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Wiki > Main > SamsungYH920 (r8)

Samsung YH-92x

Hardware

There are different versions of the YH-920 and YH-925 on the market. They come branded either as a "Samsung Yepp" or "Samsung Napster". On the back side, they are labelled either as "YH920GS/DXN" or "YH920GS1/ELS". This seems to be region specific. At least two different PCB revisions exist, one is labelled "YH-920 (REV 1.0) 2004.06.08", the other one "YH-920 (REV 2.1) 2004.09.01". The YH925 has a version specific to Canada without Radio (YH925GS). There are also different versions with different lables ("Yepp", "Napster", or just "DDigital Audio Player YH-925).

The hardware between YH925 and YH920 is mostly the same. The only difference is the display, and apparently the presence of a radio.

Parts List for both PCB revisions:

For PCB rev. 1.0, you will find an additional power distribution switch IC on the top side of the PCB: The FM Tuner chip is optional, is comes soldered as a small PCB together with a few additional resistors/capacitors on top of the main PCB:

Firmware

The original firmware, loaded from the first FAT32 partition of the hard drive, is in .mi4 format (see http://daniel.haxx.se/sansa/mi4.html for details). It is located in C:\SYSTEM\ . There are at least three original firmware versions named either "FW_YH920.mi4" or "PP5020.mi4", one dated 31.7.2004, another one dated 24.09.2004, and another one dated 28.1.2005.

A copy of the original flash bootloader is available on the hard disk as file C:\SYSTEM\PARMS\BL_YH920.rom . Not surprisingly, different versions of bootloaders exist. Firstly, they differ by version number, showing either "BootLoader ver.1.05" or "BootLoader ver.2.05" in the splash screen. Secondly, they differ by branding, one showing an animated Samsung logo, and another an animated Napster logo.

However, it is not fully clear yet which PCB revision / bootloader / firmware combinations are allowed. For example, a Napster branded device with PCB rev. 2.1 works perfectly with a Samsung branded bootloader ver 1.05 and firmware dated 28.01.2005. As can be seen from several user complaints in various forums, it seems that many of the faults seem to stem from incompatible combinations, although the hardware is 100% working. According to various forum threads, it also seems that the FM tuner chip - although physically available on the PCB - can be disabled by a firmware update.

PCB Images

Version: YH-920 (REV 1.0) 2004.06.08

[Back]
small_pcb_yh-920_back.jpg

[Front A]
small_pcb_yh-920_front_a.jpg

[Front B]
small_pcb_yh-920_front_b.jpg

Larger images: Back | Front A | Front B
I Attachment Action Size Date Who Comment
025-00671-0-AK4537.pdfpdf 025-00671-0-AK4537.pdf manage 484.6 K 05 Jun 2009 - 12:36 JensErdmann AK4537 Datasheet
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r8 - 12 Oct 2009 - 23:11:40 - DennisRoch
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