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Repair Flow Chart 105E CM23 GSIII 61
9 Go to cover page
A. Power Supply Failure
1. Sympton :
check 7102 pin1 check 7102 check 7102 check 7102
no startup sound Ok Ok Ok
100V 2V pin 8=2.4V pin4 output ?
LED light off
NO NO NO Ok
check check check
replace 7102 6165/3107/ NO
1101/6101/ 3121/6112/1106
7101/2106 3123/3119/3125 3105/7101
check
check
replace 7102 3115/6107
pin6>8V
/6111
Turn power off
2. Sympton :
check the resistance for
hicup mode with check 7102 check 7102
all output voltages+180, OK
startup sound or pin 6 < 13.5V pin 5 < 0.5V
80,12,-12,-6,+5,+8 V
blinking LED
check 6131~6136 short?
No No
OPP possibly active
check check 7111 OVP possibly active
No check 3103,3111~3114
7112/7115/7116/7117 open circuit check 6111
3108,3109,6102,2121
OK
Ok
replace 5113 replace 5113
7102 pin14 OOB
check 7153 pin3 check 7153 pin1
Ok No possibly active
voltage dip 11V< pin1 < 15V
short 7116 pinC
No
Ok
check
check check CPU pin 22
6144/3146/3147
+5V loading current and 7805 emitter
3148/7117/2142
check check 7101 check
3. Sympton:
frequency Ok drain waveform No 6103/3104
abnormal sound
F=77KHZ right? 2107/2111
No Ok
adjust
replace 5113
3129
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62 105E CM23 GSIII Repair Flow Chart
9 Go to cover page
rough check for R,G, B
B.Video 1. video input= 0.7V
Repair Flow 2. 7099video output =2.5V check blanking
3. 7099 video output > 35Vpp 7099 pin16
Ok
check
1.Sympton :
R,G,B output
(with wite pattern) check heater check check
Ok No 30<2725<80
no picture = - 6.3V EHT=25KV VG1 < -150V
30<2733<80
green LED on
30<2753<80
No
Ok
check Xray prot.
7099 pin2 check DC restoration
check
7013,,7033,7053
VG2 > 450V
7014,7034,7054
check blanking
7099 pin16
Ok
2.Sympton :
no video (or dim), check Vg1 check cathod
No turn down Vg2
only raster with/without retrace line Vg1 = 0V +78V,3779
green LED on
check 7099 check 7099 check 7099
check 7099 pin24
Ok pin 6,8,10 pin 6, 7,9 pin 1,2,3
2V< ABL < 5V
input swing input swing output swing
No Ok
replace IF
check 7099 replace 7099
cable
pin11 HFLB
check check 7099
No Ok replace 7301
7501 pin16 pin5 CLBL
3. Sympton : check check 7099
check 7099
no OSD or No 7099 pin10 pin2 VCO
pin 2,3,4 input
OSD out of sync. VFLB pin3 RP
Ok
check check check 7099 check 7099
Ok Ok
7099 pin12 7099 pin1 pin5 HFLB pin 7,8(IIC)
No No
replace 7099 replace 7099
3Back Forward4
Repair Flow Chart 105E CM23 GSIII 63
9 Go to cover page
C. Horizontal deflection
output repair flow :
1. Sympton :
check Hsync check Hsync check Hsync
without
7606 base 7605 base 7501 pin8
H-deflection.
check check Hsync check Hsync
replace 5612 Ok Ok
180V 7603 drain 7501 pin6
No No
check refer 7501 check list
6602,7601,7602 or replace 7501
2. Sympton : check 2625 check check 7501
refer 7501
East /West parabola 7611 ~ 7613 pin11
check list
corr. exist parabola exist parabola exist
3. Sympton : enter factory mode check
check
H-linearity check linearity data 3655~3656
3643 / 3649
(full freq. range) in eeprom 7614~7616
check cpu
7801 replace 5611
pin 4,5,6,42
check cpu
4. Sympton : check check 7621 check
7801 pin29
Rotation 7682,7683 pin 1,2,3,4,8 3681/3698
control range
check check cpu
5. Sympton : check
7617,7618 7801 pin28
H_dc shift 7607,7608
3605 control range
enter OSD
6. Sympton : check check check
function
Focus 7685collector 7501 pin 32 5671
disable morier
3Back Forward4
64 105E CM23 GSIII Repair Flow Chart
9 Go to cover page
basic check
D. Vertical Deflection Failure
+12/-12V/+80V
Sympton : check
check
one horizontal line 3401,3402
Ok 6405,6402
V_size is abnormal 3407,3408
good?
too large/small (small) good
No No
Ok
check check
7401 7401
check 7501
check
Ok pin2,pin3 ramp
3412,3413
exist ?
No
check
7501
3Back Forward4
Repair Flow Chart 105E CM23 GSIII 65
9 Go to cover page
check cpu pin11/ pin32= 5V
E. CPU
Basic Check pin9/pin10=12MhZ
check list
pin12/pin31=gnd
H size compensation for
3. H-EHT
the load variance
Fh-khz Q1 Q2 Q3
<27.00 0 0 0
check Q1-Q3 27.50~33.24 0 0 0
4,5,6 (Q3,Q2,Q1) pin11/pin12/pin13 33.24~36.51 0 1 0
S-cap switch low : 0 36.51~42.38 1 0 0
hi :1 42.38~47.48 1 0 1
47.48~53.10 1 1 0
53.10~58.25 1 1 1
1 . Normal
Fhout=Fhin
check sync. Fvout=Fvin
Hsync_in=pin27 2. Self test
13~17 Hsync / Vsync Vsync_in=pin28 Hout=46.875Khz
Hsync_out=pin21 Fvout=75Hz
Vsync_out=pin20 3.sync out of rang
Fhin>72.8
Fvin>168Hz
check pin10
18. Hunlock normal=Hi
blank=low
check pin3
19. Blanking normal : low
change timing : Hi
power saving pin14 pin17
21, 22 P.S. pin 14 STBY normal hi hi
LED pin 17 OFF standby low hi
off low low
check pin24
23. Degauss active=hi
no active=low
check pin 3 check
26, Reset
from 5V to 0V 2814 / 6811 / 3834
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66 105E CM23 GSIII Repair Flow Chart
9 Go to cover page
check pin2
30. ABL-CON
output from 0V to 5V
check key check 3836, 2821
33. Keypad
Enter,Up,Down,Left,Right keys 3891~3895
check pin26
1.no H/V sync & IF cable pin5 floating - show msg.
2.H/V sync exist & IF cable pin5 to ground - normal
34. Selftest
3.H/V sync non-exist & IF cable pin5 to gnd -power saving
4.connect a 15k resistor with IFcable pin5 -factory mode
5.connect a 5k1 resistor with IF cable pin5 - burn in mode
check idle status
check
36,37. DDC bus sda=pin36=hi
7804 24LC21
scl=pin37=hi
check
check idle status 7803 24LC16
38,39. IIC bus sda=pin38=hi 7501 TDA4841
scl=pin39=hi 7304 MTV018-27
7301 TDA4886
check 7803 pin 15,16
40, VCLK
Low : write enable
EEPROM
Hi : write disable
check pin25
42. Shift_LED
output from 0V to 5V
3Back Forward4
Repair Flow Chart 105E CM23 GSIII 67
9 Go to cover page
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
pin6 = HDRV = floating
2. Xray
if active pin8 = BDRV = 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 wave
3.4.5.6 B+ control if pin3 is pulled to
c. pin5 input voltage for the square output waveform
ground by 7508
d. pin6 pwm output to 7601 & 7602 base
to H_deflection.
8. HDRV
7605 base
to H_deflection
11.EWDRV east/west control
7612 base
differential input
12,13 Vout1/Vout2
to 7401 pin 1, 7
14,15 the input sync from
Vsync,Hsync cpu pin 14,17
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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68 105E CM23 GSIII Repair Flow Chart
9 Go to cover page
Hunlock pin is floating while pll1(pin26) is
17. Hunlock
unlock in searching mode
18. IIC sda = hi the initial sequence of IIC IC
19 IIC scl = hi 7501,7301,7304
compensate for the V_size
21 EHT_compen.
owing the load variation
22,23,24 pin22 determin the AGC
50Hz< freq. <160Hz
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 and control the phase of HDRV
30. PLL2
2.softstart
31 EHT_compen. compensate for the H_size owing the load variation
32. Focus to 7685 for the V dynamic focus
3Back Forward4