in both directions, desolder one leg and retest. A shorted secondary diode will pull the power rail to ground, forcing the PWM IC into over-current protection mode (causing a clicking sound or a flashing standby light).
is a widely used power supply board manufactured by , commonly found in LED TVs from brands like JVC, Toshiba, Hitachi, and Telefunken. If you are troubleshooting a TV that won't turn on or has a blinking standby light, this board is often the culprit. Common Faults & Symptoms No Power / Dead TV: 17ips72 schematic work
What is the or the exact version number printed on your 17IPS72 PCB? in both directions, desolder one leg and retest
Check for burn marks around the secondary diodes and the primary PWM IC area. Step 2: Cold Resistance Checks (Power Unplugged) Set your multimeter to continuity mode. Test the main secondary diodes. If a diode reads close to If you are troubleshooting a TV that won't
When opening a 17IPS72 schematic PDF, your troubleshooting workflow should follow the path of power generation.
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:
Once the transformer is actively switching, an auxiliary winding on the primary side generates a localized AC voltage. This voltage is rectified and filtered to take over the job of providing a clean, continuous VCC supply to the PWM controller, disabling the power-hungry internal startup circuit to save energy. 4. Secondary Side: Output Rectification and Feedback