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.
Mission accomplished.
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
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Parasuraman S
May 21, 2022 at 12:39 pm
Excellent job! Would have appreciated if numbers/values of the parts replaced were known!
Paris Azis
May 21, 2022 at 1:51 pm
I agree Parasuraman. On a repair it is important to know the types/values of failing parts, especially their manufacturers (whenever possible).
Waleed Rishmawi
May 21, 2022 at 3:09 pm
Paris: totally agree with you and Parasuraman I usually do mention the parts but it seems like I misplaced them somewhere in the shop. I appologize. have a blessed day
Waleed Rishmawi
May 21, 2022 at 3:08 pm
Parasuraman: thanks man. totally agree and I appologize about that. seems like I misplaced them somewhere in the shop. have a blessed day
Paris Azis
May 21, 2022 at 1:53 pm
Good job, Waleed!
Waleed Rishmawi
May 21, 2022 at 3:10 pm
Paris: thanks man. have a blessed day
Albert van Bemmelen
May 21, 2022 at 4:42 pm
Good job! But odd that you do not recall the transistor type you had to replace to fix the power board? This fact would be easy to recover if also the taken photo wasn't so blurry too!
Waleed Rishmawi
May 23, 2022 at 2:10 pm
Albert: thanks. it is not odd but I was just very busy in the shop and I misplaced alot of part numbers and the blurry photo was taken by me but sad to say that camera was dropped many times and it seems like I need a camera replacement soon. have a blessed day
Babu M S
May 22, 2022 at 12:26 am
A new job learned.Thank you very much for sharing.
Waleed Rishmawi
May 23, 2022 at 2:11 pm
Babu: glad to hear it. you are most welcome and have a blessed day
Yogesh Panchal
May 23, 2022 at 10:35 pm
Waleed,
Good Job!
I always take photo of Full PCB save it as a .JPG or.BMP format and editing it in Microsoft Paint by typing the part numbers/Code on it; so that in future if i get the same model again i have the details ready with me for the reference.
Waleed Rishmawi
May 24, 2022 at 2:05 pm
Yogesh: yes that is a good stratgy and I do that most of the time but this time I did not do that because of the heavy load work in the shop. yes I appologize for not giving out the part numbers. have a blessed day