I have 2 HP1940 LCD monitors using a benq inverter board
this board is very very similar to the benq board used in the Q7T4-FP71G monitor .I have downloaded the service manual but the schemtic is not complete ....I seem to have the same problem as everyone else with back lighting only coming on for a second ..can any one help with a full schemtic of a benq board
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After changing the caps, do you get steady 12~18vdc feeding the inverter circuits? Inverter fuse OK? It can be bad transformers, or lamps also. Pictures will be great help. See where I post my pictures: http://s807.photobucket.com/home/budm/allalbums
Fist check the fuse on the inverter board if it is blown replace it if not you need another inverter board as it has fried. But I looked and was unable to find a new/replacement inverter online so I wish you the best of luck
You have BenQ syndrome.
Sounds strange I know, but the power supply in your monitor is a BenQ manufactured part.
The problem is in the inverter section of the power/inverter board.
There are 4 small transistors (marked C5707) 1 or possibly 2 of these will have shorted out. Using a multimeter find the shorted one, and replace both of that pair, even if only one is shorted out.
There could also be other underlying issues as well that caused the transistor to fail in the first place.
Resolder the power transistors on inverter board and also check them.If display is not there at all some of this 4 transistors C5707 should be defective.Check associated fuse and Fet which drives the transistor.
Also check with Benq ,Normally offers three year warranty.