Dell Latitude 5530
Service Tag HYKFPT3
South Peak 15 MLK MB DDR4 203102-1 FK8VG$JA
Here's the long story about what I did.
The short story is I made a dump of the 32MB BIOS chip and tried patching it with the 8FC8 BIOS patcher to remove the admin password. After programming the chip with the unlocked BIOS, when I press the power button, only the power button light turns on for about 30 seconds and then turns off. I tried going back to the locked BIOS but still when I press the power button it does the same thing. Only the power button light turns on for about...
TopPop
Member
Last Activity: Today, 03:33 AM
Joined: 07-14-2014
Location: Shelley, Idaho
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I think I will return the XGecu T48. Unfortunately the ZIF socket usually doesn't work. I did get it to work a few times but each read of a chip I tried was completely different....Leave a comment:
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Original chip on the board:
Replacement chip on the board:
I guess I'm just uncertain about the lock of the dimple but maybe it really doesn't matter.
After I discovered that the motherboard wasn't working I was worried that maybe I broke some components near the BIOS chip off the board by using the pogo clip.
I found a boardview and schematics on this forum and downloaded them, also attached here. I was looking at the boardview and schematics and was worried I was missing R24B6. Then I remembered I took a pic of the...Leave a comment:
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I wondered about that. I was using this datasheet for reference so I thought 3V was OK. On page 92 of the PDF I see Product Number: W25Q256JVEIN, Top Side Marking: 25Q256JVEN which is the chip I have on the laptop motherboard.
NeoProgrammer auto detects the following:
I ordered a replacement chip from eBay and it has arrived but I noticed it is missing the pin 1 dimple. It just looks odd. I might just experiment with it and order another chip from someplace like Digikey....Leave a comment:
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Dell Latitude 5530 BIOS Password Removal Attempted but I Broke the Laptop
Sorry for the long story. I have a Dell Latitude 5530 (i7) laptop (South Peak 15 MLK MB DDR4 203102-1 FK8VG$JA) with an admin BIOS password that I want to remove. Service Tag: HYKFPT3. Other than that the laptop worked OK.
I found a CH341A Black and went looking for the BIOS chip on the motherboard. After trying to read one chip that was a firmware chip but not the BIOS I think I found the BIOS chip labeled Winbond 25Q256JVEN. Altogether I think I found 4 different firmware chips in the laptop. The BIOS chip is a WSON8 6x8. I used the CH341A, NeoProgrammer, and a cheap pogo pin clip... -
Re: Dell Precision M3800 won't turn on
I am chasing my tail. Now the board that was working is no longer working and also has the problem of switching itself off about 4 seconds after pressing the power button. Just before this started I pressed the power button, the keyboard backlight was flickering, and then after longer than 4 seconds the laptop shut off. Then the next time I tried the power button the laptop ran for only 4 seconds and shut itself off.
Also, the board I was originally working on, again, doesn't have +5VALW and +3VALW. This time PU300 isn't hot so...Last edited by TopPop; 03-21-2023, 08:26 PM.Leave a comment:
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Re: Dell Precision M3800 won't turn on
I replaced the resistor. It split in half as I took it off the board. After replacing the resistor the board still wasn't running. It still powers on for about 4 sec and then switches off with power only from the AC adapter. The MOSFETs PQ200 and PQ201 still weren't doing their thing. I referred back to piernov's 2.1.5. Missing Voltage On The Charger IC in the stickied Laptop Battery Charging Circuit thread and I had a look at https://cdn.badcaps-static.com/pdfs/...45f6294b0e.pdf Basically, I was missing CMSRC, so no ACDRV,...Leave a comment:
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Re: Dell Precision M3800 won't turn on
Actually, I haven't been in to Windows on this laptop. Just got in to the Dell Diagnostics. It is a pre-Windows thing.
VCC going in to PU200 is supposed to be about 19V. Also, I noticed that PR213 on the broken board looks a bit off. It's numbers on the surface are gone and the center has a light area. I measured its resistance and got 12.7K Ohms but the schematics say it should be 10 Ohms. Included is a pic of the bad resistor and a pic of a good resistor on the working board. Maybe this will help someone. The bad...Last edited by TopPop; 03-15-2023, 10:31 PM.Leave a comment:
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Re: Dell Precision M3800 won't turn on
Readings taken with charger only for power.
VCC is 2.9V
ACDET is 2.7V
ACOK is 0V
ACDRV is 0V
So with nothing coming out of PU200 on ACDRV the PQ200 and PQ201 mosfets don't do their thing. Do I have that correct?Last edited by TopPop; 03-14-2023, 09:49 PM.Leave a comment:
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Re: Dell Precision M3800 won't turn on
Hey, thanks for replying! Not sure why but I didn't get an email when you replied.
PU300 died for some reason. It was weirdly hot. That took out +3VALW and +5VALW. Got a replacement IC and put it on the board and now +3VALW and +5VALW are back. I checked that by checking the voltages from PL300 to ground and PL301 to ground.
Prior to PU300 dying I had the laptop running off the battery without the charger. If I had the battery and charger plugged in then the laptop ran and charged the battery. The only...Last edited by TopPop; 03-14-2023, 09:06 PM.Leave a comment:
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Re: Dell Precision M3800 won't turn on
Unfortunately something new went wrong. I no longer have +3VALW and +5VALWLeave a comment:
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Re: Dell Precision M3800 won't turn on
So after some more checking I found the laptop will now charge a battery from the AC adapter, will run off the battery, will run with the battery and AC adapter plugged in, but will not run from only the AC adapter. With only the AC adapter connected for power, if I press the power button, the light in the button turns on for about 4 seconds and then shuts off.
PQ102 was suspicious. It had 13.5V on the drain, source, and gate and the body diode seemed to be bad. I replaced it. However, that did not fix the problem of the laptop...Leave a comment:
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Re: Dell Precision M3800 won't turn on
I know I have +3VALW and +5VALW but I'm missing any fan activity and no screen graphics or backlight when the power button is pushed. I was looking at page 51 of the schematics. So I thought maybe I am missing +3VS and +5VS. I went looking for QZ8 but found that was removed and replaced by TI TPS22966 and some other components were added in as stated on page 50.
I went to page 34 and saw UZ4 also known as TPS22966. On the board it has +5VALW and +3VALW going to it but when I press the power button there is no +5VS and +3VS going...Leave a comment:
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Re: Dell Precision M3800 won't turn on
I got the replacement battery. The other working M3800 has no issues with the AC adapter that I've been using with the broken M3800. It charges the battery too. The problem with the non-working M3800 is not the AC adapter.Leave a comment:
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Re: Dell Precision M3800 won't turn on
The AC adapter I have probably isn't the original but it is one that is compatible with this laptop. I have another M3800 that is in a better working state than the one I've been working on. This second one reports that the battery has permanently failed. It has adapter warnings enabled in the BIOS setup and doesn't complain about the AC adapter. It boots in to Windows. I've ordered a battery replacement for this one. Should arrive early next week. Basically, I've tried this AC adapter with another M3800 and it seems to work though I admit...Leave a comment:
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Re: Dell Precision M3800 won't turn on
I got it back to where it belongs. See photo. Plus, I made sure there is continuity between the capacitor ends and pins 2 & 3 of U4 like there should be and I made sure I didn't short the capacitor somehow.
Though, that didn't fix the problem. I press the laptop power button and see a power light for about 4 seconds, no keyboard backlight and no screen backlight, and then the laptop switches itself off....Leave a comment:
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Re: Dell Precision M3800 won't turn on
A couple more pics. I think that's the best I can do for quality.
Maybe I need to just gently push the cap pad back in to its spot, reflow the connection points, and then get some UV setting conformal coating to keep it in place.
Or, I have some spare 10uF 25V 0805 caps. I could put one running diagonally from pin 3 to CT44's pad that is still on the board....Leave a comment:
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Re: Dell Precision M3800 won't turn on
I guess I somehow caused this damage while taking the board out and putting it back so many times. Looking at it, I think one pad is still in place on the board and the other pad pulled up with the capacitor but is still holding on to the board on one end and that is what is still holding the capacitor where I found it. Could I just solder it to pins 2 & 3 of U4? I'm going to check the connections of pins 2 & 3 just to be sure they are still connected to the things they are supposed to be connected to.
Edit: I just probed...Last edited by TopPop; 02-26-2023, 04:54 PM.Leave a comment:
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Re: Dell Precision M3800 won't turn on
I was probing around QV29 and QV30 and saw a messed up capacitor nearby. See attached photo. It is CT44....Leave a comment:
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Re: Dell Precision M3800 won't turn on
I put the motherboard back and reconnected everything except the battery. I see no graphics and no backlight. I press the power button, the light in the button comes on for about 4 seconds, and then it switches off. I've just been watching some videos and Googling some stuff. I guess the super IO chip is going through its component checks and finding something isn't good to go and switching off. I was looking at page 62 of the schematic specifically [AC in] 8th line down PBTN_SW# ...... 1ns < Tg < 4s Am I correct in thinking that everything...Leave a comment:
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