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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Hi All, I have a 9th Gen Dell Optiplex micro PC motherboard which doesn't power on. When I connect the motherboard with power adapter, it goes into safe mode and turns off. So from info I have gathered online, it looks like there is a short circuit on the motherboard. So can you guys help me with figuring out the issue?
I am new to electronics repair, so my queries could be naive but I am ready to learn.
So I have a multimeter and a solder with me. But I can try to get a variable voltage power supply with a thermal camera as well. From what I seen online, best way is... -
My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?
Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?
My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
I have tried multiple different Dell power adapters. My Dell... -
Hi everyone,
Does anyone happen to have the schematic (and if available also: the board view) for the Dell Precision 3650 Tower motherboard please?
Manufacturer: Dell
Model: Precision 3650 Tower
Motherboard markings:- IPRKL-RDT REV: A00
- D33D66
- CN-0NDYHG-PE100-1AM-05SY-A01
- P&Q 2134 CM-4 94V-0 E162264
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Hi, I'm new to laptop repairing, but not new to electronics. I just opened a laptop a friend gave me (no power) , and I was hoping for shorted main power rail , a bad capacitor or a bad dc-in mosfet. Up until now I haven't found a short or something obviously burned, the dc-in mosfets seem to work ok, the + on the big capacitors close to the CPU have an OK resistance to ground (around 14-15ohm) but following this thread here I connected the motherboard to the power brick to check the voltages. I didn´t do a lot of poking around when I noticed that the CPU was rather hot (over 55-60C to the touch).... -
Hello everyone,
I'm working on a repair for my Dell G15 motherboard (model GDL5L) and need two specific ICs to restore the functionality of the Embedded LED Controller (ELC). The missing components are labeled as UEL1 and UEL2 in the schematic, and they're both critical for LED control and system signaling. Here are the details:
1. UEL1
• Part Number: SA0000AWJ70
• Model: STM32F070CBT6TR_LQFP48_7X7
• Function: This microcontroller manages system signaling, power management, and SPI...
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