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My nephew brought me his PSP after watering it.

I found the PSP was working exept the LCD backlight.

So I disassambled the device and searched for water marks. I found the marks directly on the LED driver circuit. After cleaning and checking the 0.5A fuse (was OK) I dicided to find out the chip. It took me some time to find the correct chip. It was a TB62752AFUG LED driver. It's a step up converter with current output. It can deliver up to 40V.

Because I cound not find out, which device was broken, I ordert all part (exept the resistors) reworked them.

After reassabling the whole device, the backlight was working fine again and my nephew was happy.

  1. this picture was made after cleaning
    • this picture was made after cleaning

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  3. it took me some time to find the right chip:
    • it took me some time to find the right chip:

      • 1 - TB62752AFUG

      • 2 - Inductor 22µH/0.66A

      • 3 - MSS1P4-M3/89A

      • 4 - 2.2µF / 6,3V

      • 5 - Fuse 0.5A 0603

      • 6 - 1.0µF / 50V

      • 7 - Ferrite bead 30Ohm/3A

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Steven

Üyelik tarihi: 06-05-2014

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