LCD inverter
in [Repair]
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From: Michael Kennedy on 11 Dec 2009 13:37 Hi everyone. I recently got a 22" LCD monitor which has a bad backlight inverter.. It is a Phillips LC200WX1 which is part of an all in one PC. This monitor has 5 CCFL tubes in it. The inverter itself doesn't have a blown fuse and it was making the backlight flash enough to read the screen.. But now it is only making some noise.. Hi pitch vibration from the transformers. Anyhow.. This thing has no visible electrolytics on it to change... Its all SMD The model number on the inverter is KLS-LC200-F Anyway..I've fixed a few simple inverters but I was thinking it might be more simple to just replace the inverter with a couple of simple CCFL inverters. Any thoughts or suggestions? Thanks, Mike
From: whit3rd on 11 Dec 2009 16:58 On Dec 11, 10:37 am, "Michael Kennedy" <m...(a)nospam.com> wrote: > Hi everyone. I recently got a 22" LCD monitor which has a bad backlight > inverter.. It is a Phillips LC200WX1 which is part of an all in one PC. This > monitor has 5 CCFL tubes in it. The inverter itself doesn't have a blown > fuse and it was making the backlight flash enough to read the screen.. But > now it is only making some noise.. Hi pitch vibration from the transformers. Unfortunately, bad inverters can ruin backlight tubes. Your best bet is to get the manufacturer to rebuild it, because it might take backlight, inverter AND/OR other parts to complete a repair. "generic" inverters sound like a good idea, but they aren't likely to be dimmable or turn off for energy savings or do the other dozen things the original item was responsible for.
From: Franc Zabkar on 12 Dec 2009 00:39 On Sat, 12 Dec 2009 03:37:42 +0900, "Michael Kennedy" <mike(a)nospam.com> put finger to keyboard and composed: >Hi everyone. I recently got a 22" LCD monitor which has a bad backlight >inverter.. It is a Phillips LC200WX1 which is part of an all in one PC. This >monitor has 5 CCFL tubes in it. The inverter itself doesn't have a blown >fuse and it was making the backlight flash enough to read the screen.. But >now it is only making some noise.. Hi pitch vibration from the transformers. > >Anyhow.. This thing has no visible electrolytics on it to change... Its all >SMD The model number on the inverter is KLS-LC200-F FWIW, here are photos of a KLS-LC200-M inverter for a Toshiba 20HLV86 LCD TV: http://photos.discount-merchant.com/photos/1001/photos.php?itemid=1003800 There is one available here for US$35: http://www.discount-merchant.com/ProductDetails.asp?ProductCode=1003800&CartID=0 Google gives plenty of hits for the M version. DMTECH WQ20XT Inverter - KLS-LC200-M Rev.11 - 6632L-0257A - LC200WX1: http://flattvparts.co.uk/index.php?main_page=product_info&products_id=1708 FWIW, here is a multipart service manual for a Philips 50 & 60 inch projection DLP HD5 color TV chassis # CT2.0U RA: http://www.eserviceinfo.com/downloadsm/31430/Philips_CT2.0U%20RA.html It contains a reference to "LC200WX1-SL01". - Franc Zabkar -- Please remove one 'i' from my address when replying by email.
From: Michael Kennedy on 12 Dec 2009 03:17 "whit3rd" <whit3rd(a)gmail.com> wrote in message news:3105792b-8849-44c6-a00a-5545ec2a603d(a)n13g2000vbe.googlegroups.com... On Dec 11, 10:37 am, "Michael Kennedy" <m...(a)nospam.com> wrote: > Hi everyone. I recently got a 22" LCD monitor which has a bad backlight > inverter.. It is a Phillips LC200WX1 which is part of an all in one PC. > This > monitor has 5 CCFL tubes in it. The inverter itself doesn't have a blown > fuse and it was making the backlight flash enough to read the screen.. But > now it is only making some noise.. Hi pitch vibration from the > transformers. Unfortunately, bad inverters can ruin backlight tubes. Your best bet is to get the manufacturer to rebuild it, because it might take backlight, inverter AND/OR other parts to complete a repair. "generic" inverters sound like a good idea, but they aren't likely to be dimmable or turn off for energy savings or do the other dozen things the original item was responsible for. Well I did attempt to power it with 5 laptop inverters... They were not strong enough to run the CCFLs and they were all a bit dim and after a few minutes one inverter started to overheat. Anyhow I think the CCFLs are good. Thanks, Mike
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