1. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    U817 is a simple 5 to 3.3v regulator, if you have no output voltage, then you will probably also not have the 5v input to the U817.
    Maybe you used a bad cap, or placed one in the wrong direction.
     
  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    And as for the,
    0100040000F
    00080000
    Feeeeeeeeee etc. issue

    I have not really a clue what it could be.
    I'm thinking of a memory problem or a issue with the fpga chip nevertheless it's just a idea what it could be and not really have a idea how to find it out without the possibility to jtag the board.
    I will tomorrow do a attempt to jtag/I2c the board, but since there is nothing to find on the inet about it, I have my doubts if it can be done.
     
  3. tomeek.p

    tomeek.p Member

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    I change all tht caps. In this moment ethernet port the diodes started to show the light. RS nothing show.
     
  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Yes, it is known that caps have a limited life, especially the cheaper ones.
    But the main question is whether you still have all voltages at the correct value , and a little strange that you do not get a terminal output now.
    Therefore the main question is now, is it improved by the cap replacement, or worsened.
     
  5. tomeek.p

    tomeek.p Member

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    The voltages on the selected elements are a bit better. Only I still do not have the correct voltage at U817.
     
  6. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    U817, Do you have the 5v input to it, but not the 3.3v output.
    Or do you not have the 5v to it which is more logic.

    As for the 5v, I think that it's delivered from the U825, maybe the cap nearby has a issue.
     
  7. tomeek.p

    tomeek.p Member

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    Ok, find problem with U825 regulator in this moment have corectly voltage in u817. Nothing has changed in the RS.
     
    Last edited: Mar 28, 2018
  8. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Maybe it tells something if you check it with ohm measurements, see the new post about it.

    Nevertheless, I've just had a duo2 case which were also death, only the led in front.
    Rs232 terminal output gave nothing.
    All voltages were present, and the ohms values were healthy.
    With this nowlidge I have removed the nand chip, which gave in my reader more than then bad blocks as also a blocked 0 sector.
    After I had programmed a new nand chip and placed on the board it came back to life.

    So, be aware that the nand chip is programmed without errors and fine soldered.
    It's a bit pity that there is no bbs bcm7424 file to (I2c) jtag the box, it has the I2c pins but without the bbs cpu file it's useless.
    I have tried all my bbs files to see if I could make a connection to the box, even tried to reprogram one, but till now not succeeded.
    When it has the jtag option, then it's easy to check the box, memory and nand chip.
     
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  9. tomeek.p

    tomeek.p Member

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    Found low ohm. This fault value marked in red.
     

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  10. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    These are I think vcc inputs and most likely from the 12v circuit, thinking of the same circuit as for the 12v input to the u705/u825/u803
    If you have these ohm measurements without the psu connected to the motherboard, then it could be some kind of problem between the 12v circuit to these two if the others have the correct value.
    But to be sure if these all are connected to the 12v circuit I need to check it on my box which I not earlier can do than tomorrow evening.
     
  11. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    just as I thought, both inputs are directly connected from the 12v circuit, so there is no reason why you measure there another ohm value.
    With the psu connected I get here 1658 ohms, 2511 ohms without the psu connected.
     
  12. tomeek.p

    tomeek.p Member

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    I exchanged another NAND. I programmed it with openATV batch. Unfortunately, the tuner does not start. Does he not show the address from memory in the RS log? It's about this address 00080000. Maybe it has invalid env and mac data?

    Code:
    mtd0: 07600000 00020000 "rootfs"
    mtd1: 00400000 00020000 "kernel"
    mtd2: 00400000 00020000 "boot"
    mtd3: 00100000 00020000 "cfe"
    mtd4: 00080000 00020000 "mac"    <- This value
    mtd5: 00080000 00020000 "env"    <- This value
    mtd6: 00100000 00020000 "nvm"
     
  13. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    If you have programmed the nand flash chip with the programmer and get this results then it may wiser to flash the box again on the normal way with usb if it can.
    If you already have flashed the box after the programming with a nand flash programmer then it's maybe wiser to see if it improves when you use the latest OpenPli.
     
  14. tomeek.p

    tomeek.p Member

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    No I have this same problem.

    0100040000F
    00080000
    Feeeeeeeeee etc. issue
     
  15. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    I don't think that it can be caused when there is a issue with the mac address, since it is not related to a bootloader or nand flash chip, I'm rather think it could be the fpga chip, or a issue with a memory block or the whole memory doesn't work due a missing main voltages.

    BCM74250012

    M0
    M1
    could be meaning Memory row 0/1

    Nevertheless in your case it goes wrong after the M1 which should be related to the fpga chip if the 01CZL2 is related to it.
    01CZL2=1
    LLMB=0000C000
    BP=02000000
    L2Cfg=1E7AD627
    L2Buf=77707711
    BrCfg=F01C200E
    BrMod=02800801
    BrZp0=44000000
    BrZp1=00002000
    #@

    But still, it's hard to say what it could be when all the voltages and ohm values are correct.
    But also, because I have never had this issue in repair it's not easy to say what it could be.
     
  16. tomzza

    tomzza New Member

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    Hello i have same problem only white light on i chance all caps power and motherboard, because some were bad. I missing voltage 3.3V L802 I measured
    U806 pins
    left to right 7.61k-Gnd-2495ohm-Gnd 4-3-2-1 input pin 2 = 12.2V Out 7-8 =0.0V
    60k-20.5k-0k-0k 5-6-7-8
    I remote u806 still pins 7-8 gnd
    I mesure p301 left to rigt Gnd--10k-10k-Gnd without u806


    edit
     

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    Last edited: Jul 13, 2018
  17. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    This U806 ic must have an output of 1877 ohms or higher and it supplies at least the ICs U807 / U818 and the U601 maxim aud / vid chip, Actel chip and the nand flash chip

    If one of these has a problem between the 3.3v and earth, this may be the cause.
    However, it is not unlikely that this voltage is also used for the CPU.

    I would first check the U807 / U818 and nand flash chip.
    A defective / short-circuited nand flash chip is possible, also these pins 3.3v/Gnd are close together.
     
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  18. tomzza

    tomzza New Member

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    Hello again
    U818 left to right
    gnd?-4.24k-271ohm-x
    x -20.5k-0.4ohm-63k


    U807
    gnd?-gnd why?-1.19k-nothing
    x -20.5k-0.4ohm-40.1k
    i remote U806 still outs pins connection to the ground (U806)
     
    Last edited: Jul 14, 2018
  19. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Saturday I can check these two measurements, but at least the inputs from these two may be to ground, because you say you have a short-circuited to ground from the U806 output which is the input voltage for the U807 / U818 etc.
     
  20. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    U818 left to right
    gnd?-4.24k-271ohm-x
    Gnd - 4.30k - 306 ohm - x

    x -20.5k-0.4ohm-63k
    x - 20.14k - 1877 ohm - slow up/down to 65k

    U807
    gnd?-gnd why?-1.19k-x
    Gnd - Gnd - 1227 ohm - x


    x -20.5k-0.4ohm-40.1k
    x - 20.04k - 1877 ohm - down to 78k or lower

    Note that 1877 ohm value is the 3,3v circuit and thus from these two the 3.3v inputs.
    The difference as far as I see it is the U807 1.19k versus 1227 ohms, but I have no reason to think that one of them is the cause.