'''<big>Bought a 464 or 6128 from eBay and its not ? Not working ? Then read on..</big>'''
Firstly, make sure your 5v power supply and monitor are working ok. (You'd be surprised...)
Firstly, make sure your 5v power supply and monitor are working ok. (You'd be surprised...)
Check it with a multi meter and make sure it provides a minimum of 2A continuous current. Some modern switch mode PSUs are very optimistic in their "ratings". You don't need a 12v feed for anything except the 3" disk drive. So it can be omitted for testing. Earth yourself to prevent static damage or better yet, get an anti-static strap. 30yr old machine remember... The obvious things to check first are: 1: check the 5v power socket and DIN6 display socket for dry solder joints. 2: check the rest of the board for dry joints too. Never touch the soldering iron tip onto a joint for longer than 2 seconds. This is to avoid damaging components. 3: Check for any damaged or leaking capacitors. Check the ceramic ones too, in case a previous owner has knocked one. 4: Examine all the chips for any corrosion, damage or discolouration. The most common fault is probably someone having plugged a 12v PSU into the 5v socket. and damaged
This usually fries some or all of the ram (memory) and may sometimes damage a
few ceramic capacitors along the way.