I have a Dell W2600 with the notorious power fault,only the relay in PSU clicks upon power up and no Leds light up,14v and 22v inverter lines missing,5v and 9v present.I have reflowed BGA I231 on main board and 2 other BGA's on main board and still the same fault occurs.I think it as been proven that the PSU is not at fault on the dell technicians forum.
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If you can Solder and know what capaciotrs,resistors are you can ,or you can exchange out the boards. Look for Bad Capacitors on the Power Supply Board, this is the most common problem on these TVs 1000uf 16v 2200uf 10v 3300uf 10v they will be vented or puffed up on Top.
This sounds like Electrolytic Capacitors that are needing replacing, Common fault with LCD, If you know how to use electronic tools you can open the TV and you will see the tops of the capacitors are bulged and they need replacing.
The fault is most likely in the power supply, or one of the other boards in the set has a fault condition that is causing the power supply to shut down. The only way to service the set is by doing board swaps to determine the defective board(s).
If you call DELL, they will tell you where to send the set for service.
There is no fix for the W2600. It has a power supply problem.
For sometime Dell was replacing the tv's with new ones, but don't think they are anymore. If you go to the Dell Forum and type in your tv you will see the amount of people that have had the same problem. Unbelieveable. As a matter of fact, Dell is not even making TV's anymore. Guess they gave up. They cannot be fix, cannot get the parts for it.
I have had the Dell W2600 for about 4 years. My remote for the Dell stopped working after 16 months. Since I was using cable I used the cable box remote. However, about 6 months ago a dark shadow appeared on some parts of the screen but the tv was still viewable. Shortly after, my power light would suddenly go out and then come back on after a minute or so. The problem got progressively worse until tonight it was off for most of the show I was watching and would come back on briefly. I popped the rear cover off and removed the metal shield and found most of the wires on one of the wire harness coming from the power supply board burned so badly the insulation was gone and the plastic connector assembly on the board melted. Because of the nature of modular board construction the power supply board and wire harness would need to be replaced and that doesn't necessarily mean the cause was fixed! To me this is a safety hazard. The TV is definitely out of warranty but I wouldn't expect this type of hazard problem. FYI, the parts I can read are made in China....what's new!