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Avanaboy has released P-Tester v2, which is a diagnostic tool for your PSP. P-Tester lets you do a lot of testing on things such as the buttons as well as fixing pixels and several other useful functions. Listed below is a message from Avanaboy on what P-Tester can do for your PSP.
Source
With P-TESTER you can
Test your PSP BUTTONS
Test your PSP DISPLAY FOR STUCK PIXELS and FIX IT
Test your PSP AUDIO SYSTEM
Test your PSP BATTERY (since V1.5)
Test your UMD Drive and your UMDs (since V2.0)
more features will be added soon
Credits
I'm releasing the source code too. I think that this might be useful
for those that want to learn PSP programming basics, and for those that
just want to see how P-TESTER works.
Test your PSP BUTTONS
Test your PSP DISPLAY FOR STUCK PIXELS and FIX IT
Test your PSP AUDIO SYSTEM
Test your PSP BATTERY (since V1.5)
Test your UMD Drive and your UMDs (since V2.0)
more features will be added soon
Credits
I'm releasing the source code too. I think that this might be useful
for those that want to learn PSP programming basics, and for those that
just want to see how P-TESTER works.