Jedinica napajanja^{(Power Supply Unit)} je bitna komponenta svih poslužitelja za normalnu funkcionalnost IT infrastrukture. Danas gotovo svaki sustav dolazi s PSU tijekom kupnje. PSU ne isporučuje izravno napajanje vašem računalu, jer pretvara izmjeničnu struju (AC)^{(Alternating Current (AC) )} u istosmjernu (DC)^{(Direct Current (DC) )} koristeći svoje unutarnje komponente. Ako vaše računalo nema odgovarajući izvor napajanja ili PSUne uspije, mogli biste se suočiti s nekoliko posljedica, kao što je sustav može postati nestabilan ili se vaše računalo možda neće pokrenuti iz izbornika Start. U tom slučaju morate potražiti metode testiranja kako biste analizirali njegovo radno stanje. Ako to pokušavate, onda ste na pravom mjestu! Donosimo savršen vodič koji će vam pomoći da naučite kako testirati PSU multimetrom. Dakle, nastavite čitati kako biste saznali sve do detalja.

Kako testirati PSU multimetrom^{(How to Test PSU with Multimeter)}

Prije nego što naučite kako testirati PSU s multimetrom, evo nekih znakova s ​​kojima se susrećete kada napojna jedinica^{(Power Supply Unit)} pokvari.

• Računalo se uopće neće pokrenuti^{(PC won’t boot at all)} : Kada postoji problem s jedinicom napajanja^{(Power Supply Unit)} , vaše računalo se neće normalno pokrenuti. Kao rezultat toga, sustav se neće uspjeti pokrenuti i često se naziva mrtvim računalom^{(dead computer)} .
• Računalo se nasumično^{(PC restarts randomly or Shuts Down)} ponovno pokreće ili se isključuje : Ako se vaše računalo ponovno nasumično pokreće ili se gasi tijekom pokretanja, to ukazuje na kvar PSU .
• Plavi ekran smrti^{(Blue Screen of Death)} : Ako zaslon vašeg računala postane plav, postoji veća vjerojatnost da PSU nije u dobrom stanju.
• Zamrzavanje^(Freezing) : Kada se zaslon vašeg računala zamrzne bez razloga bez plavog ili crnog zaslona, ​​možda postoji hardverski problem.
• Zaostajanje i mucanje^{(Lag and Stuttering)} : Iznenadno zaostajanje i mucanje najčešći su problem, što možete potvrditi kroz metode testiranja.
• Greške na ekranu^{(Screen Glitches)} : Ovo je jedan od najčešćih razloga koji ukazuje na to da će jedinica za napajanje^{(Power Supply Unit)} uskoro biti mrtva .
• Buka iz ventilatora^{(Noise from the Fan)} : ako je vaše računalo u stanju mirovanja i čujete visoku buku, a ventilator radi na najvećem broju okretaja, provjerite je li sustav pregrijan. Ako nije, onda to znači da jedinica napajanja^{(Power Supply Unit)} ne radi. Osigurajte da se sustav ne pregrije bez ikakvog razloga.
• Pregrijavanje^{(Overheating)} : Pretjerano pregrijavanje također može biti znak lošeg rada jedinice za napajanje^{(Power Supply Unit)} .
• Dim ili miris gorenja^{(Smoke or burning smell)} : Ako je jedinica za napajanje^{(Power Supply Unit)} potpuno mrtva, mogla bi izbaciti dim zajedno s mirisom paljevine.

Koraci predostrožnosti^{(Precautionary Steps)}

Kada potvrdite da imate pogrešku s PSU -om i želite znati kako testirati PSU multimetrom, nastavite čitati ovaj odjeljak kako biste ga otklonili prije nego što slijedite metode testiranja.

Metoda 1: Uklonite USB uređaje i disk^{(Method 1: Remove USB Devices & Disc)}

Ako imate DVD-ove^(DVDs) , kompakt diskove^{(Compact Discs)} ili USB uređaje spojene na vaše računalo, odspojite^(disconnect) ih i ponovno pokrenite^{(reboot )} računalo. Savjetuje se da vanjske uređaje uklonite s velikom pažnjom kako biste izbjegli gubitak podataka.

1. Krećite se i locirajte ikonu Sigurno uklanjanje hardvera i izbacivanje medija^{(Safely Remove Hardware and Eject Media )} na programskoj traci.

2. Sada desnom tipkom miša kliknite ikonu^{(icon )} i odaberite^{(select )} vanjski uređaj koji želite ukloniti s računala.

3. Isto tako, sigurno uklonite sve ostale vanjske uređaje^{(external devices )} iz sustava i ponovno pokrenite^{(reboot )} računalo.

Metoda 2: Uklonite novi hardver^{(Method 2: Remove New Hardware)}

Možete pokušati odspojiti sve novi vanjski ili unutarnji hardver i periferne uređaje koje ste nedavno nabavili. Ako smatrate da vaše računalo radi dobro nakon uklanjanja hardverskih uređaja, onda novi hardver možda neće biti kompatibilan sa sustavom.

Također pročitajte: ^{(Also Read:)} Kako testirati napajanje^{(How to Test Power Supply)}

Metoda 3: Odspojite sve kabele^{(Method 3: Disconnect all Cables)}

Ako računalo nema dovoljno napajanja, mogli biste se suočiti s nekoliko teških sukoba koje morate riješiti. Čak i ako tijekom vašeg rada dođe do prekida napajanja, izvorna funkcionalnost sustava je poremećena. Također, ako koristite stari, oštećeni ili nepouzdan kabel, veza će se stalno prekidati s uređajem.

Čak i ako je brzina sustava vrlo visoka, nećete dobiti neprekidnu uslugu kada su žice pokvarene. Provjerite da žice nisu oštećene i ako nisu u optimalnom stanju, zamijenite ih novim prije nego što znate kako testirati PSU multimetrom.

1. Isključite kabele za napajanje iz utičnice i pokušajte spojiti sustav u zidnu utičnicu. Ovo će uspjeti u većini slučajeva.

2. Odspojite sve ostale kabele iz računala. Na primjer, možda imate a

• VGA kabel^{(VGA cable)} – kabel koji se koristi za povezivanje VGA porta monitora s vašim računalom,
• DVI kabel^{(DVI cable)} – kabel koji se koristi za spajanje DVI porta monitora na vaše računalo,
• HDMI kabel^{(HDMI cable)} – kabel koji se koristi za spajanje HDMI priključka monitora na vaše računalo,
• PS/2 cable – kabeli koji spajaju tipkovnice i miša na PS/2 portove sustava),
• Ethernet kabel^{(Ethernet cable )} – kabel koji povezuje mrežnu vezu sa sustavom,
• Ostali audio i USB kabeli^{(USB cables)} .

3. Molimo^(Please) pričekajte neko vrijeme, a zatim ih ponovno povežite^(connect) . Osigurajte da čujete tipičan zvučni signal dok ponovno pokrećete računalo.

Isto tako, konektori su bitne komponente kabela koje su potrebne za ispravno mrežno povezivanje. Uvijek trebate osigurati da su svi priključci u sustavu čvrsto povezani s kabelom i da su u dobrom stanju. Zamijenite ih ako su oštećeni. Zatim odspojite sve kablove.

Metoda 4: Odspojite sve kartice za proširenje^{(Method 4: Disconnect All Expansion Cards)}

Kartica za proširenje također je adapterska kartica ili dodatna kartica koja se koristi za dodavanje funkcija sustavu putem sabirnice za proširenje. Primjeri kartica za proširenje uključuju zvučne kartice, grafičke kartice, mrežne kartice itd. Sve te kartice za proširenje koriste se za poboljšanje funkcionalnosti njihovih specifičnih funkcija.

Na primjer, grafička se kartica koristi za poboljšanje video kvalitete vaših igara, filmova itd. Ponekad te kartice za proširenje mogu izazvati problem u sustavu. Stoga^(Hence) odspojite sve kartice za proširenje iz sustava. Ako ova metoda nije riješila problem, onda je bolje isprobati druge metode navedene u nastavku prije nego što znate kako testirati PSU multimetrom.

Također pročitajte: ^{(Also Read:)} Kako znati da li vaša grafička kartica umire^{(How to Tell If Your Graphics Card is Dying)}

Metoda 5: prozračite računalo^{(Method 5: Ventilate PC)}

Životni vijek vašeg računala će se smanjiti kada ga počnete koristiti na visokim temperaturama. Stalno pregrijavanje će istrošiti unutarnje komponente i sustav. Kada se sustav zagrije na maksimalnu temperaturu, ventilatori će se okretati na najvećem broju okretaja. Ipak, sustav se možda neće ohladiti na potrebnu razinu. U ovom slučaju, GPU će razviti opterećenje topline, što će dovesti do termičkog prigušivanja^{(Thermal Throttling)} . Ovdje će ventilatori i sustav postati nesposobni za smanjenje topline.

Stoga^(Hence) će kartice za proširenje smanjiti svoje performanse kako bi generirale manje topline. To će dovesti do najgorih performansi vašeg računala, au ekstremnim slučajevima, kartice za proširenje će poginuti ako se temperatura ne smanji. dakle^(Hence) ,

1. Uvijek pazite da sustav bude hladan^{(keep the system cool)} i održavajte odgovarajuću ventilaciju^{(maintain proper ventilation)} .

2. Ostavite sustav neaktivan neko vrijeme^{(Leave the system idle for some time)} kada je podvrgnut pregrijavanju ili nakon kontinuirane upotrebe.

3. Dodajte bolje sustave hlađenja^{(Add better cooling systems)} ako vaše računalo ima oštećene kablove za protok zraka i nakupinu prašine.

Metoda 6: Održavajte čist i prozračen ambijent^{(Method 6: Maintain Clean and Ventilated Ambience)}

Nečisto okruženje također može doprinijeti lošoj izvedbi sustava jer će nakupljanje prašine blokirati ventilaciju računala. To će povećati temperaturu sustava, a time bi se sve unutarnje komponente, uključujući jedinicu napajanja,^{(Power Supply Unit)} mogle oštetiti, uzrokujući ponekad pad sustava.

1. Očistite ventilacijske otvore^{(Clean the vents)} na monitoru i osigurajte da ima dovoljno prostora za pravilnu ventilaciju.

2. Izbjegavajte postavljanje računala na meku površinu^{(soft surface)} poput jastuka. Natjerat će sustav uroniti u površinu i blokirati ventilaciju zraka.

3. Za čišćenje ventilacijskih otvora u sustavu možete koristiti pročistač komprimiranog zraka . ^{(compressed air cleaner)}Pazite da ne oštetite unutarnje komponente u njemu.

Ako nijedna od gore navedenih metoda za rješavanje problema nije uspjela, nastavite čitati kako biste saznali kako testirati PSU multimetrom.

Metoda 7: Odspojite i povežite RAM i CPU^{(Method 7: Disconnect and Connect RAM and CPU)}

Ako nijedna od gore navedenih metoda ne uspije, pokušajte odspojiti CPU i RAM s matične ploče. Također provjerite je li RAM kompatibilan s vašim računalom.

1. Odspojite CPU i uklonite RAM s matične ploče.

2. Nakon nekoliko minuta spojite CPU i umetnite RAM natrag u matičnu ploču.

3. Provjerite rade li RAM , CPU i matična ploča dobro. Ako postoje povezani problemi, obratite se stručnom centru za popravke ili ih po potrebi zamijenite.

Pročitajte i: ^{(Also Read:)} Koliko RAM-a mi treba za Windows 10^{(How Much RAM Do I Need for Windows 10)}

Izvršite test PSU s multimetrom^{(Perform PSU Test with Multimeter)}

Ako ispravno izvršite korake za testiranje PSU - a s multimetrom, možete potvrditi postoji li problem s jedinicom napajanja^{(Power Supply Unit)} i zamijeniti je ako je potrebno.

Napomena:^{(Note: )} Dolje navedeni koraci prikazani su korištenjem standardnog ATX napajanja^{(standard ATX power supply)} .

1. Poduzmite sve gore navedene mjere opreza prije^(methods) nego ručno testirate PSU multimetrom.

Napomena:^{(Note: )} Nemojte preskočiti ovaj korak jer imate posla s visokonaponskom strujom.

2. Isključite^{(Shut down)} računalo i odspojite sve kabele. ^{(cables. )}Provjerite^(Make) jeste li isključili sve iz sustava.

3. Postavite računalo na nestatičnu ravnu površinu^{(non-static flat surface)} . Otvorite kućište računala i isključite prekidač na stražnjoj strani PSU -a .

4. Sada odspojite sve priključke za napajanje^{(power connectors)} koji su spojeni na unutarnje komponente.

5. Nakon što odspojite konektore, grupirajte ih zajedno s kabelima za napajanje kako biste učinkovito nastavili testiranje.

6. Uzmite žicu i spojite pinove 15 i 16 na 24-pinski konektor za napajanje matične ploče^{(24-pin motherboard power connector)} . Koristite tablicu za svoju referencu.

Pin	Name	Wire Color	Description
1	+3.3V	Orange	+3.3 VDC
2	+3.3V	Orange	+3.3 VDC
3	COM	Black	Ground
4	+5V	Red	+5 VDC
5	COM	Black	Ground
6	+5V	Red	+5 VDC
7	COM	Black	Ground
8	PWR_ON	Gray	Power Good
9	+5VSB	Purple	+5 VDC Standby
10	+12V1	Yellow	+12 VDC
11	+12V1	Yellow	+12 VDC
12	+3.3V	Orange	+3.3 VDC
13	+3.3V	Orange	+3.3 VDC
14	-12V	Blue	-12 VDC
15	COM	Black	Ground
16	PS_ON#	Green	Power Supply On
17	COM	Black	Ground
18	COM	Black	Ground
19	COM	Black	Ground
20	NC	White	-5 VDC (Optional – Removed in TX12V v2.01)
21	+5V	Red	+5 VDC
22	+5V	Red	+5 VDC
23	+5V	Red	+5 VDC
24	COM	Black	Ground

7. Možete postaviti napon napajanja prema svojoj zemlji na stražnjoj strani PSU čitanjem popisa napona i frekvencija (Hz) diljem svijeta^{(list of voltages and frequencies (Hz) around the world)} .

8. Sada uključite napajanje^{(Power supply )} u zidnu utičnicu.

9. Okrenite prekidač na stražnjoj strani PSU kako biste ga uključili. Sada provjerite počinje li se ventilator okretati, ako se vrti, a zatim nastavite sa sljedećim koracima. Ako se ventilator ne vrti, znači da je PSU neispravan i trebali biste ga zamijeniti.

Napomena:^{(Note: )} neke jedinice napajanja^{(Power Supply Units)} možda nemaju gumb na stražnjoj strani. Stoga^(Hence) se u ovom slučaju ventilator počinje vrtjeti čim uključite jedinicu u zid kako biste testirali PSU multimetrom.

Također pročitajte: ^{(Also Read:)} Kako koristiti Monitor performansi u sustavu Windows 10 (Detaljan VODIČ)^{(How to Use Performance Monitor on Windows 10 (Detailed GUIDE))}

10. Uzmite multimetar^{(multimeter )} i okrenite postavku na VDC (Volts DC) .

Napomena:^{(Note: )} Ako na multimetru nema značajke automatskog određivanja raspona, tada popravite raspon na 10,00^(10.00V) V.

11. Imate dvije sonde u multimetru. Crna sonda^{(Black probe )} je negativna sonda, a crvena^{(red probe )} pozitivna sonda. Spojite crnu sondu s bilo kojim crnim uzemljenjem. 

12. Sada uključite pozitivnu sondu sa svakim pinom koji nosi napon na 24-pinskom konektoru za napajanje matične ploče. ^{(24-pin motherboard power connector. )}Osiguravanje napajanja naponom na ovim pinama potvrdit će postoji li napajanje na svakom pinu.

Napomena:^{(Note: )} +3,3 VDC , +5 VDC , -5 VDC (opcionalno), +12 VDC i -12 VDC naponski vodovi su ugrađeni unutar pinova.

13. Zabilježite očitanja multimetra^{(multimeter readings)} i provjerite jesu li te vrijednosti ispod razine tolerancije, kao što je prikazano u tablici u nastavku.

Voltage Rail	Tolerance	Minimum Voltage	Maximum Voltage
+3.3VDC	± 5%	+3.135 VDC	+3.465 VDC
+5VDC	± 5%	+4.750 VDC	+5.250 VDC
+5VSB	± 5%	+4.750 VDC	+5.250 VDC
-5VDC (if used)	± 10%	-4.500 VDC	-5.500 VDC
+12VDC	± 5%	+11.400 VDC	+12.600 VDC
-12VDC	± 10%	-10.800 VDC	– 13.200 VDC

14A. Ako vrijednosti napona ne dolaze ispod dopuštenog raspona, to ukazuje na kvar PSU -a i morate ga zamijeniti.

14B. Ako su vrijednosti napona ispod prihvatljivog raspona, možete nastaviti s ispitivanjem s opterećenjem.

15. Okrenite prekidač na stražnjoj strani PSU -a da ga isključite i odspojite od zida.

16. Uklonite žicu^{( wire )} koju ste uključili u 4-pinski priključak za napajanje matične ploče^{(4-pin motherboard power connector)} .

17. Sada ponovno spojite sve unutarnje komponente.^{(internal components. )}

18. Zatim uključite jedinicu napajanja^{(Power Supply Unit )} okretanjem prekidača na stražnjoj strani i uključite računalo.

Napomena:^{(Note: )} Računalo možete UKLJUČITI bez kućišta. Potpuno je siguran za rad bez kućišta računala. Međutim, ako se vaše računalo ne uključuje bez kućišta, morate pomaknuti njegov odgovarajući kratkospojnik na matičnu ploču.

19. Ponovite korake od 11-13^{( Steps from 11-13)} s drugim priključcima za napajanje i osigurajte da zabilježene vrijednosti napona budu ispod dopuštenog raspona ( pogledajte^(Refer) tablicu u koraku 13^{( Step 13)} ). Ako zabilježena vrijednost padne predaleko od dopuštene granice, morate zamijeniti PSU .

20. Nakon što zamijenite neispravan PSU ili ako PSU nije imao problema, isključite računalo i pokrijte računalo njegovim kućištem.

21. Sada uključite svoje računalo i provjerite postoji li problem i dalje, ako da, pokušajte riješiti problem jer PSU sada ne uzrokuje problem.

Preporučeno:^{(Recommended:)}

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Nadamo se da je ovaj vodič bio od pomoći i da ste naučili kako testirati PSU s multimetrom^{(how to test PSU with multimeter)} i kako riješiti probleme povezane s PSU-om. Recite nam kako je ovaj članak pomogao. Također, ako imate bilo kakva pitanja/prijedlog u vezi s ovim člankom, slobodno ih ostavite u odjeljku za komentare.

How to Test PSU with Multimeter

The Powеr Sυpplу Unit is an еssential component of all servers for the normal funсtionalіty of the IT infrastructure. Today, almost every syѕtem comes with a PSU dυring purchase. The PSU does not deliver dіrect power to your computer, as it converts Alternating Current (AC) to Direct Current (DC) by using its internal components. If your computer does not obtain an adequate power supply or the PSU fails, you might face several consequences, like the system may become unstable or your computer might not boot from the start menu. In this case, you have to go for testing methods to analyze its working state. If you are trying to do so, then you are at the right place! We bring a perfect guide that will help you learn how to test PSU with multimeter. So, continue reading to know everything in detail.

How to Test PSU with Multimeter

Before getting to know how to test PSU with multimeter, here are some of the signs you face when the Power Supply Unit fails.

• PC won’t boot at all: When there is a problem with Power Supply Unit, your PC will not boot normally. As a result, the system will fail to start, and it is often termed a dead computer.
• PC restarts randomly or Shuts Down: If your PC restarts randomly or shuts down during the start-up, it indicates a PSU failure.
• Blue Screen of Death: If your PC screen turns blue, there are more chances that the PSU is not in good condition.
• Freezing: When your PC screen freezes for no reason without a blue or black screen, there might be a hardware problem over here.
• Lag and Stuttering: Sudden lag and stuttering is the most common problem, which you can confirm through the testing methods.
• Screen Glitches: This is one of the most common reasons that indicates soon to be dead Power Supply Unit.
• Noise from the Fan: If your PC is idle and you hear high noise, and the fan is running at the highest RPM, check if the system is overheated. If not, then it indicates the Power Supply Unit is failing. Ensure the system is not overheated without any reason.
• Overheating: Excessive overheating might also be a sign of the poor performance of the Power Supply Unit.
• Smoke or burning smell: If the Power Supply Unit is entirely dead, it might expel smoke along with a burning smell.

Precautionary Steps

When you can confirm you have an error with PSU and want to know how to test PSU with multimeter, then continue reading this section to troubleshoot it before following the testing methods.

Method 1: Remove USB Devices & Disc

If you have any DVDs, Compact Discs, or USB devices connected to your PC, then disconnect them and reboot your computer. You are advised to remove the external devices with intense care to avoid any data loss.

1. Navigate and locate the Safely Remove Hardware and Eject Media icon on the taskbar.

2. Now, right-click on the icon and select the external device you want to remove from your PC.

3. Likewise, remove all other external devices safely from the system and reboot your PC.

Method 2: Remove New Hardware

You can try disconnecting any new external or internal hardware and peripheral devices you got recently. If you find your computer working well after removing the hardware devices, then the new hardware may not be compatible with the system.

Also Read: How to Test Power Supply

Method 3: Disconnect all Cables

If the computer does not have enough power supply, you might face several difficult conflicts to resolve. Even if there are power interruptions during your work, the original functionality of the system is disturbed. Also, if you use an old, damaged, or unreliable cable, the connection will keep disconnecting from the device.

Even if the system speed is very high, you will not get uninterrupted service when the wires are broken. Ensure the wires are not damaged and if they are not in optimum condition, then replace them with a new one before knowing how to test PSU with multimeter.

1. Plug out the power cables from the power strip and try connecting the system to a wall outlet. This will work in most cases.

2. Disconnect all the other cables from the computer. For example, you may have a

• VGA cable – the cable that is used to connect the VGA port of the monitor to your computer,
• DVI cable – the cable that is used to connect the DVI port of the monitor to your computer,
• HDMI cable – the cable that is used to connect the HDMI port of the monitor to your computer,
• PS/2 cable – cables that connect keyboards and mouse on PS/2 ports of the system),
• Ethernet cable – cable that brings network connection to the system,
• Other audio and USB cables.

3. Please wait for some time and then connect them back. Ensure you hear a typical beep sound while restarting the PC.

Likewise, connectors are essential components of cables that are required for proper network connectivity. You should always ensure that all the connectors in the system are tightly held up with the cable and are in good condition. Replace them if they are damaged. Then, disconnect all the cables.

Method 4: Disconnect All Expansion Cards

An expansion card is also an adapter card or accessory card used to add functions to the system through the expansion bus. Examples of expansion cards include sound cards, graphics cards, network cards, etc. All these expansion cards are used to improve the functionalities of their specific functions.

For instance, a graphics card is used to enhance the video quality of your games, movies, etc. Sometimes, these expansion cards might trigger a problem in the system. Hence, disconnect all the expansion cards from the system. If this method didn’t fix the issue, then it is better to try other methods mentioned below before knowing how to test PSU with multimeter.

Also Read: How to Tell If Your Graphics Card is Dying

Method 5: Ventilate PC

The lifespan of your PC will be reduced when you start using it at high temperatures. Constant overheating will wear down the internal components and the system as well. When the system is heated to the maximum temperature, the fans will spin at the highest RPM. Yet, the system may not cool down to the required level. In this case, the GPU will develop a load of heat, leading to Thermal Throttling. Here, the fans and the system will become incapable of lowering the heat.

Hence, the expansion cards will reduce their performance to generate less heat. It will lead to the worst performance in your PC, and in extreme cases, the expansion cards will get killed if the temperature does not decrease. Hence,

1. Always ensure to keep the system cool and maintain proper ventilation.

2. Leave the system idle for some time when it is subjected to overheating or after continuous usage.

3. Add better cooling systems if your computer has damaged air flow cables and dust build-up.

Method 6: Maintain Clean and Ventilated Ambience

Unclean surroundings might also contribute to the poor performance of the system since the accumulation of dust will block the ventilation to the computer. It will increase the temperature of the system, and thereby all the internal components, including the Power Supply Unit might get damaged, causing the system to crash sometimes.

1. Clean the vents of the monitor and ensure there is enough space for proper ventilation.

2. Avoid placing your PC on a soft surface like pillows. It will make the system sink into the surface and block the air ventilation.

3. You can use a compressed air cleaner to clean the vents in the system. Be careful not to damage any internal components in it.

If none of the above troubleshooting methods worked, continue reading to learn how to test PSU with multimeter.

Method 7: Disconnect and Connect RAM and CPU

If none of the above methods work, try disconnecting the CPU and RAM from the motherboard. Also, check if the RAM is compatible with your PC.

1. Disconnect the CPU and remove RAM from the motherboard.

2. After a few minutes, connect the CPU and insert RAM back into the motherboard.

3. Check if the RAM, CPU, and motherboard are working well. If there are any associated issues, contact a professional repair center or replace them if necessary.

Also Read: How Much RAM Do I Need for Windows 10

Perform PSU Test with Multimeter

If you correctly execute the steps to test PSU with multimeter, you can confirm if there is a problem with the Power Supply Unit and replace it if needed.

Note: The below-mentioned steps are demonstrated using a standard ATX power supply.

1. Take all the above precautionary methods before you manually test PSU with multimeter.

Note: Don’t skip this step since you are dealing with high voltage electricity.

2. Shut down your PC, and unplug all the cables. Make sure you have disconnected everything from the system.

3. Place your computer on a non-static flat surface. Open the computer case and flip the switch off at the back of the PSU.

4. Now, disconnect all the power connectors that are connected to the internal components.

5. After you disconnect the connectors, group them along with the power cables to continue the test efficiently.

6. Take a wire and connect the pins 15 and 16 to the 24-pin motherboard power connector. Use the table for your reference.

Pin	Name	Wire Color	Description
1	+3.3V	Orange	+3.3 VDC
2	+3.3V	Orange	+3.3 VDC
3	COM	Black	Ground
4	+5V	Red	+5 VDC
5	COM	Black	Ground
6	+5V	Red	+5 VDC
7	COM	Black	Ground
8	PWR_ON	Gray	Power Good
9	+5VSB	Purple	+5 VDC Standby
10	+12V1	Yellow	+12 VDC
11	+12V1	Yellow	+12 VDC
12	+3.3V	Orange	+3.3 VDC
13	+3.3V	Orange	+3.3 VDC
14	-12V	Blue	-12 VDC
15	COM	Black	Ground
16	PS_ON#	Green	Power Supply On
17	COM	Black	Ground
18	COM	Black	Ground
19	COM	Black	Ground
20	NC	White	-5 VDC (Optional – Removed in TX12V v2.01)
21	+5V	Red	+5 VDC
22	+5V	Red	+5 VDC
23	+5V	Red	+5 VDC
24	COM	Black	Ground

7. You can set the power supply voltage according to your country at the back of the PSU by reading the list of voltages and frequencies (Hz) around the world.

8. Now, plug the Power supply into the wall socket.

9. Flip the switch at the back of the PSU to turn it on. Now, check if the fan starts to spin, if it does, then continue with the following steps. If the fan doesn’t spin, then the PSU is faulty, and you should replace it.

Note: Some Power Supply Units might not have a button at the back of them. Hence, in this case, the fan begins to spin as soon as you plug the unit into the wall to test PSU with multimeter.

Also Read: How to Use Performance Monitor on Windows 10 (Detailed GUIDE)

10. Take the multimeter and turn the setting to VDC (Volts DC).

Note: If there isn’t an auto-ranging feature on the multimeter, then fix the range to 10.00V.

11. You have two probes in the multimeter. The Black probe is the negative probe, and the red probe is the positive probe. Connect the black probe with any black ground pins. 

12. Now, plug in the positive probe with every pin that carries a voltage on the 24-pin motherboard power connector. Ensuring voltage supply across these pins will confirm if there is a power supply across each pin.

Note: +3.3 VDC, +5 VDC, -5 VDC (optional), +12 VDC, and -12 VDC voltage lines are inbuilt within the pins.

13. Note down the multimeter readings and make sure these values come under the tolerance level, as tabulated below.

Voltage Rail	Tolerance	Minimum Voltage	Maximum Voltage
+3.3VDC	± 5%	+3.135 VDC	+3.465 VDC
+5VDC	± 5%	+4.750 VDC	+5.250 VDC
+5VSB	± 5%	+4.750 VDC	+5.250 VDC
-5VDC (if used)	± 10%	-4.500 VDC	-5.500 VDC
+12VDC	± 5%	+11.400 VDC	+12.600 VDC
-12VDC	± 10%	-10.800 VDC	– 13.200 VDC

14A. If the voltage values do not come under the tolerable range, it indicates a PSU failure, and you have to replace it.

14B. If the voltage values come under the tolerable range, then you can continue testing with the load.

15. Flip the switch at the back of the PSU to turn it off and disconnect it from the wall.

16. Remove the wire you have plugged into the 4-pin motherboard power connector.

17. Now, reconnect all the internal components.

18. Next, turn on the Power Supply Unit by flipping the switch at the back of it and power on the PC.

Note: You can turn ON the PC without its case. It is entirely safe to operate without the computer case. However, if your PC does not turn on without its case, you have to move its appropriate jumper on the motherboard.

19. Repeat Steps from 11-13 with other power connectors and ensure that the voltage values recorded come under the tolerable range (Refer to the table in Step 13). If the recorded value falls too far away from the tolerable limit, you have to replace the PSU.

20. After you replace the faulty PSU or if the PSU had no problem, then turn off the PC and cover the computer with its case.

21. Now, turn on your PC and check if the problem still exists, if yes, then try troubleshooting the problem as the PSU is not causing the issue now.

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We hope that this guide was helpful and you have learned how to test PSU with multimeter and how to troubleshoot PSU-related problems. So let us know how this article helped. Also, if you have any queries/suggestions regarding this article, then feel free to drop them in the comments section.

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