Place the BD140 over the bolt with the metal faced heatsink side upwards. 5. Solder the centre lead of the BD140 to the end of R18 furthest from the bolt. Solder the outer leads of the BD140 to either side of R10 such that they don't cross over. A minor shift in the backlight dimmer levels is to be expected due to the different gain of the transistor. The diagram below shows a modified board.
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