Vestel 17IPS72 Schematic Download, Faults, and Repair Tips for Hitachi, JVC, Toshiba TVs

User question

17ips72 shema

Artificial Intelligence Response

Direct answer to the question

• The complete schematic (“shema”) for the Vestel 17IPS72 (all revisions – R2, R3, R4) can be downloaded free of charge from reputable service-manual repositories such as ElektroTanya and CiklonElectro, or viewed on document-sharing sites like Scribd.
• Most service manuals for TV models that use this PSU (e.g. Hitachi 49HK6T74U, JVC LT-49C870, Toshiba 32W1333DG, etc.) embed the 17IPS72 schematic in the “Power Supply” chapter.
• If you cannot obtain the full PDF, block diagrams, component lists, and typical IC application circuits (NCP1271, FAN7930B, L6562D, etc.) allow effective troubleshooting.

Key public links (checked 2024-05):

1. Hitachi 49HK6T74U Service Manual (includes 17IPS72-R4) – https://elektrotanya.com/hitachi_49hk6t74u_49293dlb_chassis_17mb120-r2_17ips72_sm.pdf/download.html
2. 17IPS72-R4 stand-alone schematic – https://www.ciklon.org/en/downloads/schematics/tv/download/699-vestel/63911-17ips72-r4
3. View-only copy – https://www.scribd.com/document/489381073/17IPS72-R4-pdf

(If a link is temporarily unavailable wait ~30 s on ElektroTanya or create a free account on CiklonElectro; all files are in PDF format, ~4–9 MB.)

Detailed problem analysis

1. Functional blocks on 17IPS72

1. EMI / bridge rectifier / inrush NTC
2. PFC boost stage – L6562D or FAN7530 controller, typically 385–400 VDC output
3. Quasi-resonant (QR) fly-back standby SMPS – NCP1271 controller, delivers 5 Vsb
4. LLC half-bridge main converter – FAN7930B (or ICE2HS01) producing 12 V, 24 V rails
5. Secondary synchronous/Schottky rectification, feedback via TL431 & opto-couplers
6. LED back-light driver – SEPIC or boost type (integrated), current-mode with dim-enable line
7. Protection and housekeeping – OVP, OCP, OTP, “PS-ON / BL-ON” logic from main board

2. Typical component identifiers

Primary MOSFETs: MDF14N60, MDF11N65 or equivalent
PFC MOSFET: FDPF18N60 or STF13N60
Stand-by fly-back MOSFET: STD7NM60
Main bulk capacitor: C901 450 V / 82–100 µF
High-frequency LLC transformer: T802
Opto-couplers: PC817 (U705, U706)
Critical HV startup resistors: R805/R806 (150 kΩ, 0.5 W) often go high-value

3. Frequent failure modes

• No power / dead set: open input fuse F601 caused by shorted primary MOSFET or bridge; shorted PFC diode D614; open startup resistors.
• Stuck in standby (5 Vsb only): secondary short, bad opto U705, dried 5 Vsb capacitor C707 (47 µF/50 V).
• Cycling on/off: degraded bulk cap C901, marginal PFC loop, or LED-driver OVP.
• Back-light flicker / no display: open LED string, short in LED driver MOSFET Q851, or aged LEDs causing OVP trip.

4. Troubleshooting approach without full schematic

1. Verify 5 Vsb with TV unplugged then re-energized – should be 5 V ± 5 %.
2. Confirm PFC output ≈ 390 V DC when PS-ON is high.
3. Check 12 V and 24 V rails once main board asserts PS-ON; if missing, probe gate drive at Q802/Q803 (LLC half-bridge).
4. Inspect electrolytics with ESR meter; any > 1 Ω at 100 kHz on secondary side replace.
5. Use freeze-spray/heat-gun on opto-couplers and TL431 to locate intermittent OVP/OCP triggers.

Current information and trends

• Vestel has migrated newer TV chassis (17IPS12x series) to highly-integrated PFC+LLC combo ICs (e.g., SSC9522) to cut component count; however 17IPS72 remains widely serviced in European repair shops.
• Availability of low-ESR 105 °C polymer capacitors is improving; retro-fits substantially increase PSU lifetime.
• LED backlight retrofit strips (24 V constant-current) exist as drop-in replacements, bypassing aging internal driver.

Supporting explanations and details

• L6562D PFC stage: follows average-current-mode. Expected boost inductor ripple ≈ 1.2 A_pk-pk.
• FAN7930B LLC: operates between 50–160 kHz; design uses resonant tank Lr ≈ 130 µH & Cr ≈ 33 nF.
• Startup: a ~1 MΩ path from bulk cap feeds VCC pin of NCP1271 until auxiliary winding takes over.

Ethical and legal aspects

• Vestel schematics are copyrighted. Redistribution is restricted; downloading for personal repair is generally tolerated under EU “right-to-repair” directives, but do not post full PDFs publicly without permission.
• Always isolate the primary side when probing live – lethal 325-400 V present. Use an isolation transformer and OSHA-compliant PPE.

Practical guidelines

Implementation / repair best-practice:

1. Discharge C901 via 10 kΩ/5 W resistor before any soldering.
2. Replace primary MOSFET and startup resistors as a kit; always pair with new gate-snubber network.
3. When substituting capacitors choose ≥ 600 mA ripple @ 100 kHz, ESR < 0.05 Ω, 105 °C.
4. After repair, run a 2-hour soak at 230 VAC with 80 % load; confirm thermals < 90 °C on hottest heatsink.
   Challenges: fine-pitch SMD opto-couplers and Hall effect LED-current sensor require hot-air station or pre-heater.

Possible disclaimers or additional notes

• Board photos on the web may show different revision silkscreen; always cross-check your board’s “23151437” (or similar) Vestel part number.
• Some PDFs omit back-light driver details; if missing, refer to Vestel “LED driver 6632L-0653A” generic schematic – topology is identical.

Suggestions for further research

• Investigate replacing bulky electrolytics with hybrid polymer types to improve MTBF.
• Study GaN-based retrofit modules (e.g., LMG3410R050 evaluation) for higher efficiency PFC in legacy sets.
• Follow IEC 62368-1 3rd Ed. changes that will affect future TV PSU design.

Brief summary

The Vestel 17IPS72 schematic is freely obtainable from sites such as ElektroTanya and CiklonElectro; once downloaded it reveals a conventional PFC + fly-back standby + LLC architecture. Understanding the functional blocks and common failure points (startup resistors, MOSFETs, electrolytic capacitors, LED driver) enables efficient component-level repair even if the exact “shema” is temporarily unavailable. Always observe high-voltage safety, respect copyright, and cross-verify board revision before applying any schematic values.

Disclaimer: The responses provided by artificial intelligence (language model) may be inaccurate and misleading. Elektroda is not responsible for the accuracy, reliability, or completeness of the presented information. All responses should be verified by the user.