LCD screen with white display repaired. Model: E machines
A mechanic brought this LCD screen to my shop for repair. He said that this LCD screen has white display. He said it was working fine and suddenly, a white display showed up. I was thinking of the worst at that time because white display on the screen it does not happen just like that. Anyways, I decided to open it and see what I can do to help this customer.
It has an external power supply and when checked for power, it was working fine. Here is the power supply
The moment I took the screws off, I was able to see what inside of this LCD screen and I realized also that this LCD screen was sent for repair before it was brought to me.
Take a look inside and see.
I saw this capacitor sitting on the metal of the LCD case. This is a dangerous thing to do. What if the electrical tape came off and then it touched the metal part of the LCD screen? That would short it out and it might cause a big damage inside.
You can also see the black jumper wire that connects two capacitors together. That is a very careless thing to do with it comes to professional repair job. It should not be done like that. The rest of the stuff inside this LCD screen was fine or at least that is what I thought in the first place. Let me explain.
Usually when there is a white display on any LCD screen, first thing I think of is either loose screen cable or damaged one. In this case it has two cables connected to the LCD panel and it seems they were in good condition.
I have checked everything in this LCD screen. The voltage to the inverter IC was there and everything checked fine. I asked myself what if the cables connected to the LCD panel were connected in the wrong way.
I checked closely and in fact, both cables were connected wrong. That explained the white display. The moment, I connected them in the right way look what happened.
It is alive again. Actually there was nothing wrong with it except these two cables connected in the wrong way.
Anyway, it is working fine now and as usual, 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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beh
August 20, 2014 at 11:26 pm
MY FRIEND WALEED
thanks for this sharp and precise repair but what you did for that
flying elector cap
Waleed Rishmawi
August 21, 2014 at 1:54 pm
Beh: of course, it was replaced. thanks
Robert
August 21, 2014 at 4:39 am
Thanks Waleed. The customer probably worked on it himself. What did you do to the capacitors?
Waleed Rishmawi
August 21, 2014 at 1:56 pm
Robert: the customer is a mechanic and does not have this kind of repair skills. the capacitor was replaced with a new one.
Robert
August 22, 2014 at 6:13 am
There are a lot of people that don't have the repair skills but try to repair things themselves.
adeola victor
August 21, 2014 at 10:01 am
good work thanks
Waleed Rishmawi
August 21, 2014 at 1:57 pm
Adeola: you are most welcome.
Humberto
August 22, 2014 at 1:46 am
Good work Waleed, congratulations
Waleed Rishmawi
August 22, 2014 at 6:29 pm
Humberto: thanks
mohamed
February 19, 2015 at 10:31 pm
Good work
John
September 5, 2016 at 3:00 pm
Well done mate, precise instructions and easy to be understood for newbies in electronic. Most of the people would try to repair themselves before checking out the service menu and the schematic diagram. So once the took out everything and they didn't know how to put them back together, and this happened. Never for bad cap, resistors and ic etc. By the way I am not checked an electrician but I do repair laptop motherboard, software error, any IT stuff. That was a nice article to read though....