can you identify this part?

Discussion in 'General Electronics Chat' started by timalachowsky, Sep 16, 2012.

  1. timalachowsky

    Thread Starter New Member

    Sep 16, 2012
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    this is part of a LCD TV circuit board. You can see damage where one burned. I would love to repair this. Can anyone identify this part and what it does?
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    looks like a 1800 ohms resistor (R909) but R915 is burned?
     
  3. #12

    Expert

    Nov 30, 2010
    16,247
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    Look at the crater in the solder next to R915! That really got hurt!

    Oh yeah, I agree with Dave. R909 is 1800 ohms.
     
  4. timalachowsky

    Thread Starter New Member

    Sep 16, 2012
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    thanks for your help. I realize that the one I pointed to was not the damaged one. The damaged one is larger than the one identified. How do I find out how many Ohms it is and is this part replaceable?
     
  5. Tealc

    Member

    Jun 30, 2011
    140
    10
    Unless you can read what it says identification will be tricky. A schematic would be handy, or an image of the board from another TV.
     
  6. t06afre

    AAC Fanatic!

    May 11, 2009
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    The resistor may be a goner. But this is collateral damage. The error is in circutry around the resistor
     
  7. timalachowsky

    Thread Starter New Member

    Sep 16, 2012
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    in your opinion, am i better off tossing the circuit board and tv? also, I was able to decipher some numbers on the resistor. It starts with a 2 , has one or two digits, and ends with a 2
     
  8. t06afre

    AAC Fanatic!

    May 11, 2009
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    No I did not say so. So once again. The reason for the resistor is burnt. Is caused by some excessive currents. Caused by another component failing. Resistors do not fail in that way out of the blue. I am only trying to help here
     
  9. tester272001

    New Member

    Aug 24, 2012
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    I've seen some circuts where the resistor is designed to blow in case of over current. I think that picofuses are better but its up to the engineer. What is the model and brand of this TV? maybe I have a schematic or perhaps locate one on the net. BTW you could try to hook a high wattage variable resistor on there and slowly decease the resistance. The variable resistor will burn out the same once the current get high enough.
     
  10. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    Have a look at the other resistors on the pcb, see if you can see if there other resisistors with the same markings, that you can compare it with by measuring its resistance.
     
  11. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    D904 is also blackened on one end, and the terminal with the molten crater blown out is one of the main copper leads into T901 which appears to be a very large transformer from the foot print. Chances are there are opens and/or shorted turns in it as well.

    If this was a lightning strike then there are probably many more hidden problems.
     
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