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  • Coolmax LCD Power Supply Tester PS-228
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Coolmax LCD Power Supply Tester PS-228

by Coolmax

List Price: $30.99
Price: $15.99 & FREE Shipping on orders over $35. Details
You Save: $15.00 (48%)
In Stock.
  • The easiest method to accurately test or diagnose faults with your PC Power Supply Unit
  • Introduces the new 8-pin PCI-Express connector
  • Accurate readings up to +/- 0.1 V
  • Compatible with 20-pin and 24-pin PSUs
  • Features Large, backlit LCD display
50 new 2 used from $8.99

Frequently Bought Together

Coolmax LCD Power Supply Tester PS-228 + Pc Motherboard USB & PCI Analyser Diagnostic Card Tester + eForCity® 20 / 24-pin Power Supply Tester for ATX / SATA / HDD, Black
Price for all three: $25.54

These items are shipped from and sold by different sellers.

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Technical Details

  • Brand Name: Coolmax
  • Model: PS-228

Product Details

  • Product Dimensions: 2.8 x 2.4 x 0.4 inches ; 4.8 ounces
  • Shipping Weight: 4.8 ounces (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B002R06PGE
  • Item model number: PS-228
  • Average Customer Review: 3.9 out of 5 stars  See all reviews (81 customer reviews)
  • Date first available at Amazon.com: December 19, 2005
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Product Description

Coolmax Technology, Inc PS-228 Device Tester 14912 885

Customer Questions & Answers

Customer Reviews

Longevity of the tester is still up for debate,only time will tell.
Scavanger
I got this to test customers power supplies on the road, and it works exactly as advertised.
John Wing
To turn on the power supply, Press and Hold the tester on/off button.
P. Skow

Most Helpful Customer Reviews

75 of 76 people found the following review helpful By P. Skow on March 5, 2011
Verified Purchase
Model PS-228 ATX Coolmaxusa Power Supply Tester
1. POOR Quality Control.
The Tester I received had a bad pin in the Floppy connector. Wiggling it caused the +5V light to go on/off.
It was NOT caused by a bad power supply cable plug. I took the tester apart, and re-soldered the jack's pins. (The person building it had clipped the lead wires so short that most of the solder was gone from 2 of the pins.) This tester is so cheap for what it's got in it that it wasn't worth the aggravation to send it back to Amazon and get a replacement.)

2. It comes with incredibly poor instructions. It meets my needs, once I discovered its limitations, and what pins/connectors did what to which displays.
But- for the price, it can't be beat.

The Model PS-228 ATX Power Supply Tester(PST) tests computers containing an "ATX" compliant style power supply.
It has a black aluminum case with plastic end caps, with a blue-lit LCD screen.
It has a stated voltage display accuracy of 0.1V.
It includes visual and audible alarms that tell you when the voltage level is too low(LL), too high(HH) or if there is no voltage from your power supply at all(LL).
There is no "mute" for the alarm, but normally, you only need the tester "on" for a short while.
The alarm is hi-pitch, so if your hearing is shot, you may have a hard time hearing it anyway.
It doesn't know if a cable/wire is actually connected or not. (so if you don't have a cpu connector plug attached, then it'll alarm anyway (so, for a missing "+12V2" connection on the left end, it will indicate a normal "LL").

This tester does NOT TEST -5VDC (white wire on the 20/24 pin connector). That voltage was used more on older computers; newer ones may not use it.
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33 of 37 people found the following review helpful By Robert Wurzburg on August 1, 2010
Hello folks, it seems like very few people understand how to properly use this PS
tester like me. Being an electronic and computer technician, I take things one step
at a time, and err on the side of safety.

Yes, the connectors are better marked on the PS-228 than the PS-224. Both of them
are in a plastic case, NOT aluminum, unless it is so thin and the plastic coating
so thick I can't tell by tapping it and the resulting sound. The PS-224 has been
discontinued, and is a better constructed unit. I ordered it and was shipped the
PS-228 instead, like someone else. IF it has the white connectors on the end in-
stead of black, KEEP IT! It has the better connectors and power button on it. I
should have kept this one and returned it in haste. The seller would not return
the exact one I returned back to me. It also said "PS-228" on the front if I am
remembering right.

Proper procedures are as follows:

With the power supply AC cord disconnected, plug in the 20 or 24 pin main connector.
Then plug in one of the Molex. Now you can plug in your power supply and get some
readings safely. If your power supply has a switch, turn that on. Both the PS-224
and PS-228 have a shorting connection internally replicating the power switch on a
PC. The PS-228 added this as a manual ON button. This tests 2 +12V rails. This will
beep if it does not see voltage from the second rail, and display "LL" on it. Look
at your display and understand what it is you are actually looking at!

Turn off your power supply, or unplug it. Unplug the Molex and plug in the FDD con-
nector. Restore power to your power supply and see your readings. Follow the same
procedure for the SATA connector.
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15 of 15 people found the following review helpful By Loren Malm on July 12, 2010
Summary:
This is a nice product, but the documentation could be better....

The Good:
The physical build quality on this unit is very good - it's built for a rough shop work and the aluminum case feels and looks like it will take the abuse of constant use for years to come. The display is very nice and easy to read backlit showing all the details you need; this is important for me since it seems like I'm always testing under a desk or somewhere dimly lit. Some other reviewers mentioned the 24 pin jack on the PS-224 was not well made and there was great difficulty in connecting the power supply - this must have been isolated to the PS-224, the PS-228 connects easily and correctly every time across several makes of power supplies I've tried. Testing an ATX power supply would be difficult without a unit like this.

The Bad:
If you decide to buy this unit, grab a known-working power supply and spend some time verifying this tester is working and you understand how it works before using it for troubleshooting. Unfortunately I did not have a known good power supply handy, and my first test with this unit was on a suspected bad power supply. In my initial test, I connected the 24 pin main power connection and the PS-228 beeped continuously and indicated a "LL" (zero voltage fault) with the +12V2. This seemed to indicate the power supply had a fault, so I obtained a new one and replaced it - but that didn't fix the problem, which through some more manual testing I discovered was with the video card.
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