TFT Repair

  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.

I rescued a 17" Sony SDM-S74 TFT from a WEEE bin. It powered up ok and displayed an image, but the screen went black after about 2 seconds. So I dismantled it and had a look around.


 

 I wanted to know whether it was just a problem with the backlight, or something more complicated involving the display driver.

There are two boards inside - the one on the left provides four HV supplies for the CCFL tubes and logic rails for the other board. The other board takes in VGA and DVI and drives the display panel.

The HV supplies turned off with the display after a couple of seconds, so it was impossible to tell whether it was the problem. or just a side-effect. Shining a torch on it didn't reveal anything. I happened to have a spare CCFL driver left over from a scanner I dismantled a while back, so I hooked it up to one of the tubes. Sure enough the display lit up dimly to reveal a perfect image - proving it to be a fault on the power board.  The CCFL driver can be seen in the centre of the photo:

I looked around the power board. There was an interesting chip labelled BA9741F. I looked it up and found a datasheet. This is fairly unusual - for some reason you usually get one of those annoying sites that just list chip names or, even worse, one that tries to charge you for datasheets. I had a poke around with the scope and found that the voltage on pin 15 of the chip ramped up until the backlight turned off. The datasheet is pretty appalling, but this seems to be to do with some kind of short circuit protection that turns the supply off once its output has been shorted for some period of time.

I  checked the outputs and they were not shorted, so I figured something must be wrong with this short circuit detection. The pin was connected to an external capacitor which it charged up. So I went for a really nasty hack... and replaced the capacitor with a 2.7k resistor!

The display works!

I've been using it for a good few weeks now and it hasn't caught fire, so I think I made the right call. Still feel a bit dirty, though, should probably have got a replacement chip, or otherwise probed deeper into the matter. 

categories [ ]

Warranty Void if Removed | Collected technological projects

I have been exploring for a little bit for any high quality articles or blog posts on this kind of space . Exploring in Yahoo I at last stumbled upon this site. Reading this information So i'm satisfied to convey that I've a very excellent uncanny feeling I discovered exactly what I needed. I such a lot indubitably will make certain to do not forget this web site and give it a glance on a continuing basis. my homepage lasertest

Warranty Void if Removed | Collected technological projects

I simply could not go away your website prior to suggesting thst I really loved the usual info an individual provide oon your guests? Is going to be again regularly to investigat cross-check new posts Feel free to surf to my webpage; Pokerwithrealmoney

Warranty Void if Removed | Collected technological projects

Hi there, I enjoy reading through your article. I like to write a little comment to support you. Also visit my web page - link bandarq

Warranty Void if Removed | Collected technological projects

A motivating discussion is definitely worth comment. I think that you ought to write more on this issue, it might not be a taboo matter but typically people don't talk about such topics. To the next! Cheers!! Here is my web page :: Better Car Insurance - http://beswarm.org/,

Warranty Void if Removed | Collected technological projects

Very quickly this web page wwill be famous among alll blogging and site-building viewers, due tto it's pleasant articles My web-site Leadership Coaching

Warranty Void if Removed | Collected technological projects

Saved as ? favorite, I love your web s?te! Heere is my blog ?ost way to get taller

Warranty Void if Removed | Collected technological projects

In fact when someone doesn't understand afterward its up to other people that they will assist, so here it happens. Stop by my website - situs dominoqq

Warranty Void if Removed | Collected technological projects

I've been surrfing onhline more than 3 hours today, yet I never discovered any interesting article like yours. It's pretty value sufficient for me. In mmy view, if all websitre owners and bloggers made excellent content as yyou did, the internet might be much more helpful than ever before. Chec out my blog post: Shelia

Warranty Void if Removed | Collected technological projects

Gre?t site. Plenty of helpful information here. I'm sending ?t to a few friiends ans also sha?ing ?in delicious. And naturally, thanks to your effort! Here is my s?te :: Web Judi Online

Warranty Void if Removed | Collected technological projects

Hi there all, here every one is sharing these knowledge, thus it's good to read this blog, and I used to go to see this blog everyday. Here is my blog post: AGEN POKER DOMINOQQ ONLINE

Warranty Void if Removed | Collected technological projects

Thank you for any other informative website. Where else could I get that type of information written in such an ideal way? I've a challenge that I'm simply now operating on, and I've been at the glance out for such info. Have a look at my web site girls school student

Warranty Void if Removed | Collected technological projects

I do not. p?ssess any kind of gateways anywhere and was actually told off throu?h my Hv for my reckless mindset, she claimed th?t she ?ould inspect her upcoming virtually brand new purchase to make sure that I can easily 'at the very least' put one in ddss room door. ?lso viisit my page; trave? ?aby gates; http://duderim.dothome.co.kr,

Warranty Void if Removed | Collected technological projects

I always used to read post in news papers but now as I am a user of web therefore from now I am using net for posts, thanks to web. Also visit my website: Situs Sabung Ayam

Warranty Void if Removed | Collected technological projects

Excellent article! We are linking to this particularly great post on our site. Keep up the good writing. My web page lasertest

Warranty Void if Removed | Collected technological projects

Great article. Also visit my webpage - Nama Situs Judi Bola Online Indonesia

Warranty Void if Removed | Collected technological projects

T?ank you for any other excellent article. Where else could anyone ?et that kind of information in such a perfect method of wr?ting? I have a presentation subsequent week, and I am at the search for such info. Check out my website web judi online

Warranty Void if Removed | Collected technological projects

Good day! I know this is kinda off topic however , I'd figured I'd ask. Would you be interested in trading links or maybe guest authoring a blog article or vice-versa? My website addresses a lot of the same subjects as yours and I feel we could greatly benefit from each other. If you happen to be interested feel free to send me an e-mail. I look forward to hearing from you! Fantastic blog by the way! Feel free to visit my homepage ... MP3yi.com

Warranty Void if Removed | Collected technological projects

I like the valuable info you provide in your articles. I'll bookmark your weblog and check again here frequently. I'm quite certain I will learn many new stuff right here! Good luck for the next! Also visit my blog post :: blog/show/44427920-8-situs-resmi-judi-bola-indonesia-bandar-sbobet-terbesar-indonesia

Warranty Void if Removed | Collected technological projects

Hi! I'm at work surfing around your blog from my new iphone! Just wanted to say I love reading your blog and look forward to all your posts! Carry on the outstanding work! Also visit my web blog ... film semi thailand

Warranty Void if Removed | Collected technological projects

Incredible points. Great arguments. Keep up the great work. Stop by my web-site: lowest priced

Warranty Void if Removed | Collected technological projects

You made some good points there. I checked on the web to find out more about the issue and found most individuals will go along with your views on this website. my web blog :: online gambling

Warranty Void if Removed | Collected technological projects

Great post. I'm going through a few of these issues as well.. my web site; daftar casino online terpercaya

Warranty Void if Removed | Collected technological projects

I read this post fully concerning the resemblance of hottest and earlier technologies, it's awesome article. my web blog minecraft

Warranty Void if Removed | Collected technological projects

Thanks for sharing such a good idea, piece of writing is fastidious, thats why i have read it fully Website: http://herb24.space

Warranty Void if Removed | Collected technological projects

Major celllular operators confronted saturation and elevated spending on advertising and marketing and developmenht of VAS providers. My website; lords mobile hack no human verification

Warranty Void if Removed | Collected technological projects

It's awesome in support of me to have a site, which is useful for my experience. thanks admin my web site - Situs Domino

Warranty Void if Removed | Collected technological projects

Hmm is anyone else having problems with the images on this blog loading? I'm trying to determine if its a problem on my end or if it's the blog. Any feedback would be greatly appreciated. Look at my webpage :: JUDI POKER (paguncarry.wordpress.com)

Warranty Void if Removed | Collected technological projects

I am no longer sure where you are getting your information, but good topic. I must spend some time learning more or working out more. Thanks for magnificent information I was searching for this info for my mission. Feel free to surf to my website: lasertest

Warranty Void if Removed | Collected technological projects

Thanks for some other informative web site. The place else could I get that type of info written in such an ideal method? I've a challenge that I am simply now operating on, and I have been on the look out for such info. Take a look at my blog post - rollex 11

Warranty Void if Removed | Collected technological projects

I was able to find good advice from your blog articles. my blog ... Ian Willis (fretfulspeck4915.Sosblogs.com)

Warranty Void if Removed | Collected technological projects

Because charge cards are overlooked, few individuals understand the reputation them which they play with. You can even become a fish if you imagine it to be in case you play Bratz Fish Tank. Today buy r4i card is marketed by many branded companies showing through the world. Look at my homepage ... download mods for minecraft pc

Warranty Void if Removed | Collected technological projects

Howdy! Quick question that's totally off topic. Do you know how to maake your site mohile friendly? My weblog looks weird when browsing from my apple iphone. I'm trying to find a theme or plugin tat might be able to resolve this issue. If you have any recommendations, please share. Thank you! my web page; jerseys make awesome

Warranty Void if Removed | Collected technological projects

wonderful put up, very informative. I'm wondering why the opposite specialists of this sector do not notice this. You must proceed your writing. I'm sure, you have a huge readers' base already! Look at my webpage ... Agen Poker Di Indonesia

Warranty Void if Removed | Collected technological projects

Following is a brand new game on Facebook games called Everwing that does not ask that you download and install in your cell phone. My web site ... everwing tips

Warranty Void if Removed | Collected technological projects

Howdy! I know this is kinda off topic but I was wondering which blog platfform are you using for this site? I'm getting tired of Wordpress because I've haad issues with hackwrs and I'm looking at options for anotger platform. I would be great if you could point me in the direction of a god platform. Feel free to surf to my webpage - BTC Casino online

Warranty Void if Removed | Collected technological projects

Stunning story there. What occurred after? Take care! my webpage; Daftar Sbobet Online Terpercaya

Warranty Void if Removed | Collected technological projects

I'd like to thank you for the efforts you've put in penning this website. I'm hoping to check out the same high-grade blog posts by you in the future as well. In fact, your creative writing abilities has inspired me to get my own site now ;) My site - water powered car kits

Empty congress and as the

Empty congress and as the shopping trinity close for a minute as you can see right now my clothes are not meant for an interview here at Macy’s during black Friday going to shoppers uh… www.themenshopping.com

Warranty Void if Removed | Collected technological projects

I'm not sure why but this website is loading extremely slow for me. Is anyone else having this issue or is it a issue on my end? I'll check back later on and see if the problem still exists. Review my page lasertest

Warranty Void if Removed | Collected technological projects

I always used to study piece of writing in news papers but now as I am a user of internet therefore from now I am using net for content, thanks to web. my web-site; Oxyselect Pink Reviews

Warranty Void if Removed | Collected technological projects

I am so happy to read this. This is the type of manual that needs to be given and not the random misinformation that's at the other blogs. Appreciate your sharing this greatest doc. Check out my webpage - jerseys cheers users

Warranty Void if Removed | Collected technological projects

There are basically millions of game, video, movies and music to choose from. The properties of the files in the resource list are displayed. When bad times arrive at our doorstep and our modern electrical utility systems are no longer available and functioning we simply can not rely upon the moon or flashlights to illuminate our yards. Here is my weblog - download lagu gratis

Warranty Void if Removed | Collected technological projects

Pretty nice post. I simply stumbled upon your weblog and wanted to mention that I've really loved surfing around your weblog posts. In any case I will be subscribing for your rss feed and I hope you write once more very soon! Here is my blog :: t shirt maker

Warranty Void if Removed | Collected technological projects

An intrigiing discussion is definitely worth comment. I think that you ought to write more about this topic, it may not be a taboo matter but usually people do not speak about such subjects. To the next! All the best!! My web-site make jewelry for a living

Warranty Void if Removed | Collected technological projects

When I initially left a comment I appear to have clicked the -Notify me when new comments are added- checkbox and from now on each time a comment is added I recieve 4 emails with the exact same comment. Perhaps there is an easy method you can remove me from that service? Thank you! Feel free to surf to my web blog: stud.hut1.ru; Latashia,

Warranty Void if Removed | Collected technological projects

This is my first time pay a quick visit at here and i am genuinely pleassant to read all at one place. My webpage :: Data Singa Pengeluaran

Warranty Void if Removed | Collected technological projects

Hoedy just wanted to give you a quick heads up. The words in your content seem to be running off the scfeen in Ie. I'm not sure if this is a format isssue or something to ddo with browser compatibilkty but I figured I'd post to let you know. The design and style look grewt though! Hope you gett the problem fixed soon. Thanks My webpage Bitcoin Casino Online

Warranty Void if Removed | Collected technological projects

Excellent post. I was checking constantly this blog and I'm impressed!Extreemely useful information particularly the last part :) I care for such information much. I was seeking this particular information for a long time. Thank you aand good luck. my blog www bovada

Warranty Void if Removed | Collected technological projects

Undeniably consider that that you said. Your favorite reason seemed to be at the net the simplest thing to be aware of. I say to you, I certainly get irked even as folks consider issues that they plainly do not know about. You controlled to hit the nail upon the highest and also outlined out the entire thing without having side effect , folks can take a signal. Will likely be back to get more. Thanks Here is my web site ... QQDewa

Warranty Void if Removed | Collected technological projects

I would like to thank you for the efforts you've put in writing this website. I am hoping to see the same high-grade blog posts from you later on as well. In truth, your creative writing abilities has motivated me to get my very own website now ;) Have a look at my web-site: Campfire Cast Iron Cooking Recipes