Where would you actually find the HannStar J MV4 94V0 E89382 board? Based on repair logs from 2020–2025, this board appears in:
This is the UL File Number belonging to HannStar Board Corporation (not to be confused with HannStar Display). This file number verifies that the bare PCB (without components) was manufactured by a UL-certified facility. For a technician, this assures consistent trace thickness, copper weight, and solder mask quality. It also helps source exact raw replacement boards if the original is too damaged to repair.
The story begins with the board’s pedigree. HannStar (HannStar Display Corporation) is known for LCD panels, controllers, and power/logic hybrids. The J MV4 designation suggests a specific form factor—likely a monitor, laptop LCD timing controller (TCON), or a small power/logic combo board. hannstar j mv4 94v0 e89382 boardview top
The 94V-0 marking tells the fire safety story: the PCB substrate meets UL 94 V-0 rating, meaning it self-extinguishes within 10 seconds after flame exposure. This is standard for consumer electronics but essential here—this board probably sits near a backlight inverter or power supply.
E89382 is the UL file number for the PCB manufacturer or laminator. It confirms traceability: the bare board passed flame, tracking, and temperature tests. In a repair context, that file number verifies it’s not a cheap counterfeit blank. Where would you actually find the HannStar J
A very common issue with the MV-4 board is a failure in the 3.3V and 5V system power rails.
Based on typical HannStar display driver boards: For a technician, this assures consistent trace thickness,
| Area | Expected Components | Function | |------|--------------------|----------| | Edge Connectors | LVDS (30-pin), Backlight (6-pin), Power Input (12V/5V DC) | Panel interface & external power | | Power Regulation | APW7120 or RT8105 (PWM controller), MOSFETs (AO44xx), Inductors, Capacitors (16V/25V) | Generate VCC (3.3V), VDD (1.8V), AVDD (12V) | | Timing Controller (T-CON) | NT71667 or similar T-con IC | Generate gate/source driver signals | | MCU/Flash | 25-series SPI flash (Winbond 25X40) | Stores EDID & panel timing data | | Test Points | TP1, TP2 (GND), TP_VSYNC, TP_5V | Debug & signal measurement |