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It is possible that there is some foreign particles inside one of the connectors. Since the power supply does come apart and also disconnects from the unit, you can try to clean it to see if it will sort out your problem. Here's what to try:
1. Disconnect the AC adapter from the wall and the console. Let it rest for a few hours so that you do not electrocute yourself.
2. Disconnect the wall power cord from the AC adapter brick. Check the connections on both ends to see if it needs to be cleaned.
3. Clean any ends of the adapter with alcohol solution (isopropyl, or "rubbing" alcohol). Make sure the connection to the console is clean as well. Allow to dry.
4. Reconnect all necessary parts and try your console again.
If that does not work, there could be another problem with power flow to the AC adapter or a problem with the adapter itself.
What type of 'AC adapter'?
And 'converter box?'
Since the power supplies are pretty certainly 'switched mode' the 50 Hz line frequency shouldn't bother it so all you should need is a step-down transformer (220-110 VAC) unless the 360 specifies (for example) 100-250 VAC in which case you should need nothing other than a plug adapter.
If it is specified only for US power (~120 VAC) you may be able to get a step-down transformer from the local German utility. When I left there (many moons ago, I confess) they provided these on a free loan basis.
Sounds to me like the main board is bad. Last step to try just to be sure. Try another AC Adapter on your 360 and if it still doesn't work then you know the main board is bad. Also try just plugging in your ac adapter and see if the green light goes away or if it turns orange. Those are sure signs that the main board is shorting out the ac adapter. Also hook up the 360 to another power outlet.
Hi! TRY THESE TO SEE IF WE CAN GET YOU POWERED UP! :)
Confirm the system is not in HOLD mode Make sure the PSP system is not in Hold Mode (in the down position). Slide the Power/Hold switch up to clear Hold Mode. Or try sliding the Power/Hold switch up and holding it there until the power indicator light turns off and the PSP system is completely turned off. Then try turning the PSP on again.
Confirm the backlight is ON Make sure the LCD screen's backlight is not turned off. If it is, press any button to turn ON the backlight.
Confirm use of only licensed products (AC Adaptor, battery pack and charger) The AC Adaptor, battery pack and battery charger must be licensed for use with the PSP system. All licensed products for use with the PSP will have the following logos displayed directly on the product and/or the packaging: If any of the products you are using does not have these logos on them, we recommend that you immediately discontinue the use of these products, as they void the PSP system's warranty, and can cause damage to the system. See compatible peripherals for the PSP system for a full list of supported products. There are some products that can be used with the PSP system that may not display our logos. Products such as San Disk 1GB Memory Sticks, or various USB cables, needs only to be genuinely certified. Look for the genuine certified logos on these products or contact the company which manufactures these products for more information.
Try the battery pack only Unplug the AC adaptor from the PSP system. Make sure a charged PSP battery pack is inserted inside the PSP system. Turn on the unit. If you get power, then the problem may be with the AC adaptor and power cord.
Try the battery pack in a different PSP system If possible, try your PSP battery pack in a different PSP system. If your battery works on a different PSP system, it may indicate an issue with your PSP system.
Try a different PSP battery pack If possible, try a different battery in your PSP system. If a different battery pack does work on your PSP system, it may indicate an issue with the original battery pack.
Try the AC adaptor and the PSP battery pack Insert the battery pack and plug in the AC adaptor. If you still do not get any power, your PSP system may need to be sent in for service (see PSP Service for details).
Try the AC adaptor / power cord only Turn off the PSP system, unplug the AC adaptor, and remove the battery. Now plug in the AC adaptor to the PSP system with the battery removed. Confirm the AC adaptor and power cord are firmly connected to each other. Now make sure they are also firmly connected to the PSP system and the electrical outlet. If the PSP system powers on, the battery may need to be replaced.
Check AC adaptor and power cord for damage Visually inspect the AC adaptor and the power cord for damage. Do not use if frayed, cut, or damaged in any way.
Check the electrical outlet Confirm the electrical outlet that you are using is active (receiving power). Try using a different electrical outlet.
Try a different AC adaptor and power cord If possible, try a different AC adaptor and power cord. If a different AC adaptor and power cord does not work, the PSP system may need to be sent in for service (see PSP Service for details).
Confirm no unauthorized system software or downloads were used Confirm that you have not used any unauthorized system software updates or downloads on the PSP system. Use of such unauthorized firmware updates voids the warranty and can damage the PSP system.
WLAN turned off Make sure the wireless (WLAN) network function is not in use while charging. The battery pack cannot be recharged when the WLAN function is being used.
Power surge If you experienced a power surge, shortage, or a lightning storm in your geographical area recently, this may have affected the PSP system's power supply. Please contact Consumer Services below for information.