The Vestel 17IPS72 is a widely used power supply board found in LED TVs from brands like JVC, Hitachi, and Toshiba. This schematic guide covers the primary functional blocks, common failure points, and key components based on the 17IPS72 R4 and 17IPS72R3 revisions. 1. Power Factor Correction (PFC) Stage
The PFC stage regulates the power input from the mains supply to provide a stable high-voltage DC bus.
Controller IC: Typically utilizes a PFC controller like the FAN7529. Key Components: PFC MOSFET: Switched by the controller to boost voltage. Heatsink R34: Dissipates heat from the PFC MOSFET.
Output Voltage: Boosts the rectified AC to approximately 400V DC for downstream circuits. 2. Main Power Supply & Standby
This section generates the low-voltage rails required for the TV’s mainboard and backlight.
Standby Rail (+12V_STBY): Controlled by Q10 and U5 to provide power even when the TV is off. Main Voltage Rails: +12V / +12V_1: Powers the mainboard and audio circuits. +75V_1: Often used for the LED backlight driver stage.
Audio Regulation: Uses components like Q12 and R91 for stable audio power. 3. LED Driver Stage
Integrated on the same board, this circuit drives the LED strips in the display panel.
PWM Dimming: Controlled via the PWM_DIM signal on pins 7 and 8 of the interface connector.
Backlight Control: Uses BL_ON-OFF signals (linked to +12V_STBY via a 10k resistor) to trigger the LEDs. 4. Common Troubleshooting Points
When repairing an 17IPS72 board, check these specific areas identified in community repair guides:
No Standby Power: Inspect U5 and associated resistors like R8 (1n) and D46.
PFC Failure: Check the PFC MOSFET for shorts and the FAN7529 controller for VCC.
Blown Diodes: Diodes like the UF5402 and STPS20H100CFP (for 12V/24V) are common failure points due to high thermal stress. 17ips72 schematic
Capacitor Health: Look for bulging in electrolytic capacitors such as C110, C112, and C115. Summary Table: Key Schematic Markers Key Components Input PFC MOSFET, FAN7529 400V DC Regulation Output 1 Q10, U5, D46 +12V Standby Output 2 STPS20H100CFP +12V / +24V Main Power Backlight BL_ON-OFF, PWM_DIM LED Driver Control
For full circuit values, you can download the Vestel 17IPS72 Service Manual from Elektrotanya or view the 17IPS72-R4 PDF on Scribd. 17ips72 R4 PDF - Scribd
The schematic for the Vestel 17IPS72 power supply unit (PSU) can be found through several dedicated electronics repair and manual hosting sites. This board is commonly used in various LED TV brands such as JVC, Hitachi, and Toshiba. Available Schematic Downloads
Elektrotanya: You can download the full service manual and circuit diagram for the Vestel 17IPS72R3
, which includes detailed component layouts and repair info. Scribd: Multiple revisions are hosted here, including: Vestel 17IPS72R3 Schematic. Vestel 17IPS72-R4 Diagram. 17IPS72P (Philips variant). Technical Overview The 17IPS72 circuit typically features:
Power Factor Correction (PFC): Uses a PFC controller and MOSFET to regulate input power and provide a stable DC output (often around 400V for downstream components).
Standby Rail: Provides a critical 5V-STBY rail; a lack of this is a common failure point often discussed on repair forums like Elektroda.
Common Issues: Typical failures include burnt fuses, resistors, or capacitors that cause low voltage flickering or a total "no standby" condition.
Are you troubleshooting a specific fault like a "no standby light" or "flickering screen" issue?
The Vestel 17IPS72 is a widely used power supply and LED driver board found in various budget-friendly LED TVs, including brands like JVC, Hitachi, Toshiba, and Bush. Technical Overview & Design
The 17IPS72 schematic reveals a standard Switch Mode Power Supply (SMPS) design with integrated LED backlighting control.
PFC Stage: Includes a Power Factor Correction (PFC) controller and MOSFET (often cooled by a dedicated heatsink) to regulate the 400V DC rail for main power stages.
Voltage Rails: Typically provides common output voltages like and The Vestel 17IPS72 is a widely used power
for the mainboard, alongside high-voltage outputs for the LED backlight strings.
Control Signals: Features dedicated pins on the CN2 connector for functions such as Standby (STB), Backlight On/Off (BL_ON-OFF), and PWM Dimming. Common Faults & Repairability
The schematic is essential for troubleshooting this board, as it is prone to several well-documented failures:
No Power / Blown Fuse: Often caused by shorted primary-side components like the PFC MOSFET or the main bridge rectifier.
Stuck in Standby (No 5V/12V): Frequently linked to failures in the standby controller IC or startup resistors.
Backlight Failure (Sound but no Picture): A common issue where the LED boost MOSFET or boost diodes (e.g., UF5402 or UF5404 types) fail.
Voltage Fluctuations: Low or pulsing output voltages can often be traced back to faulty capacitors or an unstable oscillator driving the main MOSFET.
Vestel 17IPS72 is a widely used power supply unit (PSU) found in various LED TV brands, including
. If your TV has no power, no standby light, or a blinking LED, there is a high chance the issue lies within this board.
Here is a blog-style guide to understanding and troubleshooting the 17IPS72 with the help of its schematic. Understanding the 17IPS72 Power Supply Board
The 17IPS72 is a combined power supply and LED driver board. Its primary job is to take the AC mains voltage and convert it into low-voltage DC (typically
) for the mainboard and high-voltage DC to drive the LED backlight. Key Sections of the Schematic: EMI Filter & Rectifier:
The entry point where AC is filtered and converted to raw DC. PFC (Power Factor Correction): Often uses a controller like the to boost voltage to around for efficiency. Standby/Main Switcher: Usually controlled by an IC (e.g., or similar) to generate the stable 12V rail. LED Driver: Badcaps
Steps up the voltage to power the screen’s backlight strips. Common Failures & Troubleshooting If you are looking at a 17IPS72 Service Manual or Schematic , keep an eye out for these frequent culprits: 1. No Power / Dead Board Check the Fuse (F100):
If blown, don't just replace it. Check the bridge rectifier and the main MOSFET for shorts. Start-up Resistors:
High-value resistors in the PWM controller circuit often go "open circuit," preventing the board from "waking up." 2. TV Blinks but Won't Start Schottky Diodes: Check the secondary output diodes (e.g.,
). These are famous for shorting out on Vestel boards, causing the power supply to enter "protection mode." Capacitor Health:
Look for bulging electrolytic capacitors. Even if they look fine, they can lose capacitance and cause ripple voltage that confuses the mainboard. 3. Sound but No Picture (Backlight Failure) LED Driver Circuit:
Check the voltage at the backlight connector. If it spikes and then drops, one of your LED strips inside the panel is likely burnt out. If there is no voltage at all, check the driver MOSFET and the boost diode on the board. Safety First! Power supplies contain large capacitors that can hold a lethal charge (400V+)
even after the TV is unplugged. Always discharge the main filter capacitor before touching the board or using a multimeter in resistance mode. Where to find the Schematic?
For detailed component values and circuit paths, you can download technical documents from community-driven databases like Elektrotanya or discuss specific component IDs on repair forums like
Are you currently testing a board, and if so, what voltages are you getting at the output connector?
Legitimate sources (avoid malware-ridden free download sites):
⚠️ Warning: Many "free" schematic sites bundle .exe downloaders or password-protected RAR files. Always scan with VirusTotal before opening.
The EC is usually an IT8227VG or MEC1653. The schematic’s EC section reveals:
If your Legion 5 powers on but shows a black screen with fan spinning, check the EC’s LPC bus and SPI flash connection (page 22–25).
Pages 8–12 usually cover the USB-C controller (e.g., TPS65994 or RT1715). The 17ips72 often uses ROHM’s BD99956 or TI’s TPS65987D for dual USB-C ports. If your laptop doesn’t charge via USB-C but charges via the barrel jack, suspect a failed PD controller or bad CC line resistors.
| Component | Designator | Failure Mode | Fix / Test Point | |-----------|------------|----------------|-------------------| | Charging IC | PU1 (BQ24780S) | No battery charge, AC not detected | Check ACDRV (5.5V-6V), ACP (25V-27V) | | CPU VR controller | PU601 (MP2949) | No CPU core voltage | Check VIN, EN (3.3V), VR_READY | | GPU VR controller | PU801 (MP2888) | No display, GPU hot but no Vcore | Check I2C, PWM outputs to power stages | | USB-C controller | PU301 (TPS65982) | No PD contract, no USB-C display | Reflash SPI ROM (U302) | | EC/KBC | IT8226VG | No power-on, fans max speed | Check +3V_EC, LID_SW#, EC_RST# | | CMOS Battery | BT1 (CR2032) | Resets every boot, slow POST | Replace battery, check RTC jumper |