Question about ViewSonic VX924 19" LCD Monitor

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DELL P1130 I posted this a while back and got some good feedback but am stuck again. The G2 voltage is 630V, way higher than the 400V it should be. I have a schematic but can't figure out which resistors would affect (drop) this voltage. Thanks. dewberrp

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  • dewberr Sep 26, 2008

    I replaced the pot, even tried substituting ones with more and less resistance. No avail!. There should be a high voltage resistor or resistors which control the front panel controls for brightness and contrast. I fixed a similar monitor by dropping this resistance from 10Meg Ohm to 6 Meg Ohm. However I can't seem to find the corresponding resistors in this model.

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Hi there,
Please send me the schematic diagram of an HP lcd monitor

Yours,
George.

Posted on Sep 26, 2008

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Usually the screen control potentiometer cause this type of problem, you can check the screen control is working properly.If not you have to replace the flyback transformer.

Posted on Apr 09, 2008

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hi;
  1. Diode: UF4007, 1000V 1Ampere ; for 72V
  2. Diode: GUR460L, 600V, 4Ampere : for 50V
  3. Diode: UF5404,400V, 3Ampere: for 6.3V
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Monitor comes on then goes black


I've got a couple of these monitors that have the same problem. All the caps in the P/S except the large inverter filter (110uf/400v) are bulged. I;ve ordered all the caps - INCLUDING the one that doesn't look bad since all have been subjected to the same high heat (or are bad caps in the first place {Non standard?} so am attempting to prevent a recurring problem. Since all of them cost around $6 TOTAL (plus s/h) there's absolutely NO reason not to replace all of them. The ones in my monitors are: 1-22uf/50v, 1-100uf/400v, 1-470uf/10v,2-1000uf/10v and 3- 470uf/25v. I opted for the slightly higher voltages available when I ordered since that also helps and there's plenty of room. the 10v caps will be replaced by 16v ones, the 25v by 35v while the 50v & 400v will be the same voltage. Hope this helps somebody. Good luck and solder quick to keep the heat down.

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Brightness


Hi,

All CRT type monitors have an FBT that supplies the high voltage to the tube. Additionally, it also supplies the G2 voltage that is responsible for the screen voltage. Often the adjustment for the Screen/G2 requires a bit of tweaking after some time of usage. Incidentally, there is another adjustment in the same area for the Focus control. Of course, adjustment would have to be done on a "live set" and on the high voltage section, extreme caution must be exercised when performing this operation.

In some extreme cases, it could be a cold solder or loose connection in the squarish PCB at the very rear of the tube. Alternately, it is also possible for a capacitor that is nearing end of life (dried up).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

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It could.Check the screen voltage G2,If its high more then 400v this fix could work.
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