Question about Sony VAIO VGN-TX850P/B PC Notebook

1 Answer

VGN-TX850P/B Display Problem

Hello:
My Sony TX850P/B will not backlight. The image is barely visible but it's there. Does not seem to be an inverter or fluorescent backlight in this display. LED backlighted? Can this be fixed without replacing the entire display assembly?
Many thanks for your attention.
Cheers,
Frank
Canada

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  • 3 more comments 
  • sicilianu Dec 02, 2007

    Many thanks, Romeet. I think you have pointed the way to a solution. I have opened up the display and see a circuit board on the bottom of the screen. The fusible resistor or inductor must be in this board, but I don't know what it should look like. Any tips on how to identify and test it? I have a multi-meter and some basic tools. Again, thank you. Your advice is very much appreciated.

    Regards,

    Frank

  • sicilianu Dec 02, 2007

    Hi Romeet,

    Again, you have pointed the way. It's midnight and snowing heavily here in Canada, so I'll open the display tomorrow and follow your instructions for testing. May need to send you a photo of my circuit board if I get stuck. Many thanks for your patient advice.

    Best Regards,

    Frank

  • sicilianu Dec 03, 2007

    Hi Romeet,

    I checked the continuity of the two lower components at location 1 and both "beeped" my meter (<30 ohms, test current <0.7mA). Same with the top component in location 2. None of the components are marked "F" or "L". I assume the beeped components are fuses, I checked all the others that looked similar. These must be capacitors and resistors. If there is a blown fuse, then I may have missed it. Only good thing here is that it has stopped snowing outside.

    Thanks and Regards,

    Frank

  • Anonymous Apr 02, 2008

    HI there Romeet, I have a Vaio VGN TX850P . I originally damaged the LED screen and ordered a new one on line. When i installed the new LED the backlight will not come on . You can tell the text is up fine, there is just no light. (I am worried that even though the laptop was off, i needed to remove the battery? I fear this is the case. Would that have blown a fuse?)I went inside to check and make sure the LED cable coming from the main board was seated properly and it appeared to be fine.

    Would it be best to replace the invertor board at the bottom of the LCD if I dont have tools to fix a fuse? If so, where can i purchase this board or do you know a part? After hours of searching i am so happy to have found this blog.. you have no idea.

    Thanks, Susan.

  • ciccino46 May 03, 2008

    I have same problem with my TX850P/B as Susan. Display suddenly went blank. Could see the text up faintly but no back light. Bought a new display online and replaced the old one. Problem persists. Anyone out there know the cause? Thanks. Ciccino.

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Hello Frank,

This is Romeet, id like to try and help you.Most Sony's have a small circuit at the front end of the LCD that effectively works like an Inverter Circuit.How good are you at opening these things up? any electronic repair centre near you? has to be a problem with the fusible resistor or inductor on the circuit i mentioned ( as mostly seen in my experience ).Please let me know.

B.Regds
Romeet

Posted on Dec 01, 2007

  • Romeet Barmeda
    Romeet Barmeda Dec 02, 2007


    Hi Frank,



    Good, your interest in electronics might help.Refer to picture above, your fuse or inductor most probably lies in spot marked 1. A fuse is mostly indicated with an "F" and a number indicating the number of fuse in that circuit,for eg F3 means its the third fuse in a circuit with atleast 2 more somewhere else. If you do not find the fuse in spot one, check for it in spots 2,3,&4 .An Inductor is indicated mostly by an "L" eg L1 or L3 etc etc



    In the picture above, the fuse is the top one indicated by F1 ( closely followed by capacitors C3 & C5 ) i guess the one in your circuit should also be lying in the same spot.Maybe you could try taking a snapshot of it and sending it to me incase it gives you a hard time spotting one?



    Once you have located the fuse / Inductor.. Put your multimeter in "continuity checking" range just like you would do to check a normal fuse.Test the fuse, if it has shorted out, check up the rating of the fuse indicated on its top and get a fuse wire of the same rating and solder it onto the fuse ends.



    Hope this helps, let me know.



    B.Regds

    Romeet

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