The Vestel 17IPS12 schematic deals with high-voltage mains electricity. The primary side of the board contains capacitors that can hold a lethal charge (over 300V DC) even after the TV is unplugged. Always discharge the main filter capacitors
Vestel 17IPS12 is a common power supply unit (PSU) and LED backlight driver used in various TV brands (e.g., Toshiba, Hitachi, Bush). Because these boards vary significantly by TV model, following a schematic requires understanding the specific production variant. 1. Critical Identification Warning
number refers to the raw PCB design, not the specific configuration Non-Interchangeability
: Two boards may look identical but have different output currents for LEDs Selection Rule : Always match the production number
(found on a white sticker on the back of the TV or the board) to ensure the voltage and current rails are correct for your screen size (e.g., 43-inch vs. 49-inch) 2. Common Component Failures
Based on repair data, these components are the most frequent points of failure: IC Q103 (Driver IC) : The most common cause of a "dead" board
. If the board is unresponsive, replacing this IC often restores functionality Shorted Diodes
: Often suspected first, but sometimes "ghost" shorts appear due to faulty parallel components or traces Oscillator/MOSFET vestel 17ips12 schematic
: If you experience "voltage pulsing" (voltage starts then cuts off), the issue is often the oscillator driving the MOSFET not maintaining a continuous signal 3. Troubleshooting Guide Likely Fault / Checkpoint Dead (No Power)
and the main fuse. Inspect for a missing or broken trace near the diodes Sound but No Picture Indicates a backlight failure. Check the boost converter
output; if it sits at 24V without boosting, the driver stage is failing Pulsing Voltage
Check the MOSFET and its driver. Ensure the 310V-400V rail is stable at the integrated circuit Wrong Backlight Brightness
Likely a mismatch in the current-set resistors (e.g., 4.7K/5.1K for 43" vs. 6.8K/2.2K for 49") 4. Schematic Resources
Detailed technical schematics for Vestel boards are often hosted on engineering and repair repositories:
: Frequently hosts PDF schematics for Vestel series, including variants which share similar architecture Technical Forums : Sites like ElektroTanya
are primary sources for specific component values not listed on the PCB.
: When repairing, avoid using high-heat hot air on the board material as it can lead to delamination; use a soldering iron with flux for discrete components component value list
for a specific 17IPS12 production number to check your resistors?
The Vestel 17IPS12 is an integrated power supply and backlight driver (inverter) board commonly found in 32-inch LED TVs from brands like SEG, Telefunken, and F&U . The schematic for this board, specifically the 17IPS12-R3
version, details a switched-mode power supply (SMPS) designed to convert mains AC into regulated DC voltages for the mainboard and the LED backlight. Core Circuit Sections Primary Power Conversion:
Converts mains power into several DC rails, typically providing stable outputs like LED Driver / Inverter:
A boost converter section responsible for stepping up the DC voltage to drive the TV's LED backlight strips. Control & Protection: the main converter activates.
Includes circuitry for overvoltage protection, brightness adjustment (PWM), and power on/off control. Key Components & Voltages Commonly uses the as the PWM controller for the switching stage. Output Diodes: STPS20H100CFP
Schottky diodes for high-frequency rectification on the 12V and 24V lines. Filtering:
Utilizes various capacitors (up to 470uF) and resistors to smooth output ripples and provide stable power to sensitive downstream electronics. Troubleshooting & Manuals
For in-depth repair, you can find full PDF diagrams on technical community sites: Service Manual & PDF: Vestel 17IPS12-R3 PSU Schematic is available for free download at Elektrotanya Detailed Overviews:
Comprehensive part layouts and interconnections are documented in Schematic Overviews on Scribd
When the TV is switched "ON" (via a PS-ON signal from the mainboard), the main converter activates.