Question about Dell UltraSharp 1702FP 17" Flat Panel LCD Monitor

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LCD causes self-test to fail

Got a pair of Dell 1702FP monitors.  Was able to fix one.  Second one is more difficult.
Monitor lights flash, inverter does not power up.  I went inside, did some part swapping between the monitors.  Can confirm that inverter is good.   When I disconnect the upper right bundle of wires that goes to the LCD itself, the monitor's power lights behave normally, backlight comes on OK.
When I reconnect the LCD panel (pixel control, not inverter), the monitor seems to fail a self-diagnostic and the lights blink, no backlight.
What are typical problems for the LCD panel itself?  Are they fixable?

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Hello,

If the 3 lights are flashing then the problem is afew blow capacitors on the video driver board. We have a step by steprepair guide posted on our web site at: www.ccl-la.comIf you can solder then you should be able to do the repair. If youdon't want to do it we do offer a repair service for $30 plus returnshipping. let us know if you have any questions about the repair, youcan contact us at the address below.

I hope this helps, if so please rate our solution.

Buddy
Corporate Computer
www.ccl-la.com
tech@ccl-la.com

Posted on Dec 10, 2009

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Looks like you have a shorted IC ot transistor on the LCD layer of the panel.

If you remove the screws from the back of the panel and look underneath, you will see the circuit the main board plugs into. Usually there are a few components on this pcb that can go bad. Replacing them is a little hit and miss. If you can identify the component, you might stand a chance. I had a unit do this, and when I looked at the lcd pcb there was a shorted smt transistor. It was burnt, but I was able to remove it without damaging the board.
I managed to replace it twice with two similar transistors, but the panel still caused the power circuit to cycle when I plugged it in. Although I couldn't find any other shorted parts, the small smt ICs on the board could have had internal shorts, or the transistors I used to substitute were completely wrong for the circuit. Since the original transistor was burned, I could not identify it in any way.

The only hope for your monitor is to identify and replace the bad smt component on the LCD board, or replace the lcd layer itself. I've done this a few times, but it requires another of the same panels, one with a bad backlight perhaps. If you are careful enough, you can remove the metal frame assembly from the panel (there are usually four screws, two on each side). You will have to "unsnap" the outer frame from the inner frame all the way around the outside.
Do this to both panels, and place them face up on a desk or bench. Carefully unwrap the ribbon cable and remove the entire lcd layer. Do this a second time, only place the working lcd layer over the working backlight assembly. Make sure the lcd layer seats snugly in the frame and wrap the ribbon cable over the top. Reinstall the outer frame. You have to make sure everything stays aligned as you snap the outer frame back into place. Reinstall the screws. Now you should have one perfectly good lcd panel. Keep an eye out for a panel with a bad backlight.

Posted on Mar 27, 2008

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