Author Topic: X68000 XVI shutdown PSU repair SOLVED!!!  (Read 305 times)

Offline gypsie

  • MassiveMember
  • ****
  • Posts: 139
X68000 XVI shutdown PSU repair SOLVED!!!
« on: September 17, 2017, 03:39:39 am »
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!
« Last Edit: October 15, 2017, 01:28:24 am by gypsie »

Offline SuperDeadite

  • MassiveMember
  • ****
  • Posts: 367
Re: X68000 XVI shutdown
« Reply #1 on: September 17, 2017, 11:05:32 am »
ALL X68000s MUST BE RECAPPED.
END OF STORY.

Offline kamiboy

  • ThrobbingMember
  • *****
  • Posts: 574
Re: X68000 XVI shutdown
« Reply #2 on: September 17, 2017, 06:54:50 pm »
You are not unlucky, the failure rate of an X68000 that has not been recapped is 100%

Offline gypsie

  • MassiveMember
  • ****
  • Posts: 139
Re: X68000 XVI shutdown
« Reply #3 on: September 17, 2017, 07:17:33 pm »
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..... >:(

Offline gypsie

  • MassiveMember
  • ****
  • Posts: 139
Re: X68000 XVI shutdown
« Reply #4 on: September 17, 2017, 07:22:40 pm »
For info, is there a list of capacitors for the XVI ?

Offline gypsie

  • MassiveMember
  • ****
  • Posts: 139
Re: X68000 XVI shutdown
« Reply #5 on: September 25, 2017, 02:42:15 am »
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.






« Last Edit: September 25, 2017, 06:27:17 pm by gypsie »

Offline gypsie

  • MassiveMember
  • ****
  • Posts: 139
Re: X68000 XVI shutdown PSU repair
« Reply #6 on: September 25, 2017, 06:18:33 pm »
Ho my god!!! Never saw such so bad capacitor!!!!! :o


Offline RobIvy64

  • MassiveMember
  • ****
  • Posts: 467
  • Texas!
Re: X68000 XVI shutdown PSU repair
« Reply #7 on: September 29, 2017, 01:44:11 am »
Time to change all the caps and clean up that leaked cap juice!
"Console Mods" lurker

Offline gypsie

  • MassiveMember
  • ****
  • Posts: 139
Re: X68000 XVI shutdown PSU repair
« Reply #8 on: October 09, 2017, 06:50:23 pm »
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

Offline JulBS0

  • SmallMember
  • **
  • Posts: 4
Re: X68000 XVI shutdown PSU repair
« Reply #9 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.

Offline gypsie

  • MassiveMember
  • ****
  • Posts: 139
Re: X68000 XVI shutdown PSU repair
« Reply #10 on: October 09, 2017, 10:25:03 pm »
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.

Offline gypsie

  • MassiveMember
  • ****
  • Posts: 139
Re: X68000 XVI shutdown PSU repair
« Reply #11 on: October 13, 2017, 04:59:13 am »
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.

Offline gypsie

  • MassiveMember
  • ****
  • Posts: 139
Re: X68000 XVI shutdown PSU repair SOLVED!!!
« Reply #12 on: October 15, 2017, 01:32:29 am »
Bingo!! ZD31 ( 6,8v 500mw) was dead .