9 Watt LED Light Bulb Repaired
This LED light bulb was stopped glowing, but why? Then I started to know.The first challenge was how to open this? no screw! but the body of light bulb was consisting of two materials and two kind of polymer then I started to scratch the edge between the bulb and stem of light bulb by a tip of a sharp knife, yes there was glued and with not very strong ones I separated the bulb and the stem.
Inside I found 18 LEDs that were installed on a circled PCB all of them were in series with each other’s the power supply of light bulb was inside of the stem but the output of the power supply white and grey wires was soldered on top of the pcb.
Then I desoldered the wires from the PCB power supply and with the help of a multimeter, I checked the output and yes there was 211-volts DC output which mean the power supply was good.
Since all the LED were installed in series with each other’s, the chances would be high if one of the LEDs were to open circuit, the rest of the LEDs will not light up. A very quick tool for checking the LEDs is a 9-volt battery.
With the attached wires, I then started to check one by one LEDs with the help of a 9-volt battery. All of the LEDs were found to be good except one. Due to a bad LED, the rest of the LEDs were not able to light up. I replaced with a good LED and the bulb was lighted up again.
For your information it is also possible to check the LEDs with the help of multimeter and Buzzer Tool. The cost of this repair was 1/10 of a one American cent.
In CANDONG CHINA, ZONOOPO INTELLIGENT TECHNOLOGIES COMPANY recently invented a new power supply DC-DC IC for LEDs and this IC act as a power supply. The code of this IC is ZON OPO 8290
This is the new generation of LED light bulb with no power supply and is cheaper and lighter. The bridge rectifier rectifies the 220 v AC voltages and 8290 regulate and stabilize the voltage for LEDs the output is 211-volt DC no need decreasing transforms and other actors of SMPS power supply like caps and regulator IC so and so… LEDs of light bulb consume this voltage very softly that is all.! Actually this is a revolution in these kind of led lights.
NOTE 2: When testing the LEDs we have to observe the polarity of battery as well as the polarities of LEDs
NOTE 3: In my country part supplier and repair of LEDs lights is a business that both concentrate in one shop. Buying a new led light more or less is expensive that is why the repair of them is reasonable.
Note 4: Also it is possible even without any new LED repair the light. first we have to remove the opened LED from the board then by soldering the two pols on the PCB board make a connection between two pols and keep the continuity of circuit this cause the light bulb to turns on again this is with no cost method of repair .
This article was prepared for you by Mr Beh from Iran
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