CFL Bulb Repairing Tips- You can Do it
I have replaced one new CFL Bulb on my desk yesterday and it went off suddenly, so I arranged another CFL and it brighten my desk. I need to find out what went wrong with this dead bulb since repairing is one of my professions.
I opened the CFL Bulb with the help of a hacksaw and a flat screw driver. It was easy to open and no damaged to the plastic body.
On visual inspection everything seems ok. On PCB there was no physical damage and burning marks. There was a 68 ohm resistor that act as a fuse and it was tested Ok.
Next, I checked on the surrounding components and circuit with the help of my multimeter and everything seems to be working fine which include the two HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTOR 4202BD and surrounding diodes and resistors.
Till here I did not found the culprit while handling the bulb I visualize black mark on CFL Bulb
I have removed the tube Connection form the PCB for testing the filament continuity.
(Don’t check continuity on the PCB board because the nearby components can misled the reading).
On testing continuity of the filaments …………
( If it shows some low resistance less than 20 Ohm that means filament is ok) so finally I found the culprit but for confirmation I do not have any tube for replacement hence I marked on the remaining body of the bulb as assuming working ok with reference date and kept it by side till the arrangement of working CFL Tube arrived. Thanks!
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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