Through inspection found TH602 burned in switching power supply, TH602 is current limiting element, its damage related to the stand or fall of switching power supply IC 2 s0680, and C610, C618, D611, R611 is normal or not. The above resistance capacity is measured with a multimeter in components and diode are normal, and then 2 s0680 each foot of ground resistance measurement, found that in addition to {3} feet outside the earth resistance value is 0 Ω, haven't seen each other foot abnormalities. Measure 2 s0680 will be removed, found its with {3} {2} the feet between short circuit. {3} feet is starting circuit, the resulting switch power supply circuit can not work normally. Will 2 s0680 and TH602 replacement after the commissioning, the display back to normal work. If TH602 (SCK083) for less than the original model, available Ω 4.7/5 w token resistance. zbSservice manual download site
 zbSservice manual download site
 zbSservice manual download site
Checked by actual measured (use MF47 multimeter R x 1 k block), normal 2 s0680 each foot on {2} the resistance of the foot, respectively is: black pens and meet {2}, {1} feet for 6 k Ω, {3} feet 9 k Ω, {4} for 11 k Ω feet, 5 foot 8 k Ω; Red pens and meet {2}, {1} feet up, {3} feet for 500 k Ω, {4} feet for 150 k Ω, {5} for 42 k Ω foot.zbSservice manual download site