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F. TDA4841
Check List
1. HFLB
(from H.defl)
2. Xray
(from LOT)
3.4.5.6 B+ control
8. HDRV
11.EWDRV
12,13 Vout1/Vout2
14,15
Vsync,Hsync
16. CLBL
Repair Flow Chart (Continued)
Basic check
Vcc=pin9=pin10=12V
Vcc > 9V
gnd =pin7=pin25=0v
during startup
if no exist
pin17 = Hunlock = floating
pin30 = Hpll2 = 0V
pin6 = HDRV = floating
if active
pin8 = BDRV = flaoating
pin12 = Vout1 = floating
pin13 = Vout2 = floating
pin16 = CLBL= Hi
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 7601 & 7602 base
to H_deflection.
7605 base
to H_deflection
east/west control
7612 base
differential input
to 7401 pin 1, 7
the input sync from
cpu pin 33,34
Vertical blank will be activated = hi
1.pin30 = softstart pll2 = 0V
2.pin26 = pll1 is unlock in searching mode
3.pin1 = HFLB no exist
4.pin2 = Xray once actived
5.pin10 = Vcc < 9V
pin16
CLBL=hi
M32 107E4 GS_3
51
Go to cover page
inhibit pin6 output
if pin3 is pulled to
ground by 7508
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