Question about HP Pavilion DV9720US Notebook

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Hp laptop 9720us screen wont brighten or dim. last week my screen went blank brought it to a shop they changed the inverter and also some cable connection . works fine just not quite as bright as before . It is about 1 yr old I've changed power settings and nothing happens .i've tried changing default monitors and nothing changes. I've made sure I've updated the bios. I have also tried the fn+f7 and f8 key and nothing happens. I try to run in with and without the power cord and nothing . before it would dim on battery power. now its as bright as if I was on battery power. could I have a bad inverter ? I dont want to bring it back to the repair shop and get charged for something I could have done .. I have updated drives I've done a HP health check and it say everything works fine and latest drivers installed. the brightness is constant and I'd like to be able to adjust if for different situations .. can you help

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You got the wrong inverter fitted - i'm sure your unit requires a sinle lamp inverter and they have cheated - putting in a generic lamp inverter and branching togeather the wires to accomodate the single plug thus reducing the available volatage for the lamps - this is why it's dim - correct part is 431391-001 Display panel power inverter - For use with single lamp display panel

Posted on Aug 08, 2009

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