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Repair flow chart 104S CM23 GSIII 39
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A. Power Supply Failure




1. Sympton :
check 7103 pin7 check 7103
no startup sound Ok
100V LED light off

NO Ok

check check
NO
1101/6101/ 6115/3125/
7102/2105 3126/7102


check
check
replace 7103 7112/7104
Pin2>2.5V
/6111



Turn power off
2. Sympton :
check the resistance for
hicup mode with check 7103
all output voltages+180, OK
startup sound or pin 3 normal ?
80,12,-12,+6,+5,+8 V
blinking LED
check 6172/6157/6158
6160/6161 short? No

OPP possibly active
check 3125,3116,3117,
3118,6110,6109
OK



replace 5110




7103 pin7
check 7156 pin3 check 7156 pin1
Ok No possibly active by
voltage dip
7153 pinC shorted

No
Ok
check
check check CPU pin 10
7160/7161
+8V loading current and 7809 Base
7112/7123



check check 7102 check
3. Sympton:
frequency Ok drain waveform No 6105/3111
abnormal sound
[email protected] right? 2107/2126

No Ok

Check replace 5110
3131,2110,2111
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40 104S CM23 GSIII Repair Flow Chart
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rough check for R,G, B
B.Video 1. video input= 0.7V
Repair Flow 2. 7099video output waveform check blanking
3. 1005 video output waveform 7501 pin16

Ok
check
1.Sympton :
R,G,B output
(with wite pattern) check heater check check
Ok No 1005 pin11
no picture =+6V EHT=24.5KV VG1 < -178V
1005 pin8
green LED on
1005 pin6
No
Ok
check Xray prot.
7501 pin2 check DC restoration
check
7013,,7033,7053
VG2 > 350V
7014,7034,7054


check blanking
7051 pin16

Ok
2.Sympton :
no video (or dim), check Vg1 check cathod
No turn down Vg2
only raster with/without retrace line Vg1 = 0V +80V,+180V
green LED on

check 7011,
check 7099 7031,7051 check 7012,7032,7052
check 7099 pin24
Ok pin 6,8,10 pin Base Pin Collector
ABL
input swing input swing Swing

No

replace IF
check 7099 cable
pin11 HFLB




check Check 7099
No Ok replace 7099
7501 pin16 pin5 CLBL




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Repair Flow Chart 104S CM23 GSIII 41
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C. Horizontal deflection
output repair flow :




1. Sympton :
check B+DRV check B+DRV check H-Output
without
7623 gate 7621 base 7501 pin8
H-deflection.




check check B+DRV check B+DRV
replace 5612 Ok Ok
180V 7623 drain 7501 pin6

No No

check
refer to 7501 check list
6631,6632,3642
or replace 7501

check 2629, check
2. Sympton : 2610 7610,7611, check 7501
East /West parabola pin11 Refer to 7501
7612 check list
corr. exist parabola exist parabola exist




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42 104S CM23 GSIII Repair Flow Chart
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basic check
D. Vertical Deflection Failure
+12/-12V




Sympton : check
check
one horizontal line 3403,3410
Ok 6401,6403
V_size is abnormal Good? Good?
too large/small


No No
Ok

Check Replace
7401,3403,3410 7401,6401,6403




check 7401
check
Ok pin2,pin3 ramp
2406,2413
exist ?


No


check
7501




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Repair Flow Chart 104S CM23 GSIII 43
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check cpu pin4=5V
E. CPU
Basic Check Pin6/pin7=4MhZ
check list
Pin5=gnd




check pin2
ABL-CON
pwm from 0V to 5V




Hor. Freq.(KHz) Q3 Q2 Q1
11,12,13 check Q1-Q3 ~27.00 0 0 0
27.50~33.24 0 0 0
(Q3,Q2,Q1) Pin13/pin12/pin11 33.24~36.51 0 0 1
low : 0 36.51~42.38 1 1 0
S-cap switch hi :1 42.38~47.48 1 0 1
47.48~53.10 1 0 1
53.10~58.25 1 1 1




1. Normal
check sync. Fvout=Fvin
27,28,21,20 Hin=pin27 Fhout=Fhin
Vin=pin28
Hsync/Vsync Hout=pin21 2. sync out of rang
Vout=pin20 Fhin>54KHz
Fvin>120Hz




check pin10
10. Hunlock normal=Hi
blank=low




pin14 pin17
14, 17 P.S. normal hi hi
check pin14/17
LED standby low hi
off low low




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44 104S CM23 GSIII Repair Flow Chart
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check
24. Degauss Active=low
no active=hi



check check
3. Reset
from 5V to 0V 7808/6813/3812




check key Check
19. Keypad 3838~3844
+,-,H-Shift,H-Size,V-Shift,V-Size keys




check pin26
1.no H/V sync & IF cable pin5 floating - show msg.
26. Selftest 2.H/V sync exist & IF cable pin5 to ground - normal
3.H/V sync non-exist & IF cable pin5 to gnd - power saving




check idle status
8,9. DDC bus Sda=pin9=hi
Scl=pin8=hi




check
check idle status 7806 24W04
22,23. IIC bus Sda=pin22=hi 7501 TDA4857
Scl=pin23=hi 7099 TDA4886




check pin15 pin16
15,16. EEPROM write : low hi
write protection read : don't care
normal : hi low




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Repair Flow Chart 104S CM23 GSIII 45
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Basic check
F. TDA4857 Vcc=pin9=pin10=12V
Vcc > 9V
Check List gnd =pin7=pin25=0v
during startup




1. HFLB pin16
if no exist
(from H.defl) CLBL=hi



pin17 = Hunlock = floating
pin30 = Hpll2 = 0V
Pin8 = HDRV = floating
2. Xray
if active pin6 = 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+ control if 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.EWDRV east/west control
7505 emitter



V_differential input
12,13 Vout1/Vout2
to 7401 pin 2, 3




14,15 the input sync from
Vsync,Hsync cpu 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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46 104S CM23 GSIII Repair Flow Chart
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Hunlock pin is floating while pll1(pin26) is
17. Hunlock
unlock in searching mode




19. IIC sda = hi the initial failure may be these
18. IIC scl = hi of IC 7501,7099,7801,7806




compensate for the V_size
21 EHT_compen.
owing the load variation




22,23,24 pin22 determin the AGC
50Hz< freq. <120Hz
VAGC,VREF ,VCAP pin23,pin24 determin frequency




pin26 determin the
26,27,28,29 pll1 loop filter
30K Hpll1,Hbuf,Href, Hcap pin 27,28,29 H-Freq
working range




1.compare the HFLB(7501 pin1) and control the phase of H-Output(7501 pin8)
30. PLL2
2.softstart




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