Hi All,
Over the last year I have been working on building a nice clean 5150. And had just got to the point where I had the machine working reliably when it stopped working ...
The machine was my second 5150 which I was also using to debug a fault on another 5150 (which has a constant noise on power up see my other threads). During this time I have managed to build a nice stash of working CPU's / RAM, video/floppy cards, PSU's etc.
Prior to the machines death, I had a fully working machine that would boot to DOS (original with a VGA card). Landmark digs ran clean (with a CGA card in place).
I noticed just before full death had 'hung' - with an DOS image still on the screen (from VGA). I rebooted the hung machine and now it does not post (blank screen/PSU fan spinning/ no beeps).
I have tried swapping (for know good):
IBM BIOS
Landmark BIOS
PSU
Video Card
CPU
I am now assuming that the issue is a Capacitor somewhere?. My soldering skills are bad, so I don't really want to start unsoldering caps to test.
My question is it possible to use an ESR tester to test the capacitors in situ?.
Am I missing something obvious (I did run through Modem7's excellent debugging list)
Any help appreciated.
Kind Regards
Rich
Over the last year I have been working on building a nice clean 5150. And had just got to the point where I had the machine working reliably when it stopped working ...
The machine was my second 5150 which I was also using to debug a fault on another 5150 (which has a constant noise on power up see my other threads). During this time I have managed to build a nice stash of working CPU's / RAM, video/floppy cards, PSU's etc.
Prior to the machines death, I had a fully working machine that would boot to DOS (original with a VGA card). Landmark digs ran clean (with a CGA card in place).
I noticed just before full death had 'hung' - with an DOS image still on the screen (from VGA). I rebooted the hung machine and now it does not post (blank screen/PSU fan spinning/ no beeps).
I have tried swapping (for know good):
IBM BIOS
Landmark BIOS
PSU
Video Card
CPU
I am now assuming that the issue is a Capacitor somewhere?. My soldering skills are bad, so I don't really want to start unsoldering caps to test.
My question is it possible to use an ESR tester to test the capacitors in situ?.
Am I missing something obvious (I did run through Modem7's excellent debugging list)
Any help appreciated.
Kind Regards
Rich