Part alternative

Discussion in 'The Projects Forum' started by luke9511, May 28, 2014.

  1. luke9511

    Thread Starter New Member

    May 28, 2014
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    Hello i am working on a tv and need to replace the HOT (horizontal output transistor) which is a panasonic 2SC5904, but i cannot find this part for sale any where online and was wondering if anyone here knows of a good alternative for it that i can buy.
     
  2. vk6zgo

    Active Member

    Jul 21, 2012
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    If you have a circuit diagram,compare the circuitry with that of another similar TV.
    Some years back,we used to replace the 2SC series HOTs in Sony Profeel picture Monitors with Philips BU208D Transistors used in 27" Philips TVs.
    Sony were very good at quick parts supply,but the Philips devices were either in our store,or locally available.
     
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  3. t06afre

    AAC Fanatic!

    May 11, 2009
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  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    2sc5905 will do or Bu208d
     
    Last edited: May 28, 2014
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  5. luke9511

    Thread Starter New Member

    May 28, 2014
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    my only issue with the ones from ebay is that they are used i would rather buy a new one than buy one that may have been pulled from a bad set

    edit after checking Bu208d it would not work as there is not enough room for that type of hot on the board
     
    Last edited: May 28, 2014
  6. vk6zgo

    Active Member

    Jul 21, 2012
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    Yeah,BU208D is a T03 package---try BU508D which is in a similar package to your original one,& if I remember correctly,is electrically identical to the BU208D.
     
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  7. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    2SC5904; Polarity: NPN
    Maximum collector power dissipation (Pc), W: 65
    Maximum collector-base voltage |Ucb|, V: 1700
    Maximum collector-emitter voltage |Uce|, V: 600
    Maximum emitter-base voltage |Ueb|, V: 7
    Maximum collector current |Ic max|, A: 17
    Package = TOP-3E-A1

    It has NO body diode, so you can't use a BU508D, you should use a BU508.

    But a BU508 is probabaly not large enough Ic? The 5904 is rated for 17A Ic and peak Ic of 27A! That's quite high. It must be a real big screen TV.

    (edit) the 5904 datasheet direct link is here;
    http://alltransistors.com/pdfdatasheet_panasonic/2sc5904.pdf
     
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  8. luke9511

    Thread Starter New Member

    May 28, 2014
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    thank you all for all your help, i went online and looked up how to test these transistors with my meter and the HOT tested fine so thats not it, however i tested Q504 which im not sure what it is yet, but anyway i tested one leg and got a reading and then i tested the other and didnt get anything at all, im thinking whatever Q504 is, its bad and needs to be replaced, now i just need to find a diagram and find out what exactly it is and see if i can find a replacement
     
  9. luke9511

    Thread Starter New Member

    May 28, 2014
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    for some reason i cannot edit my post above, but i desolder the part and using a magnifying glass i got the following off of it

    ST w3s428

    p15nk507
     
  10. Experimentonomen

    Member

    Feb 16, 2011
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    Why bother repairing a old eol crt tv ? Lcd/plasma is much higher quality picture and much higher resolution than any blurry worn out phosphor crt can ever dream of.

    I threw out everything crt years ago and never wanna go back ever again.
     
  11. luke9511

    Thread Starter New Member

    May 28, 2014
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    before this tv died it had a great picture, plus its free and i plan to use it with my video game consoles, but i also love fixing things and i like a challenge
     
  12. Experimentonomen

    Member

    Feb 16, 2011
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    For a gaming console, an old crt tv is the last thing i'd use. Ive used a plasma for 4-5 years now and i cannot even tolerate beeing near a crt tv anymore, that high pitched whine and flickery picture gives me epilepsy.
     
  13. luke9511

    Thread Starter New Member

    May 28, 2014
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    i like crt better for stuff like my consoles from the 80's and 90's but to each their own, if anyone knows what that part is and may know of a alternative please let me know thanks
     
  14. Experimentonomen

    Member

    Feb 16, 2011
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    I'd say pretty much any transistor with similar voltage, current and hfe(current gain) rating in the same package and same pinout as the original will work.
     
  15. luke9511

    Thread Starter New Member

    May 28, 2014
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    only thing is i cant find any info on it on google unless im using the wrong number or something

    EDIT ok i found the service manual and found this for Q504

    Q504 AE004387 TJXG15NK50 FET STP15NK50ZFP
     
    Last edited: May 29, 2014
  16. luke9511

    Thread Starter New Member

    May 28, 2014
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    oops sorry wrong forum for that reply
     
  17. Experimentonomen

    Member

    Feb 16, 2011
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    That Q504 looks more like the main psu switching fet. The HOT is usually a 1200V rated bipolar transistor from what i remember.
     
  18. vk6zgo

    Active Member

    Jul 21, 2012
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    LCD is OK,but Plasmas look like an analog CRT TV with differential phase problems!
     
  19. Experimentonomen

    Member

    Feb 16, 2011
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    Uh WRONG!!! LCD and plasma look flawless compared to any crt i ever seen.

    I cannot stand crt at all, gives me nausea, headaches and epilepsy.
     
  20. RobeeJ

    New Member

    Mar 19, 2013
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    Some old technology like light guns on old consoles/computers don't work without a CRT. Also some people like the retro look of scanlines. :)

    Beauty is in the eye of the beholder.
     
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