste.
Ice lamp circuit
The usual circuit for an inexpensive Chinese 220 volt lamp. Instead of a reliable driver, they assembled a simple transformerless power supply circuit with capacitors and a rectifier.
The mains voltage is first reduced by a non-polar metal film capacitor, straightened, and then smoothed and raised to the desired level. The load current is limited by a conventional SMD resistor, which is located on the PCB with LEDs. When diagnosing and repairing LED lamps of this type, it is important to observe safety precautions, because all elements of the electrical circuit are potentially high voltage. Touching your finger to the current-carrying part of the circuit inadvertently can get an electric shock, and a sliding multimeter probe can short-circuit the wires with unpleasant consequences.
Eliminating a broken chandelier with a remote control
Often, the repair of LED chandeliers must be done due to overheating of the matrix itself. First, unscrew the fasteners and visually inspect the inside of the chandelier. Then they gently try to move the board in place. It is determined whether there is a break in the wires from the control unit, whether the wire is burnt out from overvoltage. If burnt out, solder in place. We check all the details one by one.
Then you will need an original chandelier diagram. Without it, you can only repair the chandelier without a remote control. If there is a remote control unit, replace the batteries with new elements. LED chandeliers with a control panel are often found; here you will need an exact diagram of the chandelier controller to detect a breakdown.
The chandelier control unit is usually tightly sealed in a shell, and manufacturers draw diagrams on it. Only these are wiring diagrams and lighting elements.
There are also blocks with a collapsible body, then the option is simplified. With a non-collapsible unit, use a tester to call the output signal to the lighting elements (LEDs). In the absence of voltage supply, the reason may be a breakdown of the signal receiver. We disassemble it, visually check the contacts and tracks on the board, the integrity of the parts. If the voltage supply goes to one branch of the lighting, then there is a breakdown in the control unit, and not in the signal receiver itself.
The burned-out part can be evaporated and called, for a start, all the resistances (see the diagram) by putting the OM icon on the device. Then the capacitance of the capacitors, since they have designations, polarity and type are also important when checking.
If a discrepancy is found in the denomination, re-solder.
The chandelier control unit is responsible for the intensity and modes of burning of the LED elements. Violation of one of the circuit (in the plafond version of the lamp) does not disable the unit, possibly a fuse has blown.
But still, check the blocks, if there are any melted spots on them, there is, replace it with a new one. If the wires are incorrectly connected, only the parts in the power supply are lit. The regulator unit is protected against excessive loads. It can be called according to the scheme.
Many models of regulators, drivers and power supplies for LED luminaires come with cooling radiators. They have a seat through which the microcircuit or other control element gives off heat. Most lamps have radiators.
Lack of special grease, thermal paste, the cause of overheating of most (up to 15%) boards and blocks. Unscrew and check if it is applied along the plane of the seat.
The thermal grease is applied in a thin layer over the entire surface of the seat, a large amount will only worsen the heat transfer. By screwing an additional thin aluminum plate to the radiator, it is possible to increase the heat transfer, while the installation is carried out without blocking the main air flows passing through it.
As you can see, there is nothing unusual in the repair of LED ceiling chandeliers, no. It's not so difficult to do it yourself. It takes a little patience, a little practice and a tin of knowledge. Of course, the variety of lamps, lamps and all kinds of chandeliers will not make us bored during the renovation process. But in this number of details, the exact diagram of the LED chandelier and, of course, a great desire will help us figure it out.
Video for repairing chandeliers with controls
It is not necessary to buy a new LED, it is easy to fix it, just throw a small jumper between the contacts. Be sure to remove the remnants of the burnt out part of the LED, clean the board from carbon deposits, it conducts electricity.