Hiii frnd i have nal60 la-5691p rev 1.0 motherboard in facing the problem when im press power on the power on led on but all motherboard not generates any one have any idea plz reply
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Does the Voltage Regulator ISL95859C supply +5 volt at pin 34 for the mosfet drivers or integrated Power Stages ?
https://www.farnell.com/datasheets/3109343.pdf -
Dear members,
I have an HP Elitebook 2540P laptop with mainboard: LA-5251P REV 1.0
It has a SIO with model: SMSC KBC1098
I think both the EC firmware and the main Bios reside in a single Bios chip.
Problem: KBC1098 is partially defective so that it does not generate ADP_En at Pin 75 and generates 8 amber blinks on the charging LED, indicating some wrong input.
Idea: Now I need to modify the EC firmware so that KBC1098 ignores the wrong input conditions and always generates a high ADP_En and does not enter a failure state.
Is it possible...05-21-2024, 01:35 PM -
Hello,
I have a Lenovo Ideapad 3-15ALC6 computer that I'm trying to repair.
Initially, the computer wouldn't start, and there was no power consumption from the charger. The board itself is reference HS261&HS561&HS761 NM-D521 rev 3.0, where you can find the schematic and board view here: https://www.badcaps.net/forum/troubl...-hs761-nm-d521
When I opened it, I noticed three burnt components near...10-26-2025, 10:27 AM -
Hi, all
LA-L191P BQ24781 signals pin 28 -> 19V [VCC], pin 5 -> 3.3V [ACOK] pin 6 [ACDET] 2.6V, pin 24 -> 5.3V [REGN], pin 25 -> 5.3V [BTST] ,
missing +3VLP -> EC -> signals for manage BQ24781. In the power sequence the +3VLP is the first signal in AC mode.
I presume that the bios is working because one time the motherboard generate +3VLP and goes ON but after a shutdown the situation
came back to no power on -> no main 19V. The question is: who generates +3VLP which is the basis of all other signals?
Every time with the BQ24780S it's like... -
Hello everyone. I received an HP 15-cx0054ur (DPk54 LA-F841P Rev:1A) with a problem - it won't turn on. During the inspection, I found a faulty chip marked 8AAB0G , but I couldn't find any information about it. In the board viewer, it is marked as PUH1 , but I don't have a full schematic. According to the board viewer, this is a power controller that generates +0.95VS_VCCIO . If anyone has an alternative marking for this chip, a partial schematic with it, or any other information, I would be very grateful .
LA-F841P Boardview - https://www.badcaps.net/forum/troubl...-hardware-devi...
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