Hi Guy's n Girl's
Took my Head out of my A4000 today & carried out capacitor replacement for Scrappyshinx's A3640 CPU Board.
As many may have heard me say before these boards suffer from an incorrect silk screen layout & the Capacitors C105,C106 & C107 are inserted the wrong way round.
This does lead to shortening the cards life & the capacitors leak nasty PCB eating acid...
SS's CPU board was already missing C106, continuity tests proved the remaining two capacitors were indeed incorrectly polarised.
OK Removal time, as soon as my Iron touched the legs of one of the caps the unmistakable smell of acid erupted......euch
Consequently further examination revealed that 3 pads had been all but been consumed, acid spillage had travelled to nearby chips too.
There was no other way but to clean out the relevent pinholes (filled with gunk from the acid) & attempt to fit conventional capacitors in place in order to save the card.
After carefull soldering & using sticky foam pad to secure the caps, success
C106 was replaced with an SMD cap of course as it's pads were fine.
Now the Board was fully cleaned up, continuity tests proved all capacitors were in circuit and active.
I then fitted the board to my A4000 (god I thought I wasn't touching it today!!!) & ran the board for 1 hour proving fault free & stable operation...Sysinfo also reported & performed as it should. !!!!
Another A3640 saved from the Tip and not a moment too soon by the look of it !!!!!!!
TC :mrgreen:
Took my Head out of my A4000 today & carried out capacitor replacement for Scrappyshinx's A3640 CPU Board.
As many may have heard me say before these boards suffer from an incorrect silk screen layout & the Capacitors C105,C106 & C107 are inserted the wrong way round.
This does lead to shortening the cards life & the capacitors leak nasty PCB eating acid...
SS's CPU board was already missing C106, continuity tests proved the remaining two capacitors were indeed incorrectly polarised.
OK Removal time, as soon as my Iron touched the legs of one of the caps the unmistakable smell of acid erupted......euch
Consequently further examination revealed that 3 pads had been all but been consumed, acid spillage had travelled to nearby chips too.
There was no other way but to clean out the relevent pinholes (filled with gunk from the acid) & attempt to fit conventional capacitors in place in order to save the card.
After carefull soldering & using sticky foam pad to secure the caps, success
C106 was replaced with an SMD cap of course as it's pads were fine.
Now the Board was fully cleaned up, continuity tests proved all capacitors were in circuit and active.
I then fitted the board to my A4000 (god I thought I wasn't touching it today!!!) & ran the board for 1 hour proving fault free & stable operation...Sysinfo also reported & performed as it should. !!!!
Another A3640 saved from the Tip and not a moment too soon by the look of it !!!!!!!
TC :mrgreen: