Alienware 15 R2 Service Tag: DL7NN32 ISSUE (Battery is not charging)

[Simone Vergani]

Hello everyone,

I'm experiencing an issue with my Alienware 15 R2 (Service Tag: DL7NN32). The laptop works perfectly when connected to the AC adapter — it powers on and functions normally. However, the battery does not charge. If I disconnect the DC adapter, the laptop shuts down immediately, as the battery is at 0%. I have replaced the battery with a new compatible one, but the issue persists. I also replaced the AC adapter with a compatible one, but the battery still doesn't charge.

To assist with troubleshooting, I'm attaching two power circuit schematics:

• Power Circuit 1 (Initial schematic showing the battery and DC jack connections)
• Power Circuit 2 (Detailed power circuit diagram)

I'm relatively new to reading these schematics, and I would greatly appreciate it if someone could help me understand the COMPAL nomenclature used in the diagrams, such as: BATT++, VIN, B+, P1, P2, CHG_B+, etc.

Additionally, I've disassembled the laptop and noticed an odd component that seems to be damaged. On the schematic, it's labeled as PL701, and it appears to be burnt. I've attached a photo of it as well.

If anyone can offer insight into whether the issue is related to a MOSFET, capacitor, inductor, or if the damaged component might be causing the charging problem, I would be immensely grateful for your help in resolving this issue.

Thank you so much in advance for any assistance!

Best regards,
Simone

[mon2]

What is the LA-**** number on the silk screening of your board? This will identify the possible schematic we need to review.

[Simone Vergani]

Then the full name of the motherboard is: AAP20 LA-B753P Rev: 1.0 (A00)
Thank you so much!

[Simone Vergani]

For information, I attached the power supply circuits in the previous message (pdf file) but in any case in the schematics file they are found on pages 58 and 59. (I attach the complete diagram in pdf)

Link to schematic - https://www.badcaps.net/forum/troubl...753p-schematic

[Simone Vergani]

What is the LA-**** number on the silk screening of your board? This will identify the possible schematic we need to review.

Any News?

[mon2]

This is a Dell so the adapter must present a working PS_ID signal line. This 1-wire interface is used to announce the capabilities of the power adapter. In the absence of this signal, the adapter will be treated as a weak unit that is not capable of charging and the CPU speed will also be throttled.

What does the BIOS report on the power rating of this adapter? You must be using a 240W rated power adapter and it must be from Dell / Alienware else the PSID line will be missing.

Measure the voltage to ground on PL2 (either side) with the power adapter connected. Post the measurement.