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Wiki > Main > SamsungYH920

---+!! Samsung YH-92x

%TOC%

---++ 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:

   * CPU: PortalPlayer !PP5020D-TF
   * RAM: Samsung !K4S561632E-TC75 (32MB SDRAM), see http://www.datasheetcatalog.net/de/datasheets_pdf/K/4/S/5/K4S561632E-TC75.shtml
   * Flash Memory 4Mbit: Macronix MX 29LV400 TXEC-70, see http://www.macronix.com/QuickPlace/hq/PageLibrary48256F55002C90A5.nsf/h_Toc/75d338438656550a48256f5500408bf7/?OpenDocument
   * LCD: 160 x 128 (YH920: Greyscale; YH925: Color), Models unknown
   * LCD controller: same controllor as Iriver H10 20GB/Iaudio x5 and other target (Renesas HD66773,[[http://www.rockbox.org/twiki/pub/Main/IaudioX5HardwareComponents/eHD66773R_1.2.pdf][datasheet]])
   * Audio: AKM !AK4537VN, see [[%ATTACHURL%/025-00671-0-AK4537.pdf][datasheet]]
   * Power Manager and Battery Charger: Linear LTC3455, see http://www.linear.com/pc/productDetail.do?navId=H0,C1,C1003,C1037,C1078,C1583,P2447
   * Hard Disk: 20 GB 1.8 inch, Toshiba !MK2004GAL
   * Connector for USB and chargers: as specified in [[http://www.tta.or.kr/English/index.jsp][TTA]] standard TTAS.KO-06.0028/R2, see http://www.tta.or.kr/include/Download.jsp?filename=stnfile/TTA-0044.pdf
For PCB rev. 1.0, you will find an additional power distribution switch IC on the top side of the PCB: 
   * Texas Instruments TPS2020, see http://focus.ti.com/docs/prod/folders/print/tps2020.html
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: 
   * FM Tuner: Philips TEA5767, see http://www.nxp.com/pip/TEA5767HN_V2.html
---++ 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]<br /> <img alt="small_pcb_yh-920_back.jpg" src="%ATTACHURLPATH%/small_pcb_yh-920_back.jpg" />

[Front A]<br /> <img alt="small_pcb_yh-920_front_a.jpg" src="%ATTACHURLPATH%/small_pcb_yh-920_front_a.jpg" />

[Front B]<br /> <img alt="small_pcb_yh-920_front_b.jpg" src="%ATTACHURLPATH%/small_pcb_yh-920_front_b.jpg" />

Version: YH-925 (REV 1.6) 2004.12.09 by Nichlas

[Back]

<img width="2048" alt="IMG_2151.JPG" src="http://www.rockbox.org/wiki/pub/Main/SamsungYH920/IMG_2151.JPG" title="IMG_2151.JPG" height="1536" />

[Front]

<img width="2048" alt="IMG_2138.JPG" src="http://www.rockbox.org/wiki/pub/Main/SamsungYH920/IMG_2138.JPG" title="IMG_2138.JPG" height="1536" />

[Behind Display]

<img alt="IMG_2181.JPG" src="http://www.rockbox.org/wiki/pub/Main/SamsungYH920/IMG_2181.JPG" title="IMG_2181.JPG" />

Larger images: [[%ATTACHURLPATH%/pcb_yh-920_back.jpg][Back]] | [[%ATTACHURLPATH%/pcb_yh-920_front_a.jpg][Front A]] | [[%ATTACHURLPATH%/pcb_yh-920_front_b.jpg][Front B]]

I	Attachment	Action	Size	Date	Who	Comment
pdf	025-00671-0-AK4537.pdf	manage	484.6 K	05 Jun 2009 - 12:36	JensErdmann	AK4537 Datasheet
JPG	IMG_2138.JPG	manage	1162.6 K	20 Oct 2009 - 19:22	JensErdmann	Front
JPG	IMG_2151.JPG	manage	1380.0 K	20 Oct 2009 - 19:24	JensErdmann	Back
JPG	IMG_2181.JPG	manage	1329.3 K	20 Oct 2009 - 19:27	JensErdmann	Behind Display

r9 - 20 Oct 2009 - 19:31:25 - JensErdmann