Hello everybody!!!
Once again, i ve got problem with my X68000 XVI version.
The computer power up well, but the 16 mhz led is blinking and it shutdown 10 secondes after startup. I never opened it, capacitors are originals.
Do you think that is a PSU issue ? I ve already my X68000 compact ( no adpcm sound) to repair.... I'm very unlucky .... :'(
Is it a known problem on the XVI ?
Thanks so much!
ALL X68000s MUST BE RECAPPED.
END OF STORY.
You are not unlucky, the failure rate of an X68000 that has not been recapped is 100%
ok ok.
First i will try to finish my Compact with his adpcm issue.
Next, i will recap the XVI.
I spend more time repairing than playing..... >:(
For info, is there a list of capacitors for the XVI ?
NEWS 24/09/17
- Removed psu from my XVI and tested it. Fan spin 5 seconds and the psu shutdown . So The culprit seems to be the psu.
- Opened the psu to check inside. Brown fluid on certain parts!!!!!
- 1 capacitor is curved on top.
(https://img11.hostingpics.net/thumbs/mini_68490320170925093735.jpg) (https://www.hostingpics.net/viewer.php?id=68490320170925093735.jpg)
(https://img11.hostingpics.net/thumbs/mini_99411020170925093847.jpg) (https://www.hostingpics.net/viewer.php?id=99411020170925093847.jpg)
Ho my god!!! Never saw such so bad capacitor!!!!! :o
(https://img11.hostingpics.net/thumbs/mini_39536920170925101054.jpg) (https://www.hostingpics.net/viewer.php?id=39536920170925101054.jpg)
Time to change all the caps and clean up that leaked cap juice!
Hello,
I ve changed all capacitors but now Psu won't power up!!!!! >:( >:(
I ve checked all capacitors, fan, switches ( psu and computer) everything is ok.
I ve tried to shunt "gnd" + "power on" to start the psu without result.
Psu power up well after capacitor replacement... I don't understand the problem... :o
Hi,
The X68000 power supplies are powered up by applying a positive voltage to the Power Control line, unlike modern ATX PSUs.
To test it, connect the Power On line of the PSU to its +5Vsb/Vcc2 line through a resistor (approx. 4.7kOhms is OK). It should power up instantly.
I strongly advise against connecting directly the Power Control line to a +5V source, as it may fry the transistor used to control power.
Thank for advice.
I ve tested diode zener zd 31. With multimeter i can read 0.06mv in both direction. Diode not desoldered from pcb.
Quote from: JulBS0 on October 09, 2017, 09:44:29 PM
Hi,
The X68000 power supplies are powered up by applying a positive voltage to the Power Control line, unlike modern ATX PSUs.
To test it, connect the Power On line of the PSU to its +5Vsb/Vcc2 line through a resistor (approx. 4.7kOhms is OK). It should power up instantly.
I strongly advise against connecting directly the Power Control line to a +5V source, as it may fry the transistor used to control power.
Tested with 4,7kohms resistor but psu won't power up.
I will change ZD31.
Bingo!! ZD31 ( 6,8v 500mw) was dead .
(https://img15.hostingpics.net/thumbs/mini_281011201710141650051.jpg) (https://www.hostingpics.net/viewer.php?id=281011201710141650051.jpg)