Acer AC 711 Manual de servicio - Página 17

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5. DEFLECTION

A. SYNC RPOCESSOR:

H-sync & V-sync input to U1(up), then up output the H-out, V-out signal to U401 TDA4856.

The H-out, V-out always are positive.

B. HORIZONTAL PROCESSOR

Fig 3 is the block diagram of IC TDA4856.

The IC TDA4856 output vertical sawtooth and H-Drive signal to produce, H.V deflection.

Meanwhile TDA4856 output. BDRV signal (IC pin 6) that can control B

C. VERTICAL OUTPUT

Fig 4 is the block diagram of IC TDA8172.

Input vertical sawtooth signal from TDA4856 to TDA8172, then TDA8172 produce vertical

deflection current.

D. HORIZONTAL OUTPUT STAGE

SW1

SW2

SW3

E. FLYBLACK TRANSFORMER

In the primary of F.B.T, there is about 1000Vpp in the LC resonant interval, It convert to the

secondary of F.B.T to produce about 25.3KV for CRT anode voltage.

F<33K

33K<F<36K

36K<F<41K

41K<F<52K

voltage.

52K<F<58K

58K<F<65K

65K<F