Next, check EC_RST# (EC Reset). Pin 102 of EC. Must be 3.3V constantly. If it pulses or is 0V, the +3VLP rail is unstable or the reset capacitor (C8802) is leaky.
If the TV has sound but no picture, the LED driver section of the 17IPS72 may have failed components, such as shorted capacitors or a faulty driver IC. Troubleshooting Checklist Visual Inspection: 17ips72 schematic work
Download the official 17IPS72 R02 schematic and the matching .BRD boardview file. Practice locating the +3VLP test point and tracing the PWRBTN#_EC signal. Your first successful repair is just a few continuity checks away. Next, check EC_RST# (EC Reset)
is your TV showing—does it have a standby light, or is it completely dead? AI responses may include mistakes. Learn more 17IPS72 Repair If it pulses or is 0V, the +3VLP
| Symptom | Likely Cause | Schematic Area to Inspect | |---------|--------------|---------------------------| | Motor does not spin, IC hot | Shorted low-side MOSFET inside 17IPS72 | Check resistance between phase pins and GND – should be >10kΩ | | Motor spins briefly then stops | Overcurrent trigger or missing back-EMF | Verify sense resistor (pin 23) and all three phase connections | | No FG pulse, motor spins at constant wrong speed | Bad VREF pin or missing PWM signal from controller | Scope pin 32 – should see 0V to 3.3V analog or PWM waveform | | Spindle vibrates but doesn’t rotate | Single phase open circuit | Check continuity from each output pin to motor connector | | IC dead short across Vm to GND | Catastrophic MOSFET failure | Desolder IC; check if short disappears from PCB |
: You can find detailed schematics for various revisions (e.g., R3, R4) on sites like Elektrotanya
Obtain these files from reputable repair forums or official sources. Avoid malicious "free download" sites that may contain malware.