Often, the MOSFET or driver IC powering the LEDs fails.
: Powers the audio system, tuner, and panel electronics once the TV wakes up. 4. The Backlight Boost Circuit 17ips72 schematic work
The standard 12V secondary rail is insufficient to illuminate a long string of series-connected LEDs, which often require anywhere from 30V to over 100V. The 17IPS72 uses a dedicated LED driver IC (such as the MP3394S or similar) operating a boost converter topology (an inductor, a switching MOSFET, a diode, and smooth output capacitors). Often, the MOSFET or driver IC powering the LEDs fails
The 17IPS72 features an integrated LED driver section. The +12V or a separate higher unregulated rail is fed into a boost converter circuit managed by a dedicated LED driver IC (such as the MP3394 or similar). The Backlight Boost Circuit The standard 12V secondary
Check fuse F100. If it is open, check the bridge rectifier diodes and the main switching MOSFET for shorts. If the MOSFET is shorted, the PWM controller IC is likely dead as well. Blinking Standby Light / Constant Rebooting
Need specific help with a 17IPS72 power rail or signal? Leave a comment on our repair forum or consult the Lenovo Hardware Maintenance Manual (HMM) for safe disassembly procedures before beginning your schematic work.