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はじめに

Samsung Electronics launched a new family member for its Galaxy A series: The Galaxy A51. The expectations for this new mid-range smartphone are huge, after all the predecessor—Galaxy A50—was one of the most successful smartphones Samsung released in 2019. Can the successor keep up? A teardown might be the only way to find out!

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この分解は修理ガイドでは ありません。 お持ちのSamsung Galaxy A51を修理する際は、iFixitの修理ガイドをご利用ください。

  1. The specs may not impress at first sight, but there's quite a lot here for the price: 6.5" Super AMOLED capacitive touchscreen (1080 × 2400px) and Infinity-O Display 48 MP ƒ2.0 main camera, 12 MP ƒ2.2 ultra wide camera, 5 MP ƒ2.4 macro camera for close-ups and a 5 MP ƒ2.2 depth camera for multiple live focus effects; 32 MP ƒ2.2 front-facing camera
    • The specs may not impress at first sight, but there's quite a lot here for the price:

    • 6.5" Super AMOLED capacitive touchscreen (1080 × 2400px) and Infinity-O Display

    • 48 MP ƒ2.0 main camera, 12 MP ƒ2.2 ultra wide camera, 5 MP ƒ2.4 macro camera for close-ups and a 5 MP ƒ2.2 depth camera for multiple live focus effects; 32 MP ƒ2.2 front-facing camera

    • Exynos 9611, octa-core (4×2.3GHz Cortex-A73, 4×1.7GHz Cortex-A53)

    • Built-in storage: 64GB/4GB RAM, 128GB/4GB RAM, 128GB/6GB RAM

    • Android 10.0

    • Fast wired charging with 15W

    • USB-C and a nearly extinct 3.5 mm headphone jack

    • The back cover shines like glass, but it's a ruse! It's plastic—perhaps a cost-saving measure? Whatever the reason, we're happy to see it. This plastic makes the A51 less shatter-prone than the glass-backed Galaxy S phones.

    • Plenty of heat from our iOpener softens the adhesive and we can start battling our way in.

    • And we come through it unscathed! The back side lifts off cleanly (with a little gentle force). No booby-trap cables here.

    • An unlucky 13 Phillips screws later we can release the midframe from its captivity.

    • This plastic midframe houses the NFC antenna (among a handful of other antennas), the volume and power buttons and the speaker on the bottom.

    Where is the Bluetooth antenna located? The A51 unfortunately has a weak BT antenna, which causes the reception to not work/stutter with some devices (especially AirPods). Very many people have this problem. If one knew where the antenna was located, one could at least cut a 'hole' into the case/sleeve... ;)

    - - -

    Wo sitzt denn die Bluetooth-Antenne? Das A51 hat leider eine schwache BT-Antenne, was dazu führt, dass der Empfang bei manchen Geräten (insbes. AirPods) nicht funktioniert/stottert. Sehr viele Leute haben dieses Problem. Wenn man nun wüsste, wo die Antenne sitzt könnte man zumindest behelfsmäßig ein ‘Loch’ in die Hülle schneiden… ;)

    Frank - 返信

    (The problem only exists if the mobile phone is in the case)

    - - -

    (Das Problem besteht nur, wenn das Handy in der Hülle steckt)

    Frank -

    Not sure if cutting a hole in the case might do the trick. There are a few complaints about the Bluetooth power in the A51 in general. For some the issue is solved by getting the latest Android Update.

    https://eu.community.samsung.com/t5/Gala...

    The Bluetooth antenna could be one of the many orange “circuits” running on the front and back of the plastic midframe shown in this step (see last picture for the other side of the midframe).

    Tobias Isakeit -

    After extensive testing with my Galaxy A51, I figured out that the bluetooth antennae is right above the cameras. I cut a hole into my case where the antennae is, and my bluetooth now works much better.

    Oliver C - 返信

    Mine works fine with a case on i have a rinke fusion x pick one up

    zeus dude 89 -

  2. Samsung sends the A51 into the selfie-race  with a 32 MP ƒ2.2 front camera. That’s a 7 MP increase from its predecessor—quite instagrammable. For comparison: The iPhone 11 Pro Max’s rear and selfie cameras provide 12 MP each while the Samsung Galaxy Note 10+ offers 16 MP/12 MP for the rear cameras and 10 MP on the front. But more doesn’t always mean better.
    • Samsung sends the A51 into the selfie-race with a 32 MP ƒ2.2 front camera. That’s a 7 MP increase from its predecessor—quite instagrammable.

    • For comparison: The iPhone 11 Pro Max’s rear and selfie cameras provide 12 MP each while the Samsung Galaxy Note 10+ offers 16 MP/12 MP for the rear cameras and 10 MP on the front. But more doesn’t always mean better.

  3. Just like its predecessor, the A51 also features an optical in-display fingerprint scanner which is placed near the daughterboard. Optical fingerprint sensors work by illuminating the finger and taking an image of the bright and dark areas representing the ridges and valleys of the fingerprint. (More on fingerprint sensor technology.) The daughterboard comes out without a fuss and brings the USB-C plug and the beloved 3.5 mm audio jack to light.
    • Just like its predecessor, the A51 also features an optical in-display fingerprint scanner which is placed near the daughterboard.

    • Optical fingerprint sensors work by illuminating the finger and taking an image of the bright and dark areas representing the ridges and valleys of the fingerprint. (More on fingerprint sensor technology.)

    • The daughterboard comes out without a fuss and brings the USB-C plug and the beloved 3.5 mm audio jack to light.

    • A dedicated audio jack reduces wear and tear on the USB-C port, which is nice. Both ports are soldered in place though, so replacing one individually will require soldering skills.

    • That said, this configuration is better than the single-board Galaxy S10! At least this tiny daughterboard can be swapped out with relative ease should one or both ports fail on you.

  4. The motherboard is held down by just one screw. Once it's out, we start plucking up the cameras right away. Although the A51 is a mid-range smartphone, its camera setup can supposedly keep up with the more expensive ones. Samsung claims that its four cameras ensure perfect everyday photography. Starting at top left:  a 12 MP ultra wide cam,  a 48 MP main cam, a  5 MP depth cam, and last but not least the 5 MP macro cam on the bottom left.
    • The motherboard is held down by just one screw. Once it's out, we start plucking up the cameras right away.

    • Although the A51 is a mid-range smartphone, its camera setup can supposedly keep up with the more expensive ones. Samsung claims that its four cameras ensure perfect everyday photography.

    • Starting at top left: a 12 MP ultra wide cam, a 48 MP main cam, a 5 MP depth cam, and last but not least the 5 MP macro cam on the bottom left.

  5. Let’s see what goodies we can find on the motherboard: Micron MT53D1024M32D4BD-046 LPDDR4 memory covering the Exynos 9611, octa-core CPU with Mali-G72 MP3 GPU
    • Let’s see what goodies we can find on the motherboard:

    • Micron MT53D1024M32D4BD-046 LPDDR4 memory covering the Exynos 9611, octa-core CPU with Mali-G72 MP3 GPU

    • KLUDG4U1EA-B0C1 128GB UFS 2.1 flash storage

    • Realtek ALC5665 Audio Codec

    Do you happen to know the part number for the motherboard / main pcb shown above?

    Gage V - 返信

  6. The other side reveals: S537 609651 G1944Y55 (likely a power IC)
    • The other side reveals:

    • S537 609651 G1944Y55 (likely a power IC)

    • Qorvo QM58110 Envelope Tracking

    • S925D2 Intermediate Frequency Chip

    • NXP PN553 NFC controller

    • fkGDB 390486

    • Skyworks SKY77786-11 High Band Multimode Multiband Power Amplifier Module

    • Samsung S2DOS15 Display Power Management

    مرحبا

    ما هو سعر الخارطه الموبايل وانا من العراق

    البحار العراقي - 返信

  7. In line with other recent Samsung phones, the battery squats in a little pit of glue-lined sadness with no pull tabs, but we quickly set to work digging it free with heat and a plastic card for some leverage. The A51 features a Li-ion 4000 mAh battery, the same as the A50!
    • In line with other recent Samsung phones, the battery squats in a little pit of glue-lined sadness with no pull tabs, but we quickly set to work digging it free with heat and a plastic card for some leverage.

    • The A51 features a Li-ion 4000 mAh battery, the same as the A50!

    • Now that the battery is out, we can compare it to its competitors! Fully topped off, this 3.85 V, 4000 mAh cell will deliver up to 15.4 Wh of power. That’s more than the iPhone 11 Pro Max with 15.04 Wh and only slightly less than the 15.79 Wh battery in the S10+.

    • With the phone empty we turn to the screen... and it puts up a real fight!

    • After an initial round of heating, we didn't get very far with our Opening Picks before we heard that dreaded noise...

    • Crack!

    • Like all Samsung phones, the A51's screen is strongly glued to the frame. There's a reason that Samsung sells screen replacements pre-adhered to brand new frames, and this is it!

    • The good news is once you crack it, you can't go back! The rest of our removal procedure is infinitely less stressful. We use a Plastic Card to carve away the rest of the screen.

    • Once we finally break it free, we find the culprits: two thick adhesive strips that cover a large area of the screen.

  8. This is it! The battle is over, the screen is broken, the adhesive is beaten. We retreat to our corner and prepare for the next battle.
    • This is it! The battle is over, the screen is broken, the adhesive is beaten. We retreat to our corner and prepare for the next battle.

    • But no need to be sad. We've prepared a nice souvenir for you. Here you can download a see-through teardown wallpaper for your Galaxy A51.

    • Feast your eyes on all the bits and stay tuned for a score.

  9. まとめ
    • A single Phillips driver takes care of all the screws.
    • Many components are modular and can be replaced independently.
    • The plastic back cover is glued in place, but can be removed fairly easily with heat.
    • The battery is accessible but heavily glued in place.
    • Screen repairs require a lot of disassembly while battling tough adhesive.
    リペアビリティのスコア
    4
    10点中4点のリペアビリティ
    (10点が最も修理しやすい指標です)

17 件のコメント

I enjoy what I read

Egbesu Kingsley - 返信

Why does Samsung glue their batteries in place? Seems like they do it on purpose to make you upgrade, and now the screen is glued too.

cyberjays - 返信

That’s the idea. They make it possible to repair but they also make it very difficult to repair to stray most from attempting it. I miss the days of removable batteries and phones with jacks on them.

Jesse -

A heat gun, and low heat will make quick work of it. Just dont blow it up with high heat

Deanna Thackston -

If you think that’s bad, try repairing an iMac. They glue the SCREEN to the computer itself, to discourage you from opening it.

Alex Anfinnes - 返信

2 of the small antenna stickers ripped while removing the back cover. Can those be replaced or will the phone function fine without them?

Jeremy Miller - 返信

Repairability Score 4?!? The Repairability Score for this one (and all other $amsung smartphones) should be 0!!

Naples - 返信

cuanto cuesta la tapa de atras

Estephania Donoso - 返信

what is the fkGDB 390486 ?

Bran - 返信

Dear Sir,

My phone shown “not registered on network “ plz confirm which board need to be replace.

Thanks and regards,

M. Hashir - 返信

Ich war auf der Suche nach einem Teardown Skin für mein Galaxy A51 in der silbernen Farbe und hab im Internet bei Google und bei lauter YouTube Videos durchgeschaut ob einer von denen eine gute Sicht von oben auf das A51 ohne Backcover und Mittelgehäuse hat… nun ja… ich bin zwar fündig geworden, aber die Seiten waren nicht parallel zu der Bildgrenze, also dort wo das Bild endet. Ich hab das in Photoshop bearbeitet, also pixel-perfect zugeschnitten, kanten parallel zur Bildgrenze geneigt und und und… Zudem war es noch etwas unscharf. Eines Tages, also heute, war ich weiter auf der Suche nach einem professionell angefertigtem Teardown Skin für das Galaxy A51 und habe dan hier die Rück- und Vorderseite als Teardown gefunden… ich hab mich echt gefreut aber auch irgendwie veraxsxht gefühlt, weil ich das nirgends in hoher und guter Auflösung gefunden habe… .Die Kanten sind zwar etwas zu weit rein geschnitten, aber trotzdem ist es supi. Nur… beim Teardown Bild ist es blau und leider nicht wenigstens schwarz.

Dan 209 - 返信

Freut mich, dass dann doch noch hier gelandet bist. Nächstes Mal kommst du einfach direkt hierher. ;)

Fabian Neidhardt -

My a51 died, he got stuck at samsung logo, tried recovery, clear cache and stuff. It just doesn’t start its not recognizable by pc i tried the odin and nothing. In fact I really don’t care about the phone is there a way to save the photos on the phone. SSD reader or a cable that connects me direct on the ssd of the phone.

Yll Kastrati - 返信

Keep hard resetting it, i mean a lot of times. It will eventually work, or get it in safe mode. If 190 times tring to hard reset it sdoes not work, rip it down to the battery, unplug it from the board, wait a few minutes and replug the battery in . …. Reassemble , and try to power on again once assembled.

Deanna Thackston -

I tried a screen replacement using this guide to teardown and when i go to reassemble the phone i checked it would charage and it would until i put the volume and power buttons back into place then it stopped charging, any idea why this may be a problem?

Josh Robinson - 返信

You have not replaced the small spacer sticker thys thingys that are like a little silver mesh piece, and tiny pad in it - it is grounding out on something that is stopping the electrical brain from completing the task it is supposed to be doing…. Be sure to use the gasket stickers, and even move them to the new bored drom the old one, also if there was thay flat black electrical tape on the ribbon cables, or on the frame , you will need to replace that too- use electrical tape if you dont have the ability to reuse the old spacers and pads and gaskets and tape…

Deanna Thackston -

Bonjour.

Apres avoir changer un connecteur de charge (toute la pièce avec la prise jack ...) j'ai des problèmes de réseaux sur mon a51.

Pensez vous que c'est du au fait que ce n'est pas une pièce officiel ou a un excès de colle lors du recollage de la vitre arrière ?

Merci de vos conseils et de pour ce que vous faites.

David Ceylon - 返信

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