A Dead LCD Projector Was Brought Back To Life
A school nearby sent me this dead LCD projector for repair. This is the second one that I got from the same school. Let the repair begin.
I powered it on but there was no indication of any life in this device so I started to dismantle it looking for the fault to be repaired.
Since it was a power issue, I headed to the power board and hoped for the best.
There were a lot of screws and parts to be taken out but finally I got to the board.
The fuse was open and because of that I headed to the bridge rectifier; sure enough that was shorted as well.
In addition to the bridge rectifier, some of the surrounding components were either shorted or open.
I also found this damage beneath the faulty main capacitor (22 UF/450 volts).
I found a faulty capacitor, shorted bridge rectifier, one Zenner, one diode and a transistor (sorry cannot recall the part number).
All were replaced on that board.
Once all these bad components were replaced and put everything back together, I powered on the LCD project and this was the result.
The customer came and picked up the device and informed later on that the device is working fine but not the best light coming out since the main light bulb is kind of old which something I can do nothing about. I recommend the replacement of that light and see how it goes.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Note: You can check his previous article on A Volkswagen Van Fob Key That Did Not Work Repaired