like to share this design problem concerning the AOC e1620 - e1660sw
Symptom: the monitor is turning on and off randomly. the 14.5 volts supply the power to the LCD driver board.. measuring fluctuating 15 to 17 volts the reason the lcd is turning on and off due to over voltage the protection circuit is kicking in.
i notice the e1620 service manual page 29 as you can see 14.5 volts output but in my circuit its measuring 15-17 volts. all parts checkout good but the output voltage is fluctuating. i check the zener diode 18B in aoc e1620sw and 20b in aoc 1660 sw same circuit. 18b is 17.8 volts zener and 20B is 19.8 zener there is no way you can come up with 14.5 volts out..
so i decided to replace it with 14volts zener and the output now its 14 volts regulated and its working perfectly. hope this helps.
Symptom: the monitor is turning on and off randomly. the 14.5 volts supply the power to the LCD driver board.. measuring fluctuating 15 to 17 volts the reason the lcd is turning on and off due to over voltage the protection circuit is kicking in.
i notice the e1620 service manual page 29 as you can see 14.5 volts output but in my circuit its measuring 15-17 volts. all parts checkout good but the output voltage is fluctuating. i check the zener diode 18B in aoc e1620sw and 20b in aoc 1660 sw same circuit. 18b is 17.8 volts zener and 20B is 19.8 zener there is no way you can come up with 14.5 volts out..
so i decided to replace it with 14volts zener and the output now its 14 volts regulated and its working perfectly. hope this helps.
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