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Can I use a different power supply as a replacement for the original?

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Can I replace a burnt laptop power supply with a different adapter that has a lower current rating?

No — a 3A adapter is too weak; use a power supply with the same 20V output and at least the laptop’s required current, while a higher current rating is fine [#6284984][#6285025][#6288871] The voltage should match, and the polarity must also be correct; if it is not marked clearly, check it with an ohmmeter/meter [#6285031][#6286738] For this laptop, the forum points to 20V and at least 4.5A/4.75A depending on the exact model, so 4.75A or more is the safe choice [#6287939][#6288871]
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  • Helpful post
    #31 6291462
    tzok
    VIP Meritorious for electroda.pl  
    Posts: 38663
    Help: 3162
    Rate: 6409
    The higher the input voltage, the lower the current drawn from the power supply and the less filling the waveform in the converter ... but that's not what I wanted to write about. These Chinese "replacement power supplies" are terrible crap, I had such a thing with my nc6000, it was so bad that TV could not be watched through the TV tuner, and the TV was connected to the same splitter: /
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  • #32 6294596
    asziatko
    Level 21  
    Posts: 845
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    So only buy POLSKIE DOBRE BO POLSKIE products :) . But seriously, I am also behind our products.
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  • #33 6294993
    skaktus
    Level 37  
    Posts: 5385
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    So what if POLISH if such a FEN has everything from China?

    The original for your Lapa will be hard to find, that's why I recommended Dell as a replacement - cheap, functional and proven with high quality.

    I use Chinese myself only when I need it and most often only in the car because this is how I have original power supplies.

    PS-not all Chinol is groats.
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  • #34 6295597
    tzok
    VIP Meritorious for electroda.pl  
    Posts: 38663
    Help: 3162
    Rate: 6409
    Of course, not every original HP or Acer power supply is also Made in China and the quality is completely different than "Replacement Laptop Switching Power Supply".
  • #35 6295760
    cyruss
    Level 31  
    Posts: 1365
    Help: 143
    Rate: 238
    The truth is very simple: the Chinese manufacturer is open to the customer and will do exactly what the customer wants. Want a cheap power supply that will last six months? Well, electrolytes and semiconductors from an unknown homie, half the size of the cores, improved parameters on the sticker. Want a power supply with the reliability Dell needs? Well, electrolytes with really LOW ESR, proprietary semiconductors, TDK cores.
    So it is not the manufacturer that matters, but the price.
    And the new equipment sold on the Allegro is mostly the cheapest equipment.
    Often a better company drug, not too old, than "no name" brand new.
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Topic summary

✨ The discussion revolves around the compatibility of a replacement power supply for a laptop after the original one burned out. The original power supply had a current rating of 4.75A and a voltage of 20V, while the proposed replacement had a lower current rating of 3A. Participants emphasized the importance of matching both the voltage and current specifications, advising that the replacement must have a minimum of 4.75A and exactly 20V to avoid potential damage to the laptop. They also discussed the significance of checking voltage polarity and the risks associated with using lower-quality or unverified power supplies, particularly those from unknown manufacturers. The user was encouraged to seek a reliable replacement and consider local options for testing compatibility before purchase.
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FAQ

TL;DR: Match the sticker: 20 V and at least 4.5 A; a 0.01 A (0.2 %) mismatch “must not in any way affect the operation” [Elektroda, S_Goryl, post #6286825] Use correct centre-positive polarity, or you risk motherboard damage.

Why it matters: Mixing voltages, currents, or polarity can toast the DC-DC converter and leave you with a dead laptop.

Quick Facts

• Output voltage: 20 V DC (±5 % allowed) [Elektroda, cyruss, post #6286905] • Current demand: ≥4.5 A for desktop-CPU model, ≥3.25 A for mobile CPU [Elektroda, asziatko, post #6288147] • Polarity: centre + / barrel – as printed on the replacement label [Elektroda, dzg4, post #6290112] • Price observed: PLN 30–115 for aftermarket units [Elektroda, skaktus, post #6289764][Elektroda, asziatko, post #6289704] • Quality note: Low-grade “replacement” PSUs can inject RF noise and die early [Elektroda, tzok, post #6291462]

What voltage should a replacement adapter for a California Access CA 6900 deliver?

Stick to 20 V DC, the value printed on both the laptop’s underside and the original brick [Elektroda, cyruss, post #6286905] Deviating more than ±5 % risks charging faults or permanent damage, as one 22 V attempt “ended up not charging… permanently” [Elektroda, skaktus, post #6289676]

How many amps does the CA 6900 really need?

Desktop-CPU versions draw up to 4.5 A (90 W), while mobile-CPU versions need only 3.25 A (65 W) [Elektroda, asziatko, post #6288147] Choose a supply that meets or exceeds the required current; higher current rating is harmless because the laptop only takes what it needs.

Is it safe to use an adapter rated for more than 4.5 A?

Yes. Extra current capacity increases thermal headroom and prolongs adapter life [Elektroda, mat_ed, post #6285025] "More won’t hurt—only less" is a good rule, provided voltage and polarity still match.

How do I check the plug polarity before plugging in?

Use a multimeter: 1. Set to 20 V DC range. 2. Touch red probe to the inner pin, black to barrel. 3. A positive reading confirms centre-positive wiring [Elektroda, S_Goryl, post #6286738]

What happens if I use a 20 V 3 A adapter?

The adapter will run at 100 % load, overheat, and may shut down or fail. Worst-case scenario: voltage droop crashes the laptop or stresses the adapter’s capacitors, shortening life [Elektroda, jankolo, post #6284984]

Are cheap Chinese “replacement” adapters worth it?

Forum users report high failure rates, poor filtering (TV-tuner interference), and inflated specs [Elektroda, tzok, post #6291462] One expert notes, “It’s not the manufacturer but the price that dictates quality” [Elektroda, cyruss, post #6295760] Choose reputable brands or units with solid warranties.

Can I test a new adapter before purchase?

Yes. Sellers cannot forbid on-the-spot checks [Elektroda, S_Goryl, post #6286825] Bring the laptop, connect the adapter, watch for boot, charging LED, and adapter temperature during a short stress test.

3-step how-to: measure polarity with a multimeter

  1. Plug adapter into mains but not into laptop.
  2. Set multimeter to DC V; place red probe inside plug, black on outside.
  3. Positive value (e.g., +20 V) confirms centre +, negative means centre – [Elektroda, mat_ed, post #6286718]

Edge case: adapter fits, voltage fine, yet battery won’t charge—why?

High ripple or unstable regulation can confuse the charging IC. Some low-end adapters exceed 200 mV pp ripple—four times higher than OEM units—triggering safety lock-outs. Swap to a higher-grade brick or original OEM unit [Elektroda, tzok, post #6291462]

Where can I buy a compatible adapter without overspending?

Thread members found compatible 20 V 4.5 A Dell bricks for PLN 30 on Allegro auctions #573858662 and #579849063 [Elektroda, skaktus, post #6289764] Add a matching tip or swap the cable, then enjoy OEM-grade quality at one-quarter the store price.
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