[TechAssist] Re: Acer monitor 7176IE hor. drive not getting through




How can I get a copy of that schematic.I have three of these monitors that 
need repaired.


At 04:33 PM 4/22/02 -0400, you wrote:

>This is an Acer 17" monitor model 7176IE. There is no hi voltage. The
>green light on the front operates as normal. When the computer goes into
>standby, the green light turns to amber. When the computer is awakened,
>the light goes back to green. Hear a relay clicking and the power supply
>running but thats it. I do have a schematic.
>
>I get a hor. rate square wave coming out of IC304 pin 7, 1.5V p-p. By
>the time this signal reaches the gate of Q307 (IRF630) hor. driver, the
>pulse is 0.8V p-p. There is 22.7 DC  Volts on the drain of Q307. Also,
>all the other B+ lines appear to have proper or very close to proper
>voltages. Should the amplitude of my hor. drive pulse high enough to
>drive Q307? If so, why isn't the Mosfet conducting? If the pulse is too
>low, is this monitor in some type of shutdown mode where it is not
>allowing the pulse to be a greater amplitude?
>
>Have changed Q307 and Q303, no differnce in operation. Also soldered
>anywhere on the board that didn't look the best. HOT Q306 doesn't check
>shorted.
>
>Thanks for any help.
>--
>
>
>
>Gary McCartney
>
>McCartney Electronics
>7134 Fife Rd, RR 7
>Guelph Ontario Canada N1H 6J4
>Fax: (519)821-1530
>email: number63@xxxxxxxxxxxxx
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