_XBrD4shDOE_808_
Member
hi, i bought a fat ps2 over the internet, the seller sent me a video in which it turned on normal and had a screen, recognized controller and memory card but it didn't open the drawer and it was at an attractive price, so I decided to take the risk for the OPL. As it is 110v and where I live it is 220v, I adapted an external 12v source to see if it would connect at least then I would try something different, I tested with two different sources, one of 1A and another of 2A and it turned on the green led but it turned red , so I thought it was low current and adapted a ps3 fat source on it.
I soldered the wires to the right points, +12v to 12V and GND to GND, I plugged it in and there is no red led (as far as I remember) and 3-4 seconds later white smoke came out from the bottom of the PS2 motherboard, I unplugged it at the same time and the smoke disappeared, but since then the standby led has not turned on.
I made several measurements on the board, I didn't find a short, with the exception of the 78m05 regulator that had a short between the two voltage pins but with resistance between the pin and the GND.
Replaced it but the same problem continued, but the resistance between the GND and the 12V pin of the MB went up, it is at 1468 Ohms.
I measured all the PS on the board, but I have doubts if some are open or burst, some when measuring with the multimeter show continuity, indicating that they are normal, while others do not appear on the multimeter display, I would need help to measure them correctly.
the curious thing is that, when making a jumper with a wire on the PS3, the resistance of the pins that connects the MB with the source changes, it goes from 1468 to something around 650 to 700 ohms, I don't know if it's right or not, no I tried connecting it like this.
fear in the lower part of the MB around the CPU and GPU and I got good resistances, 680 ohms more, without shorted ceramic capacitors, since electrolytic capacitors have lower resistance, but in general greater than 100 ohms and no short.
I've tried many things but nothing works, the only things I haven't done yet is measure if the MB is consuming current from the sources and I also didn't measure voltage at points on the board, I didn't want to risk that before talking on the forum to maybe increase the chance to repair it 
this is my report, if anyone has a schematic of his board (GH 26), primary points where I can measure voltage and resistance, what else could have gone off besides the regulator, anyway ideas of what I can do, thank you in advance for your help .
I'm sorry if there are spelling mistakes, my native language is not English and my English vocabulary is small and terrible.
I soldered the wires to the right points, +12v to 12V and GND to GND, I plugged it in and there is no red led (as far as I remember) and 3-4 seconds later white smoke came out from the bottom of the PS2 motherboard, I unplugged it at the same time and the smoke disappeared, but since then the standby led has not turned on.
I made several measurements on the board, I didn't find a short, with the exception of the 78m05 regulator that had a short between the two voltage pins but with resistance between the pin and the GND.
PS1: ?
PS2: ?
PS3: ?
PS4: OK
PS5: ?
PS6: OK
PS7: ?
PS8: OK
PS9: OK
PS10: has a jumper in place.
PS11: ?
PS12: ?
PS13: ?
PS14: OK
PS15: ?
PS16: OK
marked with '?' I don't know if they are good or bad, I need help to determine; marked with OK are good.
PS10 was made a jumper instead.
PS2: ?
PS3: ?
PS4: OK
PS5: ?
PS6: OK
PS7: ?
PS8: OK
PS9: OK
PS10: has a jumper in place.
PS11: ?
PS12: ?
PS13: ?
PS14: OK
PS15: ?
PS16: OK
marked with '?' I don't know if they are good or bad, I need help to determine; marked with OK are good.
PS10 was made a jumper instead.
fear in the lower part of the MB around the CPU and GPU and I got good resistances, 680 ohms more, without shorted ceramic capacitors, since electrolytic capacitors have lower resistance, but in general greater than 100 ohms and no short.
this is my report, if anyone has a schematic of his board (GH 26), primary points where I can measure voltage and resistance, what else could have gone off besides the regulator, anyway ideas of what I can do, thank you in advance for your help .
I'm sorry if there are spelling mistakes, my native language is not English and my English vocabulary is small and terrible.
