Vestel 17ips12 Schematic – Pro & Popular

You can measure critical test points: PFC output (should be ~380V DC), 5VSB, and VCC for the PWM ICs. The schematic lists expected voltages.

The Vestel 17IPS12 is a combination power supply (PSU) and LED backlight driver board commonly used in LCD/LED televisions from brands like Hitachi, Toshiba, JVC, and Finlux. Schematic and Download Links

You can find and download the official circuit diagrams and service manuals for the 17IPS12 from these technical archives:

Elektrotanya (Direct PDF): Provides a free download of the R3 revision schematic. Scribd -

Overview: A detailed technical layout identifying specific parts and configurations.

Scribd - Power Supply Section: Focuses on the conversion of mains power to regulated +5V and +12V DC. Core Circuit Sections vestel 17ips12 schematic

The board is generally divided into two main functional areas:

Mains Power Supply: Converts AC mains voltage into stable low-voltage DC (typically +12V, +24V, and +5V) to power the TV's main board and microcontroller. Key components include a step-down transformer, rectifier diodes (like the STPS20H100CFP), and various filtering capacitors.

Backlight Driver (Inverter Section): Uses a boost converter to increase DC voltage to the levels required to drive the LED backlight. It features an H-bridge circuit with MOSFETs and a feedback loop to regulate lamp current. Common Troubleshooting Tips

If you are using the schematic for repairs, technicians often report the following issues with this board:

No Backlight (Sound but No Picture): Often caused by a failure in the boost converter section. If you see roughly 24V at the output instead of the higher boosted voltage, the choke or driver IC may be faulty. You can measure critical test points: PFC output

Dead Set (No Power): Check the primary side fuses and bridge rectifiers. Capacitors in the 17IPS12 series are also known to fail or "bulge" over time, leading to unstable output voltages.

Diode Failures: Schottky diodes in the secondary rectification stage (like the 12V and 24V lines) are common points of failure.

Warning: This board handles high-voltage mains power. Only attempt repairs if you have the proper tools and experience to avoid fatal electrical shock.

Vestel 17IPS12 no backlights , fault finding to component level

| Symptom | Suspect Component (per schematic) | |--------|------------------------------------| | No 5V standby | VIPer22A (IC802), startup resistor R811 (1MΩ), C822 (Vcc cap) | | 5V present, no 12V/24V | Main PWM LD7535 (IC801) not starting. Check Vcc from auxiliary winding via D809. | | 24V low or fluctuating | Optocoupler PC801 or TL431 (IC851) feedback loop; failing capacitor C861 on compensation pin. | | Blown main fuse | Shorted bridge DB801, main MOSFET Q801 (G-S short), or MOV801 (varistor). | | Audible squeal | Bad capacitor in primary: C821, C822 (Vcc filtering). | | Symptom | Suspect Component (per schematic) |

With the schematic, you can measure reference voltages: 5V_SB at TP801, 12V at TP803, 24V at TP805. You can also isolate the power supply from the main board by shorting the PS_ON line (usually pin 2 or 3 of CN802) to 5V_SB via a 1kΩ resistor.

To integrate this feature without a custom PCB re-spin, we will use the "Jump-Mod" technique on the 17IPS12.

When something blows (usually a MOSFET or a diode), the schematic helps you trace which components are connected to the gate drive circuit, sense resistors, or feedback loop.

Some 17IPS12 boards are sold as:

Pro Tip: If you download a PDF, always check page 2–5 for the block diagram and component layout. Some service manuals bury the PSU schematic in the last pages.

This indicates a problem in the LED driver stage.

Schematic tip: The OZ9976 datasheet, often included in the schematic PDF, explains the protection pin (Pin 8 – OVP/OCP). Cross-reference with your component layout.