This is one of three things. Unfortunately, it's difficult to determine which, unless you start replacing parts.
1. Bad switch. The switch doesn't usually go bad by itself, has the PS2 been dropped? Bumped? Anyone push the switch too hard? It's held in by solder on all 4 corners. If the solder becomes dislodged, the switch can fail.
2. Bad cable. This is rare unless someone opened the PS2 and removed/installed the cable a few times and frayed the internal wires.
3. Bad motherboard. Sometimes a power problem can develop, or the motherboard can short out. It's pretty rare, but I have seen it happen.
4. Bad AC adapter. Recent power surge? It's possible that the AC adapter is delivering enough voltage to power the standby light, but not enough to power the actual system on. You can easily check this by plugged your PS2 up on someone else's AC adapter or taking your AC adapter to someone else's PS2.
You can find parts at the following page:
http://store.richspsxparts.com/ve12s.html
Testimonial: "thanks for your comments.speaking with a few people i now believe it's the motherboard. From time i had it chipped,there has been problem to power up."
I had the same problem. The lid lock assembly is broken.
If you are under warranty get it replaced. If not remove the top of the washer
and take out the switch assembly. The 4 wires going in are Yellow, Red, White,
and Blue. If you short the white and blue together, the washer thinks the lid
is closed. If you short the red white and blue together the washer thinks the
lid is closed and locked. The yellow is only there to activate the
electromagnetic switch.
Disconnecting the switch assembly will not work.
The electromagnet locks the lid and it also unlocks the lid. It is not a matter
of cutting the power to the magnet.
Installing 2 switches that connect the red white and blue is the best option if
you want to remove the lock.
The first switch should connect the white and blue. (LID CLOSED)
The second should connect the red to the white/blue connection. (LID LOCKED)
After that the lid should work.
Please post a follow-up if this works for you.
GOOD LUCK
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