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Dell Inspiron 15 5558 is a Windows 10 Home laptop with a 15.60-inch display that has a resolution of 1366x768 pixels. It is powered by a Core i5 processor and it comes with 8GB of RAM. The Dell Inspiron 15 5558 packs 1TB of HDD storage. Graphics are powered by Intel Integrated HD Graphics 5500. Connectivity options include Wi-Fi 802.11 ac, Bluetooth, Ethernet and it comes with 3 USB ports (2 x USB 2.0, 1 x USB 3.0), HDMI Port, Mic In, RJ45 (LAN) ports.

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How to diagnose a failing component on a motherboard?

Dear all,

Recently I inherited this laptop. The problem is that when I boot it on, there are two beeps on loop and the laptop didn’t boot on. According to the Dell website, those beeps mean that there is no ram installed. I tried with some different RAM sticks among the other RAM slots, but there is always two beeps no matter what, so I imagine that the problem is on the motherboard.

I have a multimeter at home, but I have no clue how to diagnose the motherboard to find the component that is failing.

Can anyone give me some advice?

Thank you very much.

These are the pictures of my motherboard:

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Hi @acallejp_97 ,

As you said a 2 beep error code is no ram or faulty ram.

If you have tried known working compatible ram modules and it still fails then perhaps the first thing to check is if there is voltage being applied to the ram slots so that they can function and communicate with the chipset.
The schematics show that the ram slots are tied directly to the chipset. (See block diagram on p.1 of the schematic, linked below).

Here are some images taken from the schematic that may help

Given how close together the contacts are in a ram slot, initially it may be safer to test that the ram voltage supply is on the motherboard before checking to see if it appears at the ram slots. (see p.48 and p.96 for further information about 1D35V_S3 & DDR_VREF_S3 voltages)

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(click on image to enlarge)

Hopefully a start.

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Dear @jayeff,

Thank you so much for your reply. I will try my best to check your proposal today in the afternoon. I will come back later with any conclusion.

Thank you :)


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