Dell n5010 dead tps51116 not working

[laci200270]

Hello everyone!When I plugged my laptop to a the scren sowed some weird artifacts, then shut off.I powered it on again, then shut off again.DOne this a few times then the laptop wouldn't turn onand the charger light come off, so the laptop was shorted.Few months later checked at a friend who got a lab psu the TPS51116 ic was shorted, and also the two fets belonging to it.Foast forward to now I got a hot air rework station(858D kind) replaced the IC and the FETS but still no 1.5V_SUS and the laptop beeps seven.Also there was a horted tanutlum cap on the line, and something else ws shored also but I don't know what because when I injected 1 amps it just vanished(maybe burned away).Anyone can help me maybe?

[caspian]

Re: Dell n5010 dead tps51116 not working

which power rails are missing in addition to 1.5V_SUS?

[laci200270]

Re: Dell n5010 dead tps51116 not working

5.5V and 3.3V present for sure, comnputer sometimes turns on, sometimes not, but when turns on VCORE is also present.I made some pictures with my phone( sorry for crappy quality also included a brightened image and also incrased contrast)Are these solder joints looking good?And some compents are missing from there.Shall they be there?according to the schematics they are for the enable signals. This was my first QFN chip i i I cooked 2 of them, almost ripped a pad, but restored(3 GND) also 0.75V missing.GPU and CPU heats up when computer turns on.

[caspian]

Re: Dell n5010 dead tps51116 not working

assign fixing the missing components to another time. For now, I see that the TPS51116 IC is not aligned properly on the pads. some pins seem even shorted together. thus, do not connect power to this mainboard until you fix the soldering mistakes. to learn such a soldering job, practice on a number of failed mainboards.

[laci200270]

Re: Dell n5010 dead tps51116 not working

Hi!
Tried to correct the soldering issue hope it is better now!
The EN resitor is missing if I iuhnderstand correctly what shall I put there?

[caspian]

Re: Dell n5010 dead tps51116 not working

If you mean PR5007, it is a 0ohm resistor.