Component Analysis

Before reading this page, we strongly suggest looking at this article, which will help you better understand the insides of a PSU.



This platform is by Helly, and 1st Player is its retail brand. This is the same platform as in the Lian Li SP750, which I reviewed a while ago. The heatsinks are small on both the primary and secondary sides, and both VRMs and the fan-control circuit are installed on a daughter-board to save space. There are no cables to disrupt airflow, but the comparatively smaller fan than on the SP750 will have to keep RPM high to push enough air. Helly should also use a better fan than this Yate Loon specimen of low quality. Thankfully, all other parts are of good quality, but the fan's quality is still of immense importance.


The transient/EMI filter stages have all the necessary parts.


I found a TRX NB210108 SMD-Y-CAP on the business side of the main PCB.


The MOV should be covered in heat shrink to be kept in place if it blows up. There is no inrush current protection, which can lead to high start-up currents.


The bridge rectifier is bolted to a dedicated, small heatsink.


The APFC converter uses two Oriental Semiconductor FETs and a Global Power Technology boost diode. The bulk cap is by Chemi-Con and doesn't have enough capacity to provide a hold-up time of over 17 ms.


The APFC controller is a Champion CM6502UHH.


The two main switching FETs are installed in a half-bridge topology, and an LLC resonant converter is used for higher efficiency. The LLC resonant controller is a Champion CU6901T2X.


The unit's main transformer is partly surrounded by a metallic shield acting as a heatsink.


The FETs regulating the +12 V rail are installed on the solder side of the main PCB.


There aren't many electrolytic caps, but those Helly used are of high quality. Lots of polymer caps are also used for filtering purposes.


Two DC-DC converters generate the minor rails. They are installed on a daughterboard that also hosts the fan's header.



The 5VSB circuit uses an EM8569C PWM controller.


The supervisor IC is a Grenergy GR8313, which only provides the essential protection features.


Several polymer caps are installed on the face of the modular PCB.


Soldering quality is decent.


The cooling fan is by Yate Loon and uses a sleeve bearing. A better and larger fan should be used.