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Here are pictures of my board. Before doing any work neither the lcd or the backlight was working. 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.
I am unable to find a data sheet on the controller; if a data sheet could be located it should be very easy. You can see picture but still no backlight.
Got to repair a bf a few days ago. I learn quickly but I was following this thread from the start and i replaced the caps.
Selling BITG, BIT, BIT with BITG, BIT, BIT Datasheet PDF of these parts.
Bad caps are still plaguing things inI have the same Samsung b, same problem Ok thanks all for the feedback. I still datasneet take some pics if I ever get some time. Can you read a number on the 16 pin back light controller? Thanks again for the responses.
I have done some testing and I am in a cross roads as to what I should do next. Thank you for all the Help in Advance. I will check again for the fuse, I tried to look in that area but could not see the code f, however that section had a lot of glue on it, so I’ll look closer. 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.
More detail on ‘problem with Backlight’, would datashewt 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 Datashset The image is viewable with a flash light. I did the whole power on and check with a flash light.
Symptoms upon turning it on were no reaction but the rapidly blinking led as well. Bright as daylight and stable too. Problem is that backlights arent working at all. 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.
Originally Posted by jetadm Post As for the backlight, on some of these boards, a fuse F was used for the inverter section. Check to see if it’s open. I had a similar problem with my Samsung B as well.
I hope to get this fixxed nothing like a free 19″ monitor. Anyone have bjt3195g ideas? What part did you change?
It may be covered by white glue. Im not very good in dayasheet to track it to the controller. Here’s the BOM from mouser. Well my picture upload Failed.: Maybe, but measure the resistance of the secondaries of both of the Inverter transformers, they should be very very similar measurements.
I replaced all caps and picofuse but still no backlight. If I disconnect the video cable to the monitor I gain control of the buttons.
Changing all caps on the power board, except the big one, fixed it. Power light is on. Check for proper voltages at the inverter. If these are correct, trace the signals from the connector to the inverter controller.
As for the backlight, on some of these boards, a fuse F was used for the inverter section. Okay So I am a newbie. I didn’t check that they exactly matched the old ones.
BIT G datasheet & applicatoin notes – Datasheet Archive
With the advice of gdement I replaced the bad caps of my Samsung b dtasheet it now works flawlessly! Would the incorrect voltage contribute to this, or is my ccfl likely burned out as well? I think I found the fuse under a glob of rubber stuff. I see the image so something is working right. However now the LCD works but the backlight still does not.