I have a VX924 that would come on for about a second, then the screen would go blank. If I held a bright light to the screen, you could still make out the image oin the screen, so the backlights were turning off then shutting down.
I took it to my cousin who diagnosed that there were two Surface mount transistors (I believe transistors...hard to say without a schematic) that were shorting out. The are on the Invertor side of the PS for the lights, and are at position 'Q6' and 'Q7'.
Does anyone know what generic part numbers these transistors are? Anyone have a schematic?
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Besides those transistors, you may also fine the large capacitor
adjacent to the transformer gone too, Possibly the transformer may be
bad too ?
Also the 924s used at least two style boards.
Two possible causes are bad capacitors or a bad light inside the LCD panel.
Open the unit and check to see if any of the capacitors in the power supplyor other boards look domed or vented on the top.
Replace any capacitors accordingly. Monitor should work fine after that.
If not try checking the surface-mount transistors on the inverter board
that run the lights. Some times these transistora go bad. Also, you may
have a bad light inside the panel. This is tough to test without a
spare light to use for troubleshooting the panel lights.
You can take the panel apart and inspect the lamps but it is very
tedious. It's tough enough to get them apart and back together again
never mind keeping the layers clean. You have to try not to get any
dust between the layers or you will see it in the picture.
There's usually two light fixtures each of which holds two lamps. One
fixture at the top and one at the bottom. Remove them one at a time and
inspect the lamps to see if any are broken or very dark on the ends. If
one looks out of place, it could be bad.
You'll have to find replacement lights on the net. It's not easy to
replace them, but if you've gone this far, good luck. You should be
able to get generic instructions off of the site that sells the lamps.