88
Repair Flow Chart
F. TDA4856
Check List
Basic check
Vcc>9V
during startup
11.EWDRV
8. HDRV
14,15
Vsync,Hsync
12,13 Vout1/Vout2
inhibit pin6 output
if pin3 is pulled to
ground by 7427
a pin3 amplify pin5 and it compare to pin4
b. pin4 generate the saw_tooth wave
c. pin5 input voltage for the square output waveform
d. pin6 pwm output to 7422 & 7423 base
pin16
CLBL=hi
if no exist
3.4.5.6 B+ control
1. HFLB
(from H.defl)
to H_deflection.
7425&7426 base
Vcc=pin10=12V
gnd =pin7=pin25=0v
Vertical blank will be activated = hi ,If
1.pin30 = softstart pll2 = 0V
2.pin26 = pll1 is unlock in searching mode
3.pin1 = HFLB no exist
4.pin10 = Vcc < 9V
16. CLBL
to B+ control
east/west control
differential input
to 7567 pin 1, 7
the input sync from
7404 pin 14,15
202P4 M25P
9
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