BOARD: Amazon Fire TV Stick Gen 2 · Model LY73PR · MB-18M
PCB Forensic Analysis — Annotated Board
J1 HDMI
HDMI Type A — 19-pin video/audio output to TV. TMDS ×3 + CEC + DDC + HPD + 5V
BCM43569
BCM43569 WiFi/BT under "TA" shield — 802.11ac 2×2 MIMO dual-band + BT 4.1. Antenna traces run to board edge.
ESD?
Black rectangular component between TA shield and HDMI — likely HDMI ESD protection array (TVS diodes on TMDS lines). Possibly the component referred to as "IHD".
MT8127D
MediaTek MT8127D SoC under main EMI shield — quad-core ARM Cortex-A7 1.3GHz, Mali-450 GPU, HDMI 1.4 TX, USB OTG. Memory stack (LPDDR3 + NAND) also under this shield.
1GB LPDDR3
Samsung 1GB LPDDR3 — stacked on or adjacent to MT8127D under main shield
8GB NAND
Toshiba 8GB NAND eMMC — under main shield. Contains FireOS + userdata partition.
UART TX/RX
Two test pads — likely UART0 TX/RX debug console (115200 baud, 3.3V). MediaTek preloader + kernel dmesg accessible here. Unpopulated in production.
PMIC
Power Management IC under bottom shield — generates VCORE, VMEM, VIO, VDDRF from 5V USB input. Likely MT6323 class.
J2 Micro-USB
Micro-USB power input — 5V @ 1A DC. Data pins not wired (power only). J450 reference designator nearby.
Serial
Board serial label: P4N14M010155630W — manufacturing batch/unit identifier
Image note: Full-resolution image (4500×8000, ~2MB) embedded in HTML.
Marker positions are approximate from visual analysis. "TA" label confirmed on upper shield.
All shield contents are INFERRED from FCC filing + TechInsights teardown data for LY73PR.
Component Reference Table
Ref Type Part / ID Function Confidence
J1 HDMI Type A Standard 19-pin Video + audio output CONFIRMED J2 / J450 Micro-USB-B Standard 5-pin 5V DC power input (data N/C) CONFIRMED U_SoC ARM SoC (BGA) MediaTek MT8127D Quad-core CPU, GPU, HDMI TX INFERRED U_WiFi WiFi+BT combo BCM43569 (under TA shield) 802.11ac 2×2 + BT 4.1 INFERRED U_RAM LPDDR3 (BGA) Samsung 1GB System RAM INFERRED U_NAND eMMC NAND Toshiba 8GB OS + user storage INFERRED U_PMIC PMIC MT6323 class (est.) Multi-rail power regulation ESTIMATED U952 Small IC Unknown Power or signal conditioning UNKNOWN ESD (near J1) TVS array PRTR5V0U2X or equiv HDMI ESD clamp — IHD area ESTIMATED L700 SMD inductor ~1–4.7µH DC-DC output filter CONFIRMED (ref) TP1/TP2 Test pads UART0 TX/RX Debug console access ESTIMATED ANT×3 PCB trace Built-in 2×2.4GHz + 1×5GHz INFERRED
