Dell 1909Wf Service Manual
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Service Manual37Change U1054.Power (include IF +5Vand +3.3V) supply normal ,key functionOK,but backlight can’t be turned onBacklight cannot be turned on,is theon-off control signal come from IF ok?Is the CN851inserted CN101 OK?NOYesIs the on-off control signal #109 of U105high-low convertible when DC on/offNOYesIs thevoltage16V at T1PIN4?CheckT850 orF850NOYesYesCheck U1pin6 Voltageis 5VYesCheck U1 pin1Voltage islowerCheckQ3NOYESCheck T1 pin7 and pin10 Open orShortChange T1Yes |
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