LCD TV Repair made easy # 6
Now that we see a great many surface mounted components being used in modern day TVs many repairmen are so intimidated they may forget there are still a great many serviceable components and circuits, Especially the switch mode power supply. Here are a few ebooks I thought were very helpful.Troubleshooting & Repairing LCD TVs by John Preher at http For someone new to electronics the first few pages of this book may be a bit challenging but the majority of this book is easy reading with lots of pictures, diagrams, and useful troubleshooting techniques. Johns book has helpful info about servicing LCD TVs. The most helpful points I learned in this book are the main test points and their approximate voltages. ======================================== How to troubleshoot and repair Switch Mode Power supplies by Jestine Yong at davestv.jestinemichellepow.click2sell.eu This was an expensive ebook but the best I have ever read on switching power supplies.Jestine is good at getting right to the main points you need to understand about troubleshooting this kind of power supply and their associated feedback circuits. Since a majority of the problems I have seen on LCD TVs are related to bad power supplies this is one book I'm glad to have in my collection. Most of the book was easy reading with plenty of pictures and diagrams. ======================================== Testing electronic components and finding unknown resistor values by Jestine Yong. http I have not ...
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@GrantsPassTVRepairs
Good day Dear Bro GPTVR… Actually, I,m Electrician, and expert in wiring and motor control, I can understand easily the chronology and logic sequence in electrical….
But, very difficult to me to understand in electronic fields… I bought more than 3 books about electronic starting from basic…But I fail to understanding the logic sequence in electronic…pls help me..
@MrTonyshit80
The ebooks I mentioned are listed in the info section under my video. I will send you the link by email. I think the two most helpful books are Jestines power supply book and Johns book on LCD TV repair.
How to down load your book…?what should be type , I mean the Title…
I’ve learned from the video that tv parts are a ripoff when bought from these greedy companies.
Thats a dishplayer 7100 mainboard. lol. the powersupply before that is a westinghouse, i have the same TV in the shop now with a dead power supply of the same type. appears the PWM IC is bad. the boost converter hits 388V and hangs there. but no action from the PWM. gets a nice clean 12V to it. so its dead.
Hi, can u show how u test the transformers? thanks
@saint27573 I can’t guess at your problem but often times people get lucky by spotting some bad capacitors and replacing them but they fail to replace the bad capacitors which were not visually defective. I start with the power supply capacitors and move on to the other possible problems like missing voltages and shorted inverter board transistors and transformers.
grantspasstvrepair hi i have a 37 inch lcd tv its a magnavox it started giving me problems with the green light blinking taken long time to come on so i replaced the 2704 capacitor that fixed the problem for about 3 months but now when i push on button there is no blinking light . do you have any idea can you steer me in the right direction . i fixed it when the capacitor was bad and was sucessful but im clueless this time.
Can’t help you there but I hope you figure it out.
Hi, thanks for making the videos. Would you happen to have a pict of a working samsung ln-t3753H with the back cover removed? I think i might be missing a wire and want to compare mine to a working tv. thanks.
Hi Grant, i recently bought a Metex MS-9150 Universal Test device on ebay, the signal generator was not working and there was a nasty smell, one of the 16 leg ic’s was completly melted, it was a removable device but had also destroyed the ic holder, i managed to see the device number and order some more, i’m wondering if it’s something else that caused the chip to meltdown, what should i test before replacing the chip? Power drain on the boards powersupply? voltages to the chip? thanks.
James
I think the most recent book by homer davidson was published around 10 years or so ago.
of course he also wrote articles for electronic servicing magazine, it’s since gone out of business.
@whiskeyify
I have a couple of Homers books but I don’t think he wrote anyhting on the new LCD TVs
Jestines book on switch mode power supplies was very good.
other excellent books are by Homer Davidson.
I don’t think he ever wrote anything on lcd tv’s and he recently passed away. But he had some 40 years in the business and I’ve learned a lot from his books.
Jestine Young is another tech, a young guy in his 30′s but he’s really good, even though i’m an old guy here I’ve learned a lot from him.
@246246
I can’t specifically steer you towards a high current high voltage design, but if you don’t need to high of a current tear apart one of those electric bug lights that fry the bugs. I found a step up transformer that put out 3000 volt AC.
These videos are very insightful. I love the inductors videos. Can you show us the way to build your old very powerful high voltage high amperge transformer?
Great idea.
@EricTheCarGuy I can imagine. Perhaps you should have a call Eric hotline. 2.99 a minute for my best educated guess. LOL
You know this is also true for people and their cars, my email is full of them.
Funny, I have that book.