Dell N5110 Not Power ON

[shijeesh]

Dell N5110 not Power ON and charing not working.

[khaahk]

Re: Dell N5110 Not Power ON

Sad to hear that, mate. Take it to repair shop.

[shijeesh]

Re: Dell N5110 Not Power ON

When I press the power button power LED glowing at the same time OFF. The standby voltage ic TPS51123RGER-GP hot and 3D3V_AUX_S5, 5V_AUX_S5 voltages are normal but no 5V_S5 and 3D3V_S5.

[sparker1]

Re: Dell N5110 Not Power ON

If getting hot it may be shorted. What about removing it and checking pads for shorts. If no shorts replace TPS51123. The schematic is available here https://www.badcaps.net/forum/showthread.php?t=28239. Page 41 has the voltages for the various pins with 5V.

[sparker1]

Re: Dell N5110 Not Power ON

Now I have the same problem with a Toshiba A500 and TPS51117 getting hot and not having correct voltages.

[khaahk]

Re: Dell N5110 Not Power ON

If TPS is hot without pressing power button, then check VREG3 and VREG5 for shorts. VREG3 is more likely (EC, BIOS or LAN). If you have lab PSU, then use it.

[mohsin00]

Re: Dell N5110 Not Power ON

My n5110 got shorted when I was trying to fix my touchpad while the laptop was on. I accidentally dropped a small screw on the board and it died right away. After inspection i found out that there is no 3.3v_s5 or 5v_s5 but i did have Vreg3 and Vreg5 voltage. I also noticed the whole 3.3v_s5 rail is shorted. I lifted up the mosfets of TPS51123 and TPS51123 itself but still couldn't find the short. Can anyone help me with this stupid short which I can't find?

[reaper57]

Re: Dell N5110 Not Power ON

My n5110 got shorted when I was trying to fix my touchpad while the laptop was on. I accidentally dropped a small screw on the board and it died right away. After inspection i found out that there is no 3.3v_s5 or 5v_s5 but i did have Vreg3 and Vreg5 voltage. I also noticed the whole 3.3v_s5 rail is shorted. I lifted up the mosfets of TPS51123 and TPS51123 itself but still couldn't find the short. Can anyone help me with this stupid short which I can't find?

I think that you might be looking at an ICs short and not at a short in a MOSFET.
I recommend tracing the points that you shorted to the components they are attached to. And testing those if possible.
Can you also post pictures of the shorted area?

P.S. Have you tested the power supply? And what happens to it's output voltage when plugged into the laptop?

[shijeesh]

Re: Dell N5110 Not Power ON

3V_5V_EN this voltage is not stable sometime 0.9v or 1.09v .Normal voltage 3V_5V_EN ? What is the actual voltage of 3V_5V_EN.

[khaahk]

Re: Dell N5110 Not Power ON

This is a control signal to turn on SMPS, without it only the LDO outputs will have voltage. It should be at least 3.3V to turn the SMPS on, the logical low level can be anything reasonable below it. Look for short at VREG3 and VREG5. Have you measured resistance at these points?

[mohsin00]

Re: Dell N5110 Not Power ON

I think that you might be looking at an ICs short and not at a short in a MOSFET.
I recommend tracing the points that you shorted to the components they are attached to. And testing those if possible.
Can you also post pictures of the shorted area?

P.S. Have you tested the power supply? And what happens to it's output voltage when plugged into the laptop?

I did check other IC's as well but still no luck.

IC's that I checked by lifting them to find a shot are

TPS51311 = 1.8V_S0 (takes 3.3v_S5 as input)
TPS51116 =1.5v
ISL95831= VCC core
Bios
3.3v mosfet
5v mosfet
TPS51123 = only vreg3 and vreg5 voltages. I disconnected the 5v rail and 3.3v rail by lifting up the inductors. No short before the inductor though, I think the IC is gone( it gets hot when i plug the supply).

The capacitor on PCH(HM67) is also showing a short

I feel that HM67 is causing the short and considering removal of PCH (quite expensive here)

Any suggestion?

[shijeesh]

Re: Dell N5110 Not Power ON

There is no short at VREG3 and VREG5. Yesterday I got display but few seconds same problem, again I check this 5V_S5 and 3D3V_S5 is 0.5v only.

[shijeesh]

Re: Dell N5110 Not Power ON

Help me sir

[alihomee]

Re: Dell N5110 Not Power ON

just change two caps around 3v 5v ic if u can upload pics of that area i can point out that filters

[shijeesh]

Re: Dell N5110 Not Power ON

This is the VREG3 and VREG5 image.

[alihomee]

Re: Dell N5110 Not Power ON

ehat is the ic num

[shijeesh]

Re: Dell N5110 Not Power ON

5v/3d3v(tps51123rger)

[shijeesh]

Re: Dell N5110 Not Power ON

Sir please help me.

[hazardus]

Re: Dell N5110 Not Power ON

How do you know there is no short on VREG3 and VREG5?

[bluestone]

Re: Dell N5110 Not Power ON

have this same problem with dell Inspiron N5010 and N5030, tps chip get hot when charger is plugged in