Question about Akai PT4298HD Rear Projection Television

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I have a PT4298 TV and am trying to replace the "pico fuses". Are the pico fuse the ones labeled RFZ53 and RFZ50 (Is this just the board reference designators?) and where can I purchase them? They look like resistors with color bands on them. Both of them have the same color bands so I'm not sure if they are different fuses or the same ones. Also, I measured across them and they both read 150 Ohms. Does that mean that they are both bad? The board is a P55A AA41-00601B (CG Amp PCB).

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  • mark yamauchi Mar 14, 2011

    The only labeling is the RFZ50 and RFZ53. They are connected to the STK392-040 (Convergence IC) VCC and -VCC pins so I am assuming those are the right "fusible resistors". How do I know what the amperage rating is the will blow these fuses and also where can I purchase them? Also, if they are measuring 150 ohms does that mean they are still good (since they're not open)? Thanks in advance.

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  • Master
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Pico fuses are resistor with a very low resistance value almost like shorted when read on a multimeter.this resistors acts like a fuse they blow when a short circuit occurs.they are also called fusible resistors...a defective pico resistors are open in resistance reading.they do not have any reading..150 ohms reading is not bad ..usually fusible resistors are installed on the positive supply of every components to avoid fire when a circuit malfunction...fuses are on the the board are labeled F with corresponding amperage rating!
good luck hope this helps!

Posted on Mar 14, 2011

  • Danilo Baraquiel
    Danilo Baraquiel Mar 14, 2011

    your right sir those resistor are still good since they are not open you can inquire from this link to buy a fusible resistor.or you may buy at an electronics spareparts supply store near you..

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1 Answer

Replaced Convergence chips, same problem


This set has pico fuses on convergence board and also on G power board, there should be 2 5 amp pico fuses on power board.

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Steve
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