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The LA7840 is a field deflection output integrated circuit produced by Sanyo. The circuit uses a DC-coupled input. The video signal processing circuit controlled by the bus, such as the LA76810 output field sawtooth voltage, is amplified by the LA7840 to directly drive the field deflection coil.
The internal circuit of LA7840 includes sawtooth voltage operational amplifier, overheat protection circuit, pump power supply circuit and so on. Operating current is 1.8A for small screen TVs. The chip has low power consumption, small crossover distortion, single power supply, and simple structure and few external components.
| Pin number | Label | Features | Voltage value V | Resistance to ground k | ||
| Black pen grounding | Red pen grounding | |||||
| 1 | GND | Ground | 0 | 0 | 0 | |
| 2 | V OUT | Field scan output | 12.5 | 1.0 | 1.0 | |
| 3 | VCC2 | Pump power supply voltage input | 24.8 | 6.3 | & | |
| 4 | NON-INV IN | Field sawtooth voltage input | 2.5 | 2.2 | 2.5 | |
| 5 | INV IN | Inverting input | 2.5 | 4.4 | 4.1 | |
| 6 | VCC | voltage | 24.3 | 6.3 | 18.5 | |
| 7 | PUMP UP | Pump power output | 1.9 | 7.5 | 35 | |
Measuring model for Hisense TC2199A using MF10B multimeter online resistance using R1k block
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September 19, 2022
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