Repair Flow Chart104S CM23 GSIII45
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Basic check
F. TDA4857Vcc=pin9=pin10=12V
Vcc>9V
Check Listgnd =pin7=pin25=0v
during startup
1. HFLBpin16
if no exist
(from H.defl)CLBL=hi
pin17 = Hunlock = floating
pin30 = Hpll2 = 0V
Pin8 = HDRV = floating
2. Xray
if activepin6 = B+DRV = flaoating
(from LOT)
pin12 = Vout1 = floating
pin13 = Vout2 = floating
pin16 = CLBL= Hi
a pin3 amplify pin5 and it compare to pin4
inhibit pin6 output
b. pin4 generate the saw_tooth waveform
3.4.5.6 B+ controlif pin3 is pulled to
c. pin5 input voltage for the square output waveform
ground by 7507
d. pin6 pwm output to 7603 & 7604 base
to H_deflection.
8. HDRV
7605 Gate
to H_deflection
11.EWDRVeast/west control
7505 emitter
V_differential input
12,13 Vout1/Vout2
to 7401 pin 2, 3
14,15the input sync from
Vsync,Hsynccpu pin 20,21
Vertical blank will be activated = hi
1.pin30 = softstart pll2 = 0V
2.pin26 = pll1 is unlock in searching mode
16. CLBL
3.pin1 = HFLB no exist
4.pin2 = Xray once actived
5.pin10 = Vcc < 9V
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