IC100: Main PWM Controller (e.g., MP3394S or similar). D100/D101: Main rectifier diodes (often STPS20H100CFP). Q103/Q104: Switching MOSFETs.
A very specific request!
What is your television showing? (e.g., dead, blinking light, sound but no picture)
Secondary Schottky diodes (often shorted), leaky electrolytic capacitors. Failed LED driver circuit or open-circuit LED strips. vestel 17ips12 schematic
These components toggle the high voltage at high frequency through the chopper transformer to start the step-down process. B. The Secondary Side (Cold Side)
The high-frequency magnetic field in the transformer induces lower AC voltages in the secondary windings.
The Schottky rectifiers on the secondary side endure high thermal stress. Check diodes like D202, D203, or D204 (specific designations vary slightly by revision) for shorts. A shorted secondary diode will trigger the PWM controller's over-current protection, causing the power supply to repeatedly restart (power cycling). IC100: Main PWM Controller (e
A large electrolytic capacitor (typically rated at 450V, 68µF to 150µF depending on screen size). In standard operation, you should measure approximately 320V to 340V DC across this capacitor in standard 230V regions, or around 160V to 170V DC in 110V regions. Note that the 17IPS12 generally lacks an active PFC (Power Factor Correction) step-up circuit, making troubleshooting the primary side significantly simpler. Pulse Width Modulation (PWM) Switching Stage
Takes 220V-240V AC, filters noise, and rectifies it to high-voltage DC (~320V-380V DC).
Connects directly to the AC mains. It contains the transient filtering, bridge rectifier, main filter capacitor, and the switching controller circuit. This side deals with lethal voltages (up to 400V DC). A very specific request
Driven by the PWM IC, this transistor switches the 320V DC on and off through the primary winding of the main transformer at a high frequency (usually between 50kHz and 100kHz). 4. Secondary Rectification and Output Rails
What are you getting at the main capacitor and secondary outputs?
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