vu+ duo v2 psu q1 short

Discussion in 'VuPlus Duo Hardware troubles and Repair support.' started by jimbofz, Nov 11, 2019.

  1. jimbofz

    jimbofz New Member

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    hi can anyone help ,vuduo version v2 not duo 2
    q1 and qo1 blown ,zd 1 s/c
    until this morning psu been behaving , i think the mains switch at the rear has caused this possibly arcing as it looks discoloured
    last year replaced all the caps that tested on my cap esr meter as faulty
    qo1 has 4 legs and i assume its a fet but cant find any data on thes device and the surface mount ic q01 is s/c but cant identify it the small letters on it are impossible to identify
    as an ex retired tv repair man i would like to repair if i can source the parts and a cct if possible of the front end of the psu thanks
     
  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Hotzone parts..
    As for the Q1, you talking probably about the 5L0565R which is an power switch with four legs.
    The Q01, 3p transistor, I need to check, but not earlier than on Wednesday, same as the zener diode ZD1.
     
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  3. jimbofz

    jimbofz New Member

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    thanks
     
  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Sorry, but yesterday I was not there, (my work shop) but tomorrow in the evening, or Saturday I'm there to check the other parts.
     
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  5. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Okay, about the Q01 sot23-3 transistor.
    This was a bit difficult because it was not so good to read, even with a microscopic view it was difficult as you can see on this picture.
    Vuduo-psu-Q01.jpg
    But if I see it correctly, then it is the smd sot23-3 5Cs and by searching to it by google search, it seems to be the
    BC 807 as for example you can see by this seller which show this picture,

    Vuduo-psu-Q01e.jpg

    As for the zener diode ZD1,
    Mine has as far as I see it 15, then 2 printed on it thus 152, as you can see on this pics,
    Vuduo-psu-ZD1-A.jpg
    Vuduo-psu-ZD1-B.jpg

    Another psu i have has another marking code, the 20B.
    In any case, by searching with google to it, you may find it.
     
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  6. jimbofz

    jimbofz New Member

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    thanks for taking time to help me,
    you did well to take the pics sepecially as the surface mount transistor is so small
    the diode as far as i can see has" 15 and, c20 or 020" marked on it,
    so i think its a 20volt zener,
    also theres a 1uf cap thats low ,
    i will keep you up to date with progress
    just wondered if the genuine duo psu is interchangeable with the ferrari v2 as i may have more luck finding a cct diagram for the original duo psu to confirm the zener diode voltage before i replace the items .
     
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  7. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Reply to, just wondered if the genuine duo psu is interchangeable with the.....
    The original psu of the Vu+ Duo (at least the one I own) is not the same design as from the clone.
    As you could see on this pictures..
    vuduopsu-a.jpg
    vuduopsu-b.jpg
    Thus as for the ZD1, it may have another value than the ones for the clones because it has another type power transistor etc.
    Of course, the original psu can be used on a clone motherboard, they have the same voltages outputs.
     
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  8. raza05

    raza05 Active Member

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  9. jimbofz

    jimbofz New Member

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    oh i see ,the orig ,psu front end has a higher component count ,
    from the pic,
    the primary is a bit crowded
    ive ordered the 5lo565r so i have to wait .from memory the zeners i used to use were typically bzy 88 then followed with c and then the value ,eg ;bzy 88c12 was a 12v zener
    i can see on mine c20 so im hoping its correct such a shame theres no cct diagram any where to confirm
     
  10. jimbofz

    jimbofz New Member

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    UPDATE
    finally recieved parts from china ,
    replaced q1 , q01, zd1 ,and the 1uf cap ,for the zener i used 15v type,
    still wont power up ,no blown fuse ,so tried 20v zener , still no joy
    you may remember there was confusion identifyine the zener that was s/c
    its markings were c20 5t or c20 st,
    after spending hours on web trying to find out the correct zener voltage value .
    the octo couplers were tested for s/c and the main smoothing cap 100uf measures 98uf in my cap meter .
    i linked out the rear mains switch as i suspected it was the cause of the original psu failure possibly arcing
    so now i will try to buy another duo for parts
    and hope i can salvage another psu
    theres a healthy 400v across the bridge but 5lo565r wont turn on
     
  11. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Maybe, if you give a good quality picture of your psu print side, then I could maybe see something wrong on it.
     
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  12. jimbofz

    jimbofz New Member

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    could you please check the surface mount resistor value of r10 its connected to the emitr of q01,
    it measures 190 ohm in cct but looking with magnifying glass theres no numbers on it ie,101 for 100 ohm,it may be high resistance .also shown as r05 is a surface mount white cap ,the marking on the print side of board are incorrectly marked as r05 not c05
    the 3 optocouplers have been tested as has the chopper tx and all other components in the primary
    ive taken pics and will now try to upload them the 3.15 fuse has not blown and when live, theres ht across the s block. the 4 startup resistors in parallel in situ read around 50k which is correct.
    so basically psu just sits there and wont start up
     

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  13. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    The R10/R05 both markings code 101 resistor itself gives the 99.5 ohms value, and measured it between a ground spot on the hot side and the R10/Q01 side gives with loading up a from around 1.7xx M and rising up.
    The other leg of the Q01 to the bridge wire gives 4.11M.

    The psu I have measured it is working, thus you may assume that these values are correct.
    However, I have only one psu from this type, another one do no longer have this Q01 as you can see on this picture.

    Vuplus-psu-qo1.jpg
     
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  14. jimbofz

    jimbofz New Member

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    ok now it makes sense
    the two surface mount resistors r10 and r5 are both 100 ohm
    what confused me was
    if you look closely at the pic of my psu
    you see that ro5 is white which i thaught was a cap ,
    but its a resistor with the top layer blown off revealing the white body underneath
    it measures o/c (if it were a cap that would be normal)
    so hopefully if i replace both with 100 ohm all should be ok ,so now its off to workshop to find 100 ohm resistors
    thanks ill keep you posted
     
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  15. jimbofz

    jimbofz New Member

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    ok good news after fitting two 100 ohm resistors psu started up, at least the red light came on ,
    but nowt else
    so i then used a hair drier to gently warm the main board around the psu area for a few minutes ,
    then tried again and starting sequence appeared and then all ok .
    i presume with the box being out of use and in the garage workshop it got used to being asleep!
    ill test over the next few days and report back .
    theres a component marked as a coil l5 but it has a resistor 390 ohm not a coil is this normal?
    finally can anyone suggest where i can buy a replacement rear mains switch ,i have many switches from when i used to repair tvs ect but would like to use original
    thanks to all especially johnny b for taking time to help
     
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  16. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    As for the rear main switch, I have here one of the brand BX with the model number KDC1-104, see this link for example and google to it to find a cheapest seller.

    About the coil L5 and assuming you have it about one from the psu, that's correct, some types psu's have a inductor (coil) and others the Resistor: 390 Ohms 5%
     
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