| Page Range | Section | Critical Components/Nodes | |------------|--------------------------|--------------------------------| | 1-2 | Index & Revision History | Rev 1.0, Date 2016/10/21 | | 3-5 | Power Tree & Sequence | +3VALW, +5VALW, +1.0V_VCCIO, +1.35V_VDDQ | | 6-12 | CPU Core (VCC_CORE) | Multi-phase controller (e.g., MP2949), NCP81218 | | 13-18 | PCH (Platform Controller Hub) | RTC circuit, SLP_S3/S4#, Deep Sleep | | 19-25 | DDR4 Memory | VDDQ 1.2V, VPP 2.5V, SPD 3.3V | | 26-35 | NVIDIA GPU Core (NVVDD) | MP2888/MP2886, FBVDDQ (1.35V), PEX_VDD | | 36-40 | Thunderbolt / USB-C | TPS65982, CC lines, PD contract | | 41-45 | Audio Codec | ALC3266 (equivalent to ALC298), AMP NAU8224 | | 46-50 | LAN & Wireless | RTL8168/8111, WLAN M.2 slot (CN1) | | 51-55 | Keyboard Controller | IT8226VG, KBC_PWR_ON, AC_PRESENT | | 56-60 | DC/DC Charging | BQ24780S, ACDRV, ACP, BATDRV | | 61-65 | LCD Backlight & eDP | +LCD_VDD, eDP_HPD, Backlight PWM (BRIGHTNESS) | | 66-70 | Fan Controllers | Two fans: CPU_FAN, GPU_FAN (PWM tachometer) |
If the TV turns on and yields sound but shows a blank screen, the LED driver is often at fault. The 17IPS72 schematic includes an LED step-up converter. Test the output voltage at the backlight connector. 17ips72 schematic
Visually inspect capacitors for bulging tops; check ESR values. Replace dried-out secondary capacitors with low-ESR, 105∘C105 raised to the composed with power C -rated components. Tips for Reading the Schematic and Repairing Safely | Page Range | Section | Critical Components/Nodes
This section remains active even when the TV is off. It provides the low-voltage standby rail to the mainboard. Visually inspect capacitors for bulging tops; check ESR
depending on whether the specific sub-variant utilizes active Power Factor Correction (PFC). 3. PWM Controller and Primary Switching
– A smaller archive that has schematics such as Hitachi_55HB6T72U_55289DLB_17MB110‑R2_17IPS72.pdf .