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Yes I did this with a small reed relay on my old laptop system. I believe I had the relay coil wired to 5V, and the other side to the PIC output. The contacts of the relay switched the screen on/off, and it was isolated from the ITPS. Worked for me but I'm not an EE.
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2002 Nissan Altima 3.5 5 Speed Bose FM/6CD ED E12A P4 2.26 512 Ram Ti4600 CDRW DVD Lilliput 200mW 802.11b Trackman AutoTap GPS Opus 150 Carnetix 1260
2005 Nissan Titan SE Dell GX-150 P3 1.0 512 Ram 20G GF4 MX4000 USB 2.0 DVD/RW Xenarc GPS Trackman
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