I had steady light in my brick dell charger. In your case the led light comes for at least for a fraction of a second. I had no time to investigate further yet. I did some research and some other users said this chip TPS51120 can fail sometimes and others also said the maxim chip could be a culprit. With a multimeter I see juice flowing what makes me think i don't have a bad solder or power jack problem. I noticed when I connected the ac power or battery power, the chip TPS51120 gets very hot. i left bga problem aside on this one at first and decided look for bad caps or something else. The motherboard looks like was barely used, fan was clean, no lint, thermal stuff like new.
Now i have a M1530 that don't show any lights, no leds, no fan. I fixed last week a M1330 and it works amazing now as mentioned before. I am a beginner in repairing motherboards. Hence have to unplug the PSU from the mains and then it resets' again. but when attached back to the motherboard the PSU automatically trips. PS - I have tested the I/O power board disconnected from the motherboard itself and it does not kill the PSU LED. Please can you tell me which CAPS to look for and an approximation as to where they are located.? The mentioned "TPS51120" cannot even get hot because the fuse in the Dell PSU kicks in within 0.1seconds so I don't get a chance to test it. I do believe it is a CAP that is shorting but uable to identify. I have tested the PSU to 18.5V it works fine with other dells. I was going to consider reballing the GPU but held back after reading this forum as the M1330 is very similar to the - The power is instantly cut within a millisecond of plugging in the power lead, the LED on the PSU goes out immediately, no power lights light on the motherboard at all (not even the battery charging light if battery is plugged into the Mo'bo.) I have undertaken all the primary steps to debug a fault - removing unneeded PCI cards etc. On the side I do my own repairing, not essentially for the financial gains but more due to wanting to learn more with electronics. I working within a HP Company repairing insurance laptops for customers. Being my first time here, hence it certainly will not be my This may sound a little funny, but I am the local guy who fixes Laptops and Games consoles for a living.
First of all i have to say thank you to both of you for your fast response.
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