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Sumvision SV 1000 recording DVD

Discussion in 'Electronic Repair' started by N_Cook, Jan 2, 2014.

  1. N_Cook

    N_Cook Guest

    Burnt and burst SMPS supervisor on this otherwise no-name and little
    chance Chinese thing. As laser and motor/s in the DVD deck and heatsink
    bonded to a video chip a reasonable power draw.
    But the SMPS IC , in a conventional 8 pin DIP package also contains the
    Tx driver transistor. So air gap under the IC and reverse side of pcb
    enlarged pad of pcb-copper as some sort of vain attempt at heatsink.
    Thermal connection to this is via just pins 4 and 5 combined in normal
    soldering , connected to the Tx. There is a hole through the pcb as
    though for some sort of clip to go perhaps top and bottom of the IC and
    bolted through to this under pad but no sign of anything having been
    fitted there, no deformation of the tinning over the pad around the
    hole. Turning over the unit and shaking over paper meant the blasted
    away top part , mainly, of the IC emerged but no clip at all.
    Is it possible to have combined supervisor and driver transistor in an
    8pin DIP package with no heatsink tab provision? or are there combined
    SMPS TX with internal driver transistor buried in the base?
    Also ps supply provision marked on pcb ac 85V - 250V
    IC logi i in a reversed D
    marked in 3 lines ICE 2?26 maybe more numbers, ? maybe a 4
    logo then 0 and more
    XK4.. probably more numbers
    probable pinning
    p1 0.1uF to 0V
    p2 to optocoupler
    p3 over current sense
    p4-p5 to Tx low side
    p6 n/c
    p7 supply <25V
    p8 0V
     
  2. N_Cook

    N_Cook Guest

    Its the first time I've come across such a situation, still does not
    look right. For something like a set-top box with no motors or laser and
    a graphics processor that does not require a heatsink, I could see it
    was possible
     
  3. N_Cook

    N_Cook Guest

    courtesy of alldatasheet with "start with" option
    ICE2 starting it seems its like a
    ICE2A265 with a different logo, same pinning on p4/5/6 at least
    large datasheet , will have to read it when I get some time
     
  4. N_Cook

    N_Cook Guest

    Perhaps another piece of hitech saved from the dumpster
    i in reverse D ,logo on
    http://www.aufzu.de/semi/siemens.html
    as infineon, perhaps older or IC only logo (don't know German) and the
    other pinnings agree with Infineon datasheet. Will get a few from RS ,
    but will add an underpad-soldered copper 20mm pcb fuse clip and white
    goo around the IC, assuming it will still oscillate etc
     
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