Dear Friends, I am working on Dell Latitude 5420 Motherboard LA-K491P Rev: 2.0(A01) ., Absolutely no power at all. I tried to find the schematics but I think it's not available. Upon observation I saw one chip ISL95860 burnt near the CPU, replaced it but still nothing. The Amp meter is totally blacked out, no display at all. When I connect the battery, at least on one of the battery terminal data lines pins there is 3.3v present. This board is using JHL8040R for each USB-C ports. Can anyone help where to start & if anyome can share the schematics, I would appreciate. Thanks in advance
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Read the posts in the LA-K491P schematic request thread https://www.badcaps.net/forum/troubl...ed#post3507736 , the LA-K371P is similar -
@SMDFlea, thanks, I have it with me, the layout & component are mostly different, I have no idea why they say that it's similar. Totally 2 different motherboards & this MB has only 1 USB-C portComment
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Hello,
You Connect a usb-c amp metter and you have no display at all?
Did the usb-c charger LED stop Lightning too when you plug charger in?
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My schematic for the LA--k491P has the TPS65994 onboard.
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You Connect a usb-c amp metter and you have no display at all? Like I said before... No Display on the amp meter, TOTALLY Blacked OUT.....
Did the usb-c charger LED stop Lightning too when you plug charger in? No power at all, this is why no LED activity at all. DEAD
If any repair tips given to me, I would appreciate.
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Yes mon2 you are right, TPS65994 is the PD controller on this motherboard. I got the boardview for this model but stil no Schematic, do you have the schematics to share with us.,trouble shooting will be easier. I have already shared the boardview in the schematics for LA-K491P thread.Comment
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Yes I do but in a locked PDF. Let me PM you.Comment
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You have boardview here, you don't need shematic for now:
https://www.badcaps.net/forum/troubl...-0-3-boardview
If amp metter stop working and your charger LED light off, you may have a big short somewhere, that's why I ask you these questions...
Don't forget to check if your USB-C connector are good too.
Then with the boardview you can check resistance to ground (without power) on your USB-C lines: CC1, CC2, VBUS .... then post values jere or make some conclusion.Comment
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@pc_okay., I checked all the USB-C ports & they look like new, no pins damage. I checked all the caps around TPS65994 & they are good. No Short. There is voltage of 3.3 to power on this chip. I am assuming that this chip is defective. I will replace & then inform you'll, thanks dear.Comment
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Hello.
I need help with a laptop Dell with LA-D801P motherboard.
The laptop completely died, no power, no leds.
The voltage of 19V is present at the output of the second mosfet.
The voltage on Pin 9 and 19 of PU102 is 0V.
Voltage on
PU100 :
pin2 =19v
pin11 =4.16v
pin12 =0.18v
pin17 =0v
pin19 =0v
I have 0 ohms on the coils PL100, PL301 and PL700.
If I remove pjp102 the short remains on the side of +3VALW.
Then I removed pjp501 and pjp801 but the short did not go to the integrated PU500 and PU800.
Then I checked... -
The motherboard is liquid damaged and the three capacitors and one mosfet is burned. I don't have a boardview or schematic of the Dell Latitude 7300 motherboard. Can someone tell me what voltage and amperage value capacitor can install and mosfet part number?
I forgot to take pictures before removing the capacitors, so the first two pictures are not from my motherboard.... -
Hello, I need schematic for dell 5531? Or if someone can identify PU4501, chip marking "R9E1D" (I dont know where to buy or how to identify part) controller for 3.3v. Motherboard Dell 5531 213002-1.
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Hello,
I've purchased 2nd hand Dell Latitude E7470 i7-6600U and it works fine, except ... there are no TPM or TXT/Trusted Execution settings in the BIOS/Firmware. However, looking at the schematics I found the chip handling TPM (NPCT650JA0YX) soldered to the system board. Also, looking at the service tag and the product specifications, this device comes with TPM (and vPro) support (I know that devices sold in China, Russia are not allowed to ship with TPM but this should be reflected in the service tag). I can also login to MBex to configure, etc.
In the produce specs...02-12-2024, 05:21 AM -
I'm desperatly looking for my desktop computer motherboard schematics, it is a dell optiplex 990 MT, number on the motherboard is Dell e93839 ka0121.
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