Question about Hi-Pro (HP-P401W) (HPP401W) Power Supply

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Computer will not turn on....how do I check to see if power supply is faulty? I have power supply removed and have a tester to check for dc voltage etc

Posted by Anonymous on

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I just went through a heap of troubleshooting with power supply issues before swapping psu's and finding this was the solution to my problem. Had a closer look at my psu that was faulty, the green light was flashing on the psu, unplugged all components and thought that I now had a non-flashing green light on my psu, on closer inspection the light was actually flashing very fast so appeared to be an almost solid light...the psu was stuffed so replaced it and no more issues. If your power supply has a green light check to see if it is flashing when plugged into voltage with nothing connected to it. If it is a solid light then it is probably ok.

Posted on Jul 11, 2010

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Posted on Jan 02, 2017

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Power off ac adopter is ok


remove the rear cover then tried to make a voltage checking since as you said the power adapter is good so what you need is a voltage checking going inside. you need a digital tester then make a voltage checking at the lcd control board if the dc supply goes through or not present. you can check also a bulged capacitor or burnt parts at the lcd control board.

Aug 09, 2012 | Dell UltraSharp 1701FP 17" LCD Monitor

Tip

How to test your AC/DC Adapter or Computer Power Supply Unit.


A PSU or Power Supply Unit aka AC/DC adpater is then means by which a low tension (voltage) appliance receives its power from the 240 AV mains supply, the this is usually accompanied by the nominal current that is drawn from the PSU on load in milliamps. (e.g. 500mAmps = 0.5 Amps) most modern DC adapters are unregulated, where the output voltage is only regulated by the load current, and a smoothing Capacitor is sometimes used to reduce AC ripple on the DC Level.
If the PSU is regulated the DC Voltage that you measure using an AVO even off load will be the same as the rated current.

Also most, not all, are double insulated (indicated by small square inside a larger one) this means that it doesn't need a earth on the plug, the give away is a plastic pin instead of a metal one found in most domestic plugs with a 13A fuse.

Using Ohms Law P= I x V means that we can find out either the Current in Amps Power in Watts or the Voltage of any unit this is also called the VA rating

The Simple test is if the adapter gets really hot as soon as the you apply AC power then this may indicate catastrophic failure OR a dead short and you must turn OFF immediately the plastic may even start to melt, you may also smell electrical burning. This will also happen if you ever use a non-specific adapter on your device that has a different output voltage this will almost certianly cause damage to your device.

The main test if to test the step-down transformer using an AVO (Amps Volts Ohms) this is what is used to reduce the 240V ~AC voltage to something more in line with the required DC supply say 14-16V ~AC, a diode bridge converts this to DC, if it is regualted there will be either and either a zener or resistor drops this to the rated 12V and a capacitor to smooth the level.
You need to make sure this is socket is working correctly by checking with either a lamp electricians screw driver or a AC test plug, dont use this socket you have an earth fault or someother problem, usually two lines at the outside of a AC socket tester means all is correct.
  1. First measure the resistance (Ohms) across the two AC pins that is the Live and Neutral this should have VERY low resistance in the range 300 to 2,000 (2K) Ohms. if this is the case then your primary winding is probably OK if you see 1 on all settings this means open circuit (O/C)
  2. Then connect the power supply to a 240V AC socket, and check the output voltage with multimeter set at volts DC you should see a stable voltage of the rated value for a regulated adapter or slightly higher by about 5% if its unregulated as this is a reading off load, if you were able to test the voltage with the adapter on load you would see the rated DC voltage.
  3. If you connect an unregulated AC/DC adapter to the device and open up the cover to test it under load and the voltage is low around 5V or less then the adapter will need replacing even if the off load value appears correct in above test ( ** ref the table below)
NOTE: If you have a AC only output then the test done in 1 can also be done, if there is a diode bridge, Zener Dicde OR Capacitor on the secondary this test wont work so you might have to remove the cover by unscrewing the tamper-proof screws and test it before the connection to the PCB, without the power on of course, check out my tip HERE for help on how to remove the screws.

If you have a faulty power supply its usually the thermal fuse that blows on the secondary winding, this means that you will get considerably less Voltage at the output jack of around 5 VDC or less and falling if this is the case the transformer is faulty and will need to be replaced with one of the same step-down ratio. OR you will need a new AC/DC Adapter, check out this table for examples of the results that you might find.

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** The Amstrad Black PSU that reports 24V and 383 Ohms on the primary may still not deliver the rated voltage under load and therefore I have marked this as a false positive and therefore FAULTY.

NOTE: The AC/DC Chargers are constant current devices (the symbol is usually two interlocking circles and even though you can do similar tests on the transformer primary coil its the current that it delivers under load that is important the only way to test this is using a clamp meter on the cable to see the current under load this should match the rated current.

COMPUTER ATX PSU

Most ATX power supplies are known as switched mode can only be tested under load when connected to the PC motherboard this is a bit tricky using a plain old Fluke, AVO or Multimeter the best way is to buy dedicated PSU tester for the type of Power Unit you have, it will check the DC voltages in the range + 12V,-12V,+5V,+5VBs and +3.3V on both the SATA and IDE supply cables these cost about £20 ($35) you can test the unit in as little as 5 mins.

on May 11, 2010 | Computers & Internet

1 Answer

Seiki


hi,the first thing to check with this kind of problem is the power supply section.this requires opening of the back cover.If you are handy with electronics you can check the voltage present at the power board by using a digital multimeter..

here's the procedure,
Use a philip screw driver to unscrew the cover.once the cover is remove,you can immediately see the power supply board .Powe supply board is where the power cord is connected(make sure to unplug the unit before proceeding)
check the fuses,set the tester to resistance or continuity test.test the fuse you must have a reading of 0000 this means that fuse is good OC means fuse is open.replace the fuse with the same type of amperage it is printed on the fuse...
If the fuse are ok,check for the voltage output of the power board.voltage are as follows,
5 volts DC supply for the mainboard
12volts DC for the audio board
24 volts DC for the screen
when all this voltages are present problem could be on tha mainboard itself and needs a replacement.

If one of the voltages fails then you need to repair the power board check and replace all bulging capacitors and open resistors.you can also replace the whole powerboard It is available online at shoppejimmy.com
good luck and let me know how it goes..

Jun 06, 2012 | Seiki SC221FS 22 Class LCD HDTV

1 Answer

Yamaha no power


you need to check the power supply input of your amplifier using a multimeter set your tester into a dc voltage reading.then measure the power input you must have a DC voltage supply reading..open the cover check the fuse an open fuse will turn the unit to no power.there are causes of blown fuse a shorted power transistor at the circuit will blown the fuse you need to replace faulty transistors before putting up a new fuse...check also the diode at the power supply section ,faulty diode could lead to the same problem..

Sep 30, 2011 | Yamaha P-2500 Amplifier

1 Answer

Will not turn on, makes click click sound


you have a shorted transistor on your power supply section find it by using tester or on the secondary of fly-back...or try to hang the connection of b-plus to your fly-back then power on then you have to voltage data range your tester to dc and check supply of b-plus if there's supply of 100volts dc your fly-back is defective replace it

thank you very much and don't forget to vote and rate my answer

Mar 06, 2011 | Samsung Televison & Video

1 Answer

There is a buzzing noise screen is black red power light blinks five times then stops


you have a shorted transistor on your power supply section find it by using tester or on the secondary of fly-back...or try to hang the connection of b-plus to your fly-back then power on then you have to voltage data range your tester to dc and check supply of b-plus if there's supply of 100volts dc your fly-is defective replace it thank you

Mar 05, 2011 | ESA Televison & Video

1 Answer

I have a 1999 RCA TV model # P52921. It completely shut down. It has no sound and picture. I checked the fuse with my tester and there is power coming out of the fuse. I hear a slight, faint, pulsating...


Check SMPS power supply. DC voltages. First check the power supply
bridge/ diodes. Then check DC votage should be 70% rating of the
capacitor voltage. If the capacitor is dry it will show low voltage.

But the diodes should be OK. Check the high wattage resistors
connected in the power supply. There will be a resistor in the
ac input also. Beyond this check all +DC voltages.

Aug 23, 2010 | Televison & Video

1 Answer

My aspire will not turn on I mash power button and it lights for a few seconds and goes off what could be the problem?


this seem like the battery is not charge.(dead). The power supply is probably not working therefore it is not charging the battery. Check it the power supply has a light.. see if it on. you may need a voltage tester to test the power supply of it dc voltage of 19V Dc,

Jan 21, 2010 | Acer Aspire One PC Notebook

1 Answer

Lucent cs926a does not power up, AC light lite


Power supplies are made using high frequency switching technique. Most supplies will not show any voltage without a load. You can get a good load tester for less than $20.00. Of course I've seen this power supply on Ebay for $15.00.

Mar 28, 2009 | Computers & Internet

1 Answer

Power Supplies Question


Usually, It can measure AC and DC voltage, DC current, and resistance. It also checks diodes, verifies continuity, and tests 1.5 V and 9 V batteries

Aug 27, 2008 | GB Electrical GET-202A Low Voltage Tester

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