Question Old CRT TV with a power supply fault

Discussion in 'General TV Discussions Forum' started by Jon Bradbury, Jan 5, 2017.

  1. Jon Bradbury

    Jon Bradbury
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    hi

    Not sure if this is the correct place to ask, but I am trying to repair a computer with a power supply fault. It's an Amstrad PCW 8256, and it uses a TV power supply to provide power to the computer and CRT tube. The symptom is that it is dead, and I have checked fuses and that 240v is appearing on the board. The bridge rectifier is OK. Ath the heart of the thing is a power regulator chip, the STK7308, which was common in TVs once upon a time. I have tried to find some technical specs on the thing but so far nothing detailed has come to light (although there are several single sheet specs).

    There is a schematic for the power supply in the service manual, here: http://www.cpcwiki.eu/manuals/Amstrad PCW 8256-8512 Service Manual.en.rar

    Is there anyone here with TV repair experience who can offer any advice?
     

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