Failure of the LED lamp is observed, unfortunately, quite common. This is especially true of inexpensive Chinese imitations. The design of such lights is quite simple, so, if you wish, it is possible to repair itself.
If you're handy with a soldering iron, the repair will not be difficult. But how to fix the LED lamp itself, you will learn from this article.
How to Get Started
Let's assume that you already have the necessary tools:
- screwdriver;
- soldering iron with accessories;
- multimeter.
Every repair starts with the diagnosis. So, before you disassemble the lamp - make that a problem in it. To do this, remove it from its socket, and in its place screw the known good lamp. It does not have to be LED light.
If the defective device will work - hence, the problem is still in the LED lamp. Otherwise - look for the fault in the wiring or in the circuit breaker.
Repairs
Recommendations for repair will be common, since different models have their own design features that must be considered. With this in mind, the observations give an algorithm to repair.
Dismantling of the LED module
- The first method: untwisting. Diffusing unit (bulb) in some models can be easily removed by unscrewing. Be careful!
- Second method: separating flask by heating it hairdryer. Upon heating module usually easily separated.
Separate the plate with the LEDs from the rest of the housing. To do this, remove all the screws.
fault location
1. The inspection plates for the presence of soot. If there are no signs of burning, multimeter check the integrity of all the LEDs.
Note: The diodes may include any one chain (sequence) or groups (each group in parallel (Figure 1). In a series connection (define the paths) prozvoniv entire chain multimeter. If you have a faulty LED string, then the resistance will be infinite in both directions. Similarly check each chain groups connected in series. If you find breaking the chain - check each element separately. Replace defective parts exactly the same. If you do not have these LEDs, then you need to change the whole chain of the same semiconductors.
2. If faulty LEDs you can not find - go to the examination board power supply (Fig. 2). Note the electrolytic capacitor (if any). If he vspuchilis - replace it with a new one.
Rang a diode bridge. Possible breakdown of one (usually two) diode. Replace them. In simple circuits (Fig. 3) is usually nothing more lights. In more complicated driver circuits (Fig. 4) may be the weak link of the chip.
Note: Requires a special attachment to the soldering tip for watering chips and LED chips. It provides heating all pins simultaneously. dismantle these elements is extremely difficult without this device.
Repair without soldering
Sometimes possible vypayat dot LEDs using a hair dryer. To do this, gently heat the board from the back side until melted solder (do not overheat the neighboring parts!). If this technique you will quickly refit the new LED with the correct polarity.
If there is a conductive paste on hand, you can try to fix it the conclusions of the LEDs. Contact should get reliable.
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