iFixit

Pesky screws! As soon as you are all gone, the front-facing camera shall be freed.

Huzzah! Alas the front-facing camera gains its independence from the innards of the Epic 4G Touch.

The front-facing camera assembly is paired along with what seems to be the LED/ambient light sensor.

Gentle prying allowed the headphone jack and vibrator motor to be freed from the rear inner framework.

The vibrator motor is labeled 36CZB8QADHF.

The headphone jack/vibrator motor assembly is manufactured by Samsung, labeled as SPH-D710_EAR.

The front side of the motherboard contains the following major chips:

• Toshiba TC31501AAMBG WiMax package. According to Chipworks, "This device operates in the 2.5GHz frequency band and offers high-speed connectivity in the mobile environment with low power consumption." (Thanks guys!)
• Broadcom BCM4330XKFFBG 802.11 a/b/g/n MAC/Baseband/Radio with Integrated Bluetooth 4.0+HS and FM Transceiver/Receiver
• Maxim MAX8997 Power Management IC
• WIP4255H
• Avago CFI120 223713
• Maxim MAX8893C Power Management IC

We continue identifying the chips located on the rear-side of the motherboard:

• Samsung K3PE7E700B-XXC1 Dual-Core 1.2 GHz Processor
• Samsung Electronics Corporation (SEC) K521H12ACE
• Samsung KLMAG4FEJA-A003 16 GB Flash Memory
• Avago ACFM-7325 Band Class 14 PCS/Band Class 10 Cellular Band Quadplexer
• Qualcomm QSC6085 CDMA Processor
• Silicon Image 924480
• Yamaha YMU823 Audio Codec

We had to rely on some heat gun action to proceed further, as the glass panel and LCD are fused to the midplane.

Tons of heat and a set of guitar picks later, we separated the two components.

Newsflash: The display on this Samsung phone is manufactured by Samsung. How about that!

AMS452GN05 is the official designation on the ribbon cable, and it looks to be manufactured around January 11th of 2011.

We found the Atmel mXT224E mutual capacitance touchscreen controller, located on the rear side of the display assembly.

Samsung Epic 4G Touch Repairability Score: 7 out of 10 (10 is easiest to repair).

• Battery and microSD card can be accessed by simply removing the back cover.
• There's a total of 9 Phillips #00 screws to remove to gain access to the majority of the device.
• Most of the disassembly was straightforward and easy, and accomplished with standard tools.
• Some components share the same ribbon cable (front-facing camera and ambient light sensor, for example), thereby increasing repair costs.
• Speaker is soldered to the motherboard, making replacement more difficult.
• Glass panel and Super AMOLED Plus display are fused, making cracked screens a costly repair (and requires the use of a heat gun).