I give up
I spent to much time trying to flatten out the ground pad using a micro grinder.
For as hard as I tryed I can solder correctly only two sides at time, no more. To solve this issue I was thinking of some kind of riser for the contacts, but honestly it's too much effort for this laptop.
FYI removing the UE1 IC the laptop works as mentioned before. The wifi M2 slot does not work and, most important, the AC adapters are not recognized even if DELL original, so the battery cannot be charged.
Thanks everybody for the...
Fr4gz0n3
Member
Last Activity: 01-16-2024, 07:08 AM
Joined: 02-27-2022
Location: Turin
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Re: Dell E7470 - Do I need a programmer?
I can confirm the central pad is bumpy. I removed as much solder as I can and now I don't know what to do to flatten the surface. Maybe I can try with a fiberglass pen or a micro grinder as a last chance. Any idea?
...Leave a comment:
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Re: Dell E7470 - Do I need a programmer?
It's a good tip, but I'm worried the problem is the central ground pad to be not flat due to the original IC fused with the board. The area propably it's not clean and flat enough.Leave a comment:
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Re: Dell E7470 - Do I need a programmer?
Shame on me
I guess I found the problem
It took me a bit to capture this picture. Obviously I was on the opposite while I was soldering and probably I need a microscope. I wonder how it even boot up.
Tomorrow I'll remove the IC and try to find a way to flatten the surface. Any tips?...Leave a comment:
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Re: Dell E7470 - Do I need a programmer?
Yes I meant UE1.
Same procedure. The first time i used chipquik flux, the second time I used rosin+IPA because is tinner and flow better under the chip.
I confirm PR7 is ok: exactly 33 ohm
About PU1:
1 -> 3v
2 -> 0v (GND)
3 -> 3.3v
4 -> 3.3v
5 -> 5v
6 -> 1.7v (average)
Tomorrow I'm gomma test another AC adapter in case the one I have is faulty....Leave a comment:
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Re: Dell E7470 - Do I need a programmer?
Thanks for the reply. I'll check them ASAP.
Unfortunately the original PU1 melted into the first board layer, so the heatsink central pad surface is everything but even. After the soldering I also performed a reflow to have more chances of success.
Another problem I noticed is the M2 wifi board not detected by the bios. But I don't think the issues have something in common.Leave a comment:
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Re: Dell E7470 - Do I need a programmer?
I've made few tests with the AC adapter connected and without battery.
PD6 seems ok. I also tried to swap it with PD7 but nothing changed.
PQ3 and PQ4 also seem to be ok:
PQ3:
S -> 3.2v
D -> 3.2v
G -> 5v
PQ4:
E -> 0v (GND)
C -> 5v
B -> 0.4v <-- not sure about this
Readings of the resistors are correct. I cannot find one PR9 (or PR11) and PR10. It can be easier if I have the boardview file.
If it's not a problem with...Last edited by Fr4gz0n3; 10-27-2022, 12:38 PM.Leave a comment:
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Re: Dell E7470 - Do I need a programmer?
Thank you for the reply.
[LIST]
PQ802 seems fine. No shorts between source, drain or gate.[/LIST][LIST]
The battery is dead: 0v reading. On the 3 control pins I have:
PBAT_SMBCLK_C -> 3.3v
PBAT_SMBDAT_C -> 3.3v
PBAT_PRES#C -> 0v with battery | 3.3v without battery[/LIST]
I think the battery is detected correctly because if I remove it the system correctly reports that there is no battery. Do you think it can be simply a dead battery problem?
Can the dead battery problem...Last edited by Fr4gz0n3; 10-26-2022, 03:44 PM.Leave a comment:
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Re: Dell E7470 - Do I need a programmer?
Today I received and soldered the IC (ECE5048).
I also remove the 2 mosfets connected to the docking station power lines (PQ804 and PQ805). PQ804 was the one burned and pads at its location are missing due to the original short.
The good news is that now the laptop boots up and passes all the diagnostics, the bad one is that the AC adapter tests failed.
Now the machine goes in energy saving mode and show me the "infamous" warning: "Alert! The AC power adapter wattage and type cannot be...Last edited by Fr4gz0n3; 10-26-2022, 09:35 AM.Leave a comment:
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Re: Dell E7470 - Do I need a programmer?
Good news! Thank you very much
I ordered the new IC, let's hope the board is salvageable. The old one fused with the board because of the heat caused by the short, so had to push the hot air temperature quite a bit and for long time to be able to remove the IC.
The p mosfet is not replaceable as is because the pads burned and lifted. I'm thinking of removing both PQ804 and PQ805. I'm not interested in the docking station so it shouldn't be a problem. I'm just worried this action can cause problem on the board....Leave a comment:
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Dell E7470 - Do I need a programmer?
Hi everybody. I'm working on a Dell E7470 that does not power up.
I've found:[LIST]
A destroyed P mosfet (PQ804) connected to the docking station port power line[/LIST][LIST]
A shorted IC that if I'm right it should be the super IO (UE1)[/LIST]
I want to ask you if it's the super IO indeed and if, as I suspect, a new IC has to be programmed.
As always thanks.
Note: At first I thought that maybe a shorted capacitor caused the IC to heat up but it's not the case and after the removal of the IC all the shorts around the board disappeared.- Hi
Last edited by Fr4gz0n3; 10-21-2022, 04:19 PM. -
Re: Lenovo V110-17ikb - Shorted CPU?
Alas that's the sad truthLeave a comment:
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Re: Lenovo V110-17ikb - Shorted CPU?
As I suspected... bummer. Thanks for the answer.Leave a comment:
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Lenovo V110-17ikb - Shorted CPU?
Hi everybody, I'm back with another laptop to repair, but this time I'm not so confident it can be fixed
It's a Lenovo V110-17ikb 17" with an i7.
I suspect a short on CPU but I would like your opinion.
This is the current status:
- the bios battery was completely dead (0V)
- without laptop battery the board draws about 150mA from the power supply.
- the 19V main power rail is working correctly
- +3VALW and +5VALW are present
- power button and BIOS receives the 3.3v
- [B]When the PS is connected, the CPU warm up...Last edited by Fr4gz0n3; 03-30-2022, 03:35 PM. -
Re: HP G62-100SL "killed" by myself - No power
Thank you for the supportLeave a comment:
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Re: HP G62-100SL "killed" by myself - No power
Hi problem solved! Now the laptop is working correctly. I reflow the solder joins of the MOSFETs and the controller with the iron. Then the board started to work. So probably the problem was the step down controller damaged by my wrong actions. Maybe also one of the MOSFETs.
Thank you very much for your help and all the informations....Leave a comment:
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Re: HP G62-100SL "killed" by myself - No power
Thank you very much for the explanation.
So the internal 5V LDO is definitely working because we have +5ALW.
For the PWM part the 3.3v (+3VPCU) is working while the 5V (+5VPCU) is not.
From my understanding the reasons for +5VPCU to be missing are:
- [B]PU4 damaged, does not provide signal to the MOSFETs[/B]. This can be. As said I replaced it but it's not brand new.
- [B]PU4 is working but not receives the enable signal.[/B] This should not be the case because EN...Leave a comment:
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Re: HP G62-100SL "killed" by myself - No power
I'll try to be more specific in the future
The +3VALWP/+3VPCU is present (3.3v measured on PC302) while the +5VALWP/+5VPCU is missing.
I measured:
+3VALW -> 3.3V
+5VALW -> 5V
+10VALW -> 3.5V
+15VALW -> 7.2V
Can I ask you the difference between ALW and ALWP/PCU?
To be noted that the PU4 has been replace with a used one from the donor board so it's not guaranteed to be 100% working.
I forgot to mention that now I'm using the...Last edited by Fr4gz0n3; 03-20-2022, 04:04 AM.Leave a comment:
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Re: HP G62-100SL "killed" by myself - No power
Good news! Now the always 3.3v line is working. The problem was that the new step down controller was not soldered correctly. Probably 1 or more pins had bad connection.
To recap the current status:
- 19v main power line works. 19v arrives at the MOSFETs of the different power supplies
- Always 3.3v line is working correctly. 3.3v to the BIOS, the KBC and the power button
- Always 5v line still missing. Measured at coil PL5.
- Still no power consumption from the charger
- Still...Leave a comment:
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Re: HP G62-100SL "killed" by myself - No power
Today arrived the donor board. I swapped the two MOSFETs (PQ46 and PQ47), I've also replaced the IC PU4. Nothing seems to be changed. Voltages are the same as before and no charger led.
Always voltages (5V and 3.3V) are still missing (measured between the coils and GND).
Now I have also a bench PSU. I provided from 5v to 19v to monitor the current, but the board does not take any current.
It seems that some missing signal prevent the two switching power supply to turn ON.Leave a comment:
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