I have an LCD screen, but the motherboard is too bad to be made, how can I evalu - Page 1
Forum section: electronics / repair

author: hummerjanne
author_rank: Regular Contributor
timestamp: October 08, 2023, 04:19:29 pm
content: I have an LCD screen, but the motherboard is too bad to be made, how can I evaluate this screen?

author: t1d
author_rank: Super Contributor
timestamp: October 08, 2023, 07:15:35 pm
content: Hi, hummerjanne. I see that you have a low number of post. I take it that you are a new member. Welcome.I am posting to let you know that this forum, like many others, has it own set of unwritten rules. And, that the way you have posted your question is not likely to get any replies, at all.You need to give us a great deal of information...- The make/model/year of the screen and what is it used for? Computer display, TV, etc?- Though the motherboard is defective, please provide us with its schematic, if you can find it. Well, all of the schematics... The power supply, etc. The service manual for the screen would be very helpful, as well.- Post lots of pictures of the inside and outside of the display. Particularly of any damaged areas.- What testing have you already tried, if any, and the results.- What do you intend to use the screen for? Do you want to repair it, or salvage its parts? Testing for different uses will be very different.- What are your electronics skills, level of expertise and tools available to you?This is just a rough start to the information that you will need to research, yourself, and provide to us, in order to get started. Be prepared to do much more research and learning.We are excited to help you and look forward to hearing from you very soon.

author: hummerjanne
author_rank: Regular Contributor
timestamp: October 09, 2023, 03:52:59 pm
content: This is the card in my hand, but its current state is not like the one in the photo.

author: hummerjanne
author_rank: Regular Contributor
timestamp: October 09, 2023, 04:02:51 pm
content: this is the diagram

author: t1d
author_rank: Super Contributor
timestamp: October 10, 2023, 04:21:39 am
content: Quote from: t1d on October 08, 2023, 07:15:35 pmHello, hummerjanne,Thank you for the pictures and schematics. The schematics are usually the most difficult to find. This is a good beginning!You will notice that I said that we need a great deal of information, to be able to help you. You need to go back through the list and answer each and every question, to the best of your knowledge. Your answers will probably lead to more questions. You should be prepared to answer them.The pictures of the similar screen will be helpful! Did you take pictures of a second screen that you have in hand, or are these pictures just from the internet? The reason I ask is that, after we have more information, we may be able to tell you how to use the good screen to test the bad one.We look forward to you providing the additional information and helping you find solutions.

author: DavidAlfa
author_rank: Super Contributor
timestamp: October 10, 2023, 11:34:13 am
content: This is a pretty old monitor or TV... has CCFL lamps, might have degraded beyond their lifespan.You can't test a LCD without a driving board!What's the problem with this display?