Vestel 17ips62 Schematic New Guide

Vestel 17IPS62 is a widely utilized Power Supply Unit (PSU) found in a vast range of budget and mid-range televisions under brands such as

It is primarily a Switch Mode Power Supply (SMPS) designed to provide the necessary DC voltages (typically LED backlight drive ) from an AC mains input 1. Key Schematic Architecture

The 17IPS62 circuit is generally divided into several functional blocks: EMI/Line Filter

: Uses line filters (LF2, LF4) and capacitors (C104, C105) to reduce electromagnetic interference. Bridge Rectifier : Converts AC input to high-voltage DC (approx. ) using RL207 diodes. SMPS Converter : Driven by a PWM controller IC (often the or similar) and a high-voltage MOSFET (e.g., MMD70R600P ) to drive the primary side of the transformers (TR1, TR2). Secondary Rectification : Output stages provide regulated voltages such as for the mainboard and audio systems. LED Driver Block

: A boost converter circuit that elevates voltage to drive the TV's LED backlights. 2. Common Faults & Troubleshooting

Technicians frequently report specific component failures on the 17IPS62 board: "Blown" Power Supply : Typically caused by a shorted RL207 rectifier diode or a failed chopper . This often blows the 3.15A Wickman fuse No Backlight (Sound Present)

: Often indicates a failure in the LED driver section or a faulty boost converter diode. If the output voltage doesn't rise above the input voltage (e.g., stuck at 24V), the boost circuit is not oscillating. Intermittent Shutdowns

: Can be caused by a faulty parallel diode or drifting resistance in the current-sensing circuit. Low Voltage/Pulsing vestel 17ips62 schematic new

: If voltages like the 12V rail cannot stabilize, it may indicate a faulty oscillator IC or a shorted secondary capacitor. 3. Critical Repair Parts

For those attempting a component-level repair, these are the standard replacement parts often cited in service guides: : 3.15A Wickman Rectifier Diodes : RL207 (Can be upgraded to for better thermal performance). Main MOSFET : MMD70R600P or IPD70R600P. 4. Technical Resources Schematics for various revisions (e.g., 17IPS62-R2 17IPS62-R4 ) can be found on professional repair databases:

The Vestel 17IPS62 is a widely used Power Supply Unit (PSU) found in many 32" to 55" LED TVs under brands like JVC, Hitachi, and Toshiba. This "new" report outlines the critical schematic architecture, key voltage rails, and common failure points for the R2 and R4 revisions. Core Circuit Architecture

The 17IPS62 board integrates the main power converter and the LED backlight driver into a single PCB.

Primary Filter Section: Uses line filters (LF2, LF4) and a bridge rectifier to handle incoming AC.

SMPS Converter: Driven by the FAN6300 controller (U1), which manages the high-voltage switching via a MOSFET (Q1).

LED Driver Section: Often utilizes the MAP3249 IC (U2) to regulate current for the backlight strings. Vestel 17IPS62 is a widely utilized Power Supply

Isolation: Power is transferred across the isolation barrier via transformers TR1 and TR2 to provide low-voltage outputs. Voltage Test Points & Rail Information

When troubleshooting, verify these standard DC voltages on the secondary side:

Main 12V Rail: Measured at the secondary diodes (right side of the board), this powers the motherboard. VLED / Backlight Supply: Standby/Unloaded: Typically measures around 30V–35V.

Active (Loaded): Can jump to 66V+ depending on the LED strip configuration.

High Voltage Primary: Approximately +400V DC across the main filter capacitor if PFC is active. Common Failure Points

Diodes (Secondary Side): Diodes like the SB5100 (D10) frequently fail short, causing the TV to remain in standby or have no power.

Capacitors: Filtering capacitors (C57, C38, C39) can bulge or lose ESR, leading to unstable 12V or 24V rails and flickering backlights. URL: elektroda

LED Driver Protection: If the backlight LEDs are faulty, the MAP3249 will enter protection mode, dropping the LED voltage to the base level (~30V) to prevent further damage. Service Documents

Full technical schematic diagrams for different revisions can be found on community platforms:

Revision R2: Available on Scribd - 17IPS62-R2 and Elektrotanya - R2 PSU SCH.

Revision R4: Specifically covers newer component layouts; see Scribd - 17IPS62-R4.

Warning: The primary section of this board contains live mains voltage (up to 400V DC). Always discharge the main capacitor and keep fingers away from the "hot" side of the board while powered. Vestel 17IPS62 Schematic Overview | PDF - Scribd

2. Elektroda Datasheet Archive

  • URL: elektroda.com
  • Tip: Requires a free login, but the schematics are often original service manuals, not re-draws.

The PFC Controller

The heart of the Power Factor Correction stage is likely a Controller IC (often an LD7585 or equivalent derivative).

  • Function: It monitors the mains input via a divider network and switches the PFC MOSFET to maintain a steady DC Bus voltage (typically 390V–400V).
  • Schematic Critical Point: Look for the PFC diode (a ultra-fast recovery diode) and the PFC coil. In many Vestel schematics, if the PFC voltage sits low (around 300V), it indicates the PFC stage is not running, often due to the controller not receiving a "PFC_ON" signal from the main CPU.

Fault #3: Low PFC Voltage (TV clicks but no start)

  • Schematic action: Measure after D807. You should have 380V – 400V. If you have 320V, the PFC is dead.
  • Check: Using the schematic, probe IC801 (PFC controller). Check Vcc (Pin 8 on NCP1608). It should come from the standby transformer via D805.
  • Fix: Replace Q801 (MOSFET) and D807 (Diode). Also check R875 (Current sense resistor – often 0.22Ω).

7. Troubleshooting Without a Schematic (Quick Guide)

If you cannot locate the exact schematic, use these general steps based on known 17IPS62 topology:

| Symptom | Likely Area | Component Check | |---------|-------------|------------------| | No power, fuse blown | Primary side | Bridge rectifier, main MOSFET, PFC diode | | Standby LED on, but no backlight | LED driver | Check LED current sense resistors, boost MOSFET, LED connector voltage | | TV turns off after a few seconds | Over-voltage protection (OVP) | One or more LED strings open – measure LED+ voltage | | Buzzing noise, no picture | PFC stage | Check PFC controller, feedback resistors, bulk capacitor |

Major schematic sections

  • AC input & EMI filter: AC mains entry, fuse, thermistor (NTC), common-mode choke, safety capacitors and varistor for surge protection.
  • Rectification & bulk DC: Bridge rectifier and large electrolytic capacitors forming the high-voltage DC rail (approx. 310–400 VDC depending on input).
  • Primary switching (SMPS) / PWM controller: High-voltage switch (often an N-channel MOSFET or integrated switch IC) driven by a PWM controller IC; includes driver, snubber network, and primary-side protections.
  • Auxiliary winding & standby supply: Small windings on the main transformer or separate auxiliary converters providing 5VSB / 12VSB for standby logic and the microcontroller.
  • Optocoupler feedback and TL431 circuit: Regulation loop from secondary to primary using an optocoupler and reference (TL431 or similar) for output voltage regulation and protection.
  • Secondary DC supplies: Multiple secondary rails (e.g., 12V, 5V, 3.3V) with rectifiers, inductors, and post-regulation (LDOs or DC–DC converters) feeding the main board and peripherals.
  • Inrush/soft-start & protections: Soft-start circuitry, overcurrent/overvoltage/overtemperature protections, and reset circuits.
  • IR / T-Con / Backlight drivers (if present): Sections driving LED backlight or CCFL, or interfacing to T-Con board for panel signals depending on model.

5. Reading the Schematic: Key Test Points

If you have the schematic (PDF or image), locate these test points:

  • TP_STBY – Standby voltage (should be stable 5V or 3.3V).
  • TP_PFC – After PFC (should read ~380-400V DC).
  • TP_VCC – Supply to main SMPS controller (typically 12-18V).
  • TP_LED+ – Boosted LED voltage (varies from 60V to 180V depending on LED strip count).
  • PS_ON – Power-on signal from main board (usually 3.3V to enable main SMPS).

4. PFC (Power Factor Correction) Stage

  • IC: IC801 (Commonly an NCP1608 or FAN7930).
  • MOSFET: Q801 (Typically a 600V/11A FET like STP11NK60Z).
  • Diode: D807 (Ultrafast diode, e.g., STTH8R06).
  • Function: Boosts 325V to ~390V. Without PFC, the TV will not start.

Repair tips & safety

  • Always discharge capacitors and isolate mains before touching the board. Use an isolation transformer when powering for diagnosis.
  • Replace electrolytic capacitors with low-ESR, same or higher temperature rating (105°C preferable).
  • Use proper surge-rated safety capacitors and replace MOVs/varistors if visibly damaged.
  • When replacing PWM ICs or MOSFETs, check associated gate drivers, resistors, and snubber components; replace in pairs if suspicious.
  • Reflow joints around heavy components and check for cracked solder on connectors and transformers.
  • If you replace the optocoupler, ensure correct orientation and match CTR if possible.