If VDD is present but the RESET pin or SDA/SCL lines are pulled low, the processor cannot load its firmware from the EEPROM.
| Pin(s) | Function | Normal Voltage | Oscilloscope Signature | |--------|----------|----------------|-------------------------| | 16 | Upper gate drive (HO) | 0V / 5V (or 8V) | Square wave, 1 MHz, amplitude = bootstrap voltage | | 17 | Bootstrap supply (BST) | 4.5V to 8.5V (above SW) | Floating; measure relative to pin 19 | | 19 | Switch node (SW) | 0V to Vin (e.g., 12V) | Fast edges, ringing typical | | 21 | Lower gate drive (LO) | 0V / 5V (or 8V) | Complementary to HO, dead time >20ns | vct49x3f pz f1000 pin voltage
To find pin voltages and a full feature list, please provide: If VDD is present but the RESET pin
The "PZ F1000" suffix typically refers to the specific firmware revision or package type. Since this chip acts as the "brain" of the television, it requires precise power sequencing and clock signals to function. If these conditions are not met, the pin voltages will read incorrectly, leading to a misdiagnosis of a bad chip when the actual culprit might be a dried-up capacitor or a broken crystal. If these conditions are not met, the pin
: Operates with a single 20.25 MHz reference crystal.
Verify the analog supply (VDDA) and the signals on the RGB output pins.
If VCC is absent, check an external low-dropout regulator or a bootstrap capacitor between pin 18 and pin 17.