Acer AC 711 Manual de serviço - 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
L
L
L
H
L
L
36K<F<41K
41K<F<52K
L
H
H
L
H
L
17
+
voltage.
52K<F<58K
58K<F<65K
H
H
L
H
H
L
65K<F
H
H
H