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I am unable to find a data sheet on the controller; if a data sheet could be located it should be very easy. I have done some testing and I am in a cross roads as to what I should do next. I learn quickly but I was following this thread from the start and i replaced the caps. What part did you change? Originally Posted by jetadm Post As for the backlight, on some of these boards, a fuse F was used for the inverter section.
There are other ways but this is maybe the best way for you.
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Power light is on. I didn’t check that they exactly matched the old ones. Thank you every one for all the great knowledge on this thread and on this forum. Thank you for all the Help in Advance. Also try to get the resolution as close to x as possible.
You can see picture but still no backlight.
I hope to get this fixxed nothing like a free 19″ monitor. Can we clear and focused picture of YOUR boards? Problem is that backlights arent working at all. Here are pictures of my board. Okay So I am a newbie. Well my picture upload Failed.: Has been working ever since. Thanks again for the responses. Your board could have unique characteristics not shown in someone else’s photo like a charred resistor or suspicious looking transistor.
I figured out what I didn’t do change three more of the caps and it’s up and running like a new monitor once again. Thanks for yor effort helping me. Datahseet to see if it’s open. I datashee to an electronics shop and the guy looked at the power board and got me some new caps to replace the 3 that were bulging. Can we get clear and focused picture of YOUR boards? I’m going to check it out and see if its tests good. I still will take some pics if I ever get some time.
Badcaps Forums – Samsung b LCD cold start problem (inverter?)
Bright as daylight and stable too. If these are correct, trace the signals from the connector to the inverter controller. Originally Posted by alexanna Post I am unable to find a data sheet on the controller; if a data sheet could be located it should be very easy.
Referencing other people’s pictures doesn’t help us diagnose YOUR problem. I think I found the fuse under a glob of rubber stuff. Well, looks like Last Chance Saloon,before the Backlights become the Main suspects,so I would resolder the Inverter transformers,and all other joints between the secondary and the Lamp sockets,eg the small Blue Caps etc etc.
However now the LCD works but the backlight still does not. The backlights come on and the screen is white. I get the rapid blinking power LED no button functions. Show 40 post s from this thread on one page. I knew the incorrect voltage caps were not a good idea, but I figured it was mostly for the reason that they would burn out very quickly as opposed to not working at all.
Here’s the BOM from mouser. Got to repair a bf a few days ago.
Any idea where else to look? With the advice of gdement I replaced the bad caps of my Samsung b and it now works flawlessly! More detail on ‘problem with Datwsheet, would certainly help,to allow members to maybe help you,eg None work,they work sporadically, they go on and go off BUT Power light stays on etc etc etc.
Originally Posted by Logicsays Post The image is viewable with a flash light. I had a similar problem with my Samsung B as well. Where else to look?
I measured resistance in transformers secondaries onboard and they are similar. It’s a small 3A fuse that’s green in color probably mounted near the caps you just replaced. Maybe, but measure the resistance of the secondaries of both of the Inverter transformers, they should be very very similar measurements. Originally Posted by gypsy Post That fixed it! If I disconnect the video cable to the monitor I gain control of the buttons.
Okay so I got the pictures. I did the whole power on and check with a flash light. Can you read a number on the 16 pin back light controller? I replaced all caps and picofuse but still no backlight. I have Samsung BF and have problem with backlight.