An LCD TV That Has No Stand By Light Repaired And Maintained
A guy and a friend of mine who works for my brother next door approached me with a question about an LCD TV repair. He said that his father sent this TV to be fixed by another technician and it was not fixed and he asked me to take a look at it and if was not fixable I could have it for free and use it for parts.
This kind of TV is considered to be very old and not worth the repair
but since the customer is a friend of mine I was willing to help out as much as I can.
I powered the TV on and there was no stand by light seen so I checked for output voltages going to the main board and there was none. At first I suspected a power supply issue because I saw a lot of cold soldering joints and solder cracks all over that board so right away I re soldered every pin on that board but sad to say the problem remained.
That is the main board and there lots of things to be checked on that board so before checking there I reflowed the main chip on that board but still no change.
I started to check for shorts on that board and right away, next to the main chip I found lots of capacitors that shorted short to ground and it seems like the main chip was shorted because when I took these capacitors off board, the short remained.
Shorted components were found in that location and I could not do anything about it except replace this faulty board with a working one and so the search started for such board.
After one week of searching in my area I was able to find any old board and as seen in the photo, it was a working one. Sorry I was not able to take a photo of the replacement but I replaced it and it worked just fine.
I called the guy and when he came to the shop he was shocked that the TV was working fine. I connected a source to it and the picture just nice and clear.
At the end of the day, I loaded the TV in my car and took my friend to his house, installed it, connected it to a source and made sure that everything is running within specs.
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.
P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.
Note: You can check his previous article on A Simple Fix To A Dead Welding Machine Repaired and Maintained. Zika Z-200
(42)Dislikes
(0)
12 Comments
Leave a Reply
Parasuraman S
December 7, 2024 at 5:01 pm
Excellent work to save a TV from being dumped and strengthen the friendly relationship! Your gun always finds two targets with one bullet! (LOL)
Waleed Rishmawi
December 9, 2024 at 2:38 pm
Parasuraman: thank you dear friend. my gun always finds two targets with on bullet... never heard that expression said this way but I thank you..LOL. have a blessed day
Albert van Bemmelen
December 7, 2024 at 5:13 pm
Not everything new is also better so it was a good job on fixing the old tv for good friend!
Waleed Rishmawi
December 9, 2024 at 2:39 pm
Albert: it was well worth it and my friend was happy. have a blessed day
Mark
December 7, 2024 at 6:04 pm
Sometimes the only solution is to replace a board. The time, cost and effort to replace individual components can easily outway the cost of an operating board.
Well done!
Waleed Rishmawi
December 9, 2024 at 2:40 pm
Mark: totally agree especially when the main IC was shorted out and no replacement found that was my clear direction to go through in this repair. have a blessed day
Mark J
December 8, 2024 at 4:45 am
Waleed great job once again.
Waleed Rishmawi
December 9, 2024 at 2:40 pm
MarkJ: thanks man. have a blessed day
Yogesh Panchal
December 8, 2024 at 3:30 pm
Good job! Waleed
if possible Buy Thermal camera which helps a lot to figure out the culprit.
Waleed Rishmawi
December 9, 2024 at 2:42 pm
Yogesh: I already invested in a thermal camera and usually used in finding faults in laptop boards and sometimes other boards but i never had the chance to use it on main boards. have a blessed day
Imoudu.O
December 9, 2024 at 4:59 am
I wonder why you didn't suspect the power board since there is no standby light! well thanks for sharing.
Waleed Rishmawi
December 9, 2024 at 2:44 pm
Imoudu: I suspected the power supply at first but since the voltage were coming out after the soldering joint were re soldered, the next step was the main board. have a blessed day