Green Probe
Member
Last Activity: 03-24-2025, 05:32 AM
Joined: 02-04-2024
Location: Little Rock, AR
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Sorry to revive an old thread, but how does one open a .cad file? -
Latitude 5530, 203102-1, South Peak 15 MLK MB DDR4, i5 12th Gen
Hi, I'm looking for a schematic and/or boardview for a Dell Latitude 5530. The motherboard is marked "South Peak 15 MLK MB DDR4, 203102-1, FK8VG$LA" I think it's the i5 12th Gen. I'm trying the similar 5520 schematic, but things are shifted around, making it a bit tough for me to find things. This might not be the place to discuss the issue, it shows no life. It consumes 5V1A when plugged into the USB-C charger. Main rail is present at 16.75V, and 4.2V is present at some locations. Any help is appreciated. Thanks! -
Available part compatible with MP86941
Hi all! I'm looking for a MP86941 "Intelli-Phase Solution", and there is only one guy on ebay that has them in the U.S. Is there a cross-compatibility search-engine for these, or does anyone know of a more available compatible part?
For reference, this is a part for an Alienware LA-761P Rev1.0 motherboard, supplying the CPU.
Thanks for any input you have! [URL=filedata/fetch?id=3289435&d=1718267293][ATTACH=JSON]{"alt":"Click image for larger version Name:\t20240612_054828.jpg Views:\t0 Size:\t2.99 MB ID:\t3289435","data-align&q... -
Forgive me if I'm missing something obvious, as I'm still learning to read schematics. I'm having a hard time making sense of the EC pinout. My board has ENE KB9542Q-E with 128 pins, while the schematic shows a KB9542G-B_VFBGA124.
The only mention of a source for SUSP# seems to be from EC Pin 116 Output in the Power Sequence (Page 5). And mentioned again on EC Pin B7? (Page 58)
When testing resistance from U10 Pin 5 to the EC, the lowest I get is 2.5 ohms to EC Pin 74.
GND to EC Pin 74 is 90.6k.
U10 Pin5 to EC Pin 116 is 140.5k
GND to ECC Pin 116 is 11.7k...Leave a comment:
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Thank you for your response, Mcplslg123. Here are the readings to GND, as well as a pic of the area the heatsink was covering.
[ATTACH=JSON]{"data-align":"none","data-attachmentid":"3222385","data-size":"medium"}[/ATTACH]
U10
1,2= 4.72k
6,7= 4.78k
8,9= 2.2m
13,14= 3.45k
U2
1,2= 1.86k
3= 3.4m
4= 4.71k
5= .1
6= 5.73m
7,8= 8.67k
U1
1,2= 57.7
3= 4.74k
4= 3.33m
5= 0
6,7,8= 917
U20...Leave a comment:
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HP Envy x360 m, 15m-ee0013dx, GPR51 LA-J493P r2.0, Won't Power On
Hello wise friends,
I have a HP Envy x360 m, 15m-ee0013dx, with motherboard GPR51 LA-J493P r2.0 that will not power on. When connected to AC power the charging light turns on to white with no battery, and orange with the battery. When I press the power button I hear a faint click and the charging light turns off for a second, then it turns back on. When the charging light turns off for a second, the powered rails stay on.
I forgot to note that with no battery, no AC, resistance to ground at PRB1 is 147k ohm.
With the battery and AC plugged in, PLB1 goes up to 13v to charge... -
I agree that ergonomics helps a load. I found it a lot easier to use the hot air in my secondary hand, and the tweezers in my primary hand. It took a second to get used to, but having my primary hand do the fine work is worth it. I find it easier holding the tweezers with the base of them resting on top of my hand, like holding a pencil or chopsticks; instead of the base of the tweezers being in my palm like holding tongs. Lowering my chair helps too. Watchmaker's workbenches are armpit height, so there has to be some advantage to it for fine work. They also commonly have arm rests, which you...Leave a comment:
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Well, I must be the luckiest noob around.
Using you guys' advice I kept looking for the short. I looked several times with my thermal camera, but it was only consuming 1V@10mA, so not much heat. After a lot more troubleshooting I tried the camera again, and found the faintest glow coming from the 19v pins on the EDP connector. The liquid damage had affected that area the worst, and some of the solder mask had flaked off leaving a bare trace, so I kept assuming it was a reflection. Turns out 2 of the 19v pins from the EDP cable were stuck inside the EDP connector. I removed the...Leave a comment:
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Mcplslg123, thanks for the advice. I did as you said, but it only consumes 12mA. After voltage injection the resistance on the system side of PRB4 dropped to 72ohms. I can't find a heat source with the thermal camera.Leave a comment:
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Alienware m15 R5 Ryzen No Power
Hello, I have an Alienware m15 R5 Ryzen, P109f002, with motherboard GDL56 LA-K453P Rev:1.0, Ryzen 9 5900HX, RTX 3070. I got it due to it having liquid damage. I am quite new to chip-level repair, and this is my second post, so please be kind with my incompetence. The charging IC is an ISL95522ah in HPB mode as far as I'm aware. I've been using a schematic for a LA-K455PR10_0525A that is available in the forum, and it seems to match for the most part. If it's okay I can link the schematic, or insert the pertinent page into my post.
It had some crusty areas that I've cleaned up.... -
Thanks a million (ohms)! I have a feeling the liquid damage is more extensive, but this is definitely a good start. I've been using a JBC C210 knockoff soldering iron, and it seems to work a treat with the small stuff. I'm sure it won't be long before I'm back with more embarrassingly basic questions. Thanks again, mon2!Leave a comment:
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Hey guys, I'm new and have an incredibly stupid question, but I'm second guessing myself. I'm working on a laptop charging circuit on an Alienware m15 R5 Ryzen, Mobo LA-KB9542 that has had water damage. The schematic is showing the CSIN and CSIP resistors as 1_0402_1%. That does mean they are 1 ohm resistors, right? I'm getting 6.7m and 1.9m on them, and it seems suspicious for two resistors labeled as such. Any advice would be greatly appreciated!
[ATTACH=JSON]{"alt":"Click image for larger version Name:\tresistors2.png Views:\t4 Size:\t140.1 KB ID:\t3210...Leave a comment:
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Hey folks, nice place you got here. I go by Green Probe cause I'm new to chip level repair. I've done computer repair for some years, but just replaced bad components instead of fixing them. Then I started replacing soldered power jacks on laptops, and really grew to enjoy soldering. Over the past few years I have grown interested in chip level repair. I found the forum through it being a common destination of my search for information. I'll definitely be on the receiving side of the information exchange most times, but I hope to be helpful when I can. Nice to meet you all!Leave a comment:
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