Question about IBM E74 17" CRT Monitor

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Pincushion problem.. my E74 has a pincushion problem. When i trace the fault, i found the TIP122 place at heat sink near flyback is short. When i put a new one, it can works only for a few seconds and get short back. i try put the 2SD2058. The situation is same. Diode, capacitors, FET in pincushion line is ok. Is out there anyone that power-expert technicion can help me? Show me your expertise. TQ.

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  • malaytech Apr 22, 2008

    2sd2058 bukan HOTransistor, BU2058 baru la HOTransistor, 2sd 2058 biasanya ada di monitor Samsung sebagai pincushion control. Saya guna sebagai substitute utk TIP122. HOT utk IBM E74 ni ok x short jd x nk suspect B+ coil short. Guna flyback tester pun lampu hijau jaa. Kalau open kaki collector 2sd2058 display ok cuma melengkung mcm pinggang.
    2sd2058 is not HOTransistor, BU2058 is HOTransistor, 2sd2058 is use in Samsung monitor as pincushion control. I use it as a substitution for TIP122 in several years ago(if i don't have TIP122 spare). HOTransistor for IBM E74 is ok, not short, so i don't think the B+ coil is short. The indicator of flyback tester is green that means primary coil is ok. If i free the 2sd2058 collector's pin, display is ok but the shape is very thin....



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Hang cuba tengok B+ line. Check FET tidak pun cuba tengok B+ coil dh short kot.

Posted on Apr 17, 2008

  • Ajemy  Rashid
    Ajemy Rashid Apr 17, 2008

    2SD2058 is it HOT transistor.? Try to check the primary coil fbt.

    Probably it has shorted that causes the Horizontal Output traansistor to blow up.



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