Question about Akai LCT2701TD Television

1 Answer

Missing capacitors? Hi Bill, It's me again. I'm still trying to fix the MLT166A power supply myself. After staring at it for a while, I noticed that there were a few "empty" places on the circuit board where it seems like capacitors should be. These are namely: - EC3 (100microFarad, 35V) - C54 (470picoFarad, 1000V) - EC12 ( 1000microF, 16V) Isn't it a bit odd that these are missing? Or is it typical that some capacitors are left out for some reason? I'm planning to replace these and see if that will bring the TV back to life. What do you think? Below is a diagram from the manual I got at http://esi.fox-international.com/ It shows capacitor C54, but with letters "NC" under it, instead of "471/1KV" like I think it should. Any ideas about what NC could stand for? As always, your response is greatly appreciated.

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  • mrkrypto13 Jan 16, 2009

    Bill,

    Your answer is a bit confusing... what do you mean by "the requirement was replaced with an opposing cap"? The place where C54 is supposed to be is unoccupied on the circuit board. What about capacitors EC3 and EC12? Should the TV be able to function without them, or should they be replaced?

    Kris

    Diagram showing EC3:


    Diagram showing EC12:



  • mrkrypto13 Jan 17, 2009

    Thank you for the thorough explanation you provided this time. This is the answer I was looking for!

    I believe my rating for your previous response was reflective of how much value I got from it, as it only addressed a small part of my question, and was worded in a very confusing manner.

    The reason why replacing the smps is not a viable option is because they are no longer being manufactured, and are virtually impossible to find. By the way, isn't the point of being a DIY'er to attempt to repair things instead of simply replacing them?


    I definitely appreciate your help and your responses, which overall are useful. Even if I'm not able to successfully complete this repair, I hope this will be useful to someone else who might be attempting this fix and thinking of the same questions.

    Kris


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  • Master
  • 934 Answers

NC in the schematic is a NP (Non-polorized film Capacitor) each C6, C7 and C54 of the schematic above are NC caps as opposed to polorized electrolytic caps... Since the value isn't printed the requirement was replaced with an opposing cap, in this case with a polorized electrolytic instead. It is common to see these design changes and see them still noted in the schematic because they appear on the board. This usually happens when it was too late to correct the board or more costly to redraft the board to eliminate the pos#...
Bill

Posted on Jan 16, 2009

  • William Rayburn
    William Rayburn Jan 16, 2009

    The circuit ends at C53 with the use of two resistors R103 and R132 that's simply an after thought in the design and C54 was eliminated, but probably not before they had sent the thousands of boards to be etched... So it will appear on the schematic but with no value - - because nothing goes there..

    As for EC3 - - Q9 triggers to ground at R29, should be no reason to cap this but I am surprised they didn't make R29 a fuseable resistor to ground. (more reliable).

    EC12 is a redundant EC11, both drawing ground from the backside of the transformer T2D at/near FG2. I have no clue why this was added to the design unless they were looking for a more stable test point denoted by the 8A on the positive side of EC12..



    Now Kris, I'm curious why you've rated my helping you so poorly? My suggestion to you on this was to replace the smps to repair the problem. Unlike most DIY'ers you've chosen to attempt a repair on this module and use it like a classroom project - then when I've answered you rated me as less than useful I don't get it, what part of my help are you finding useless?

    Bill

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