Service Manuals, User Guides, Schematic Diagrams or docs for : Philips Monitor CD 2001 Monitor CD 2001 E-MANUALS Philips crt 105b2 105b2_pdf p43_50r
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Repair flow chart 105B2 CM23 GSIII 43
9 Go to cover page
A. Power Supply Failure
Sympton: check 7103
check 2105 check 7103
no startup sound Y Y pin 4 osc.
100V< C2105<380V pin8 = 5V
LED light off freq=40Khz
N N N Y
check check
check
1101/1102/ 2110/2111/
3135/6106/7103
6101/7102 3108/3131
check OVP check
check 7112 check 7103 check 7103
Y 7106 / 7107 Y 7103 /7104 Y N
pin 1,2,4,5 pin1 = 0V pin6 output ?
latch? short
Y
check
6115/3113/
3125/7102
Sympton: check check
startup failure 6172/6157/6158/ +180,80,5,12, check 7103
N N
LED blinking 6160/6161/6112 -12, 8, 6 pin 3 > 1V
Burst sound short short
Y N
OPP possibly active
replace 5110 check 3116 /3117 /
3118 / 3122
check
check 7501 check 7801
H-deflection
Hunlock pin17 Stby pin14
during startup
3Back Forward4
44 105B2 CM23 GSIII Repair Flow Chart
9 Go to cover page
check R,G, B input / output
B.Video 1. video input= 0.7V
Repair Flow 2. 7301video output =2.5V
3. 7701 video output= 35V swing
1.Sympton :
( input a white pattern signal ) check check check
Ok
no picture heater = 6V EHT=25KV VG1< -100V
green LED on
N Y
check Xay-prot. check N
7501 pin2 7501 pin17
check R,G,B output
check 30<2725<80
check CRT Ok Y
VG2 > 400V 30<2733<80
30<2753<80
N
check DC restoration
check blanking
7722,7732,7752
7501 pin16
7721,7731,7751
Ok
2.Sympton :
check VG1 turn high check +80V
no video ( or dim ) N
VG1 <-100V VG2 supply
only raster with green LED
N
check 7301 check 7301 check 7701 check 7701
pin24 Ok pin 6,8,10 pin 8,9,11 pin 1,3,5
2V< ABL < 5V input swing input swing output swing
No Ok
check 7301 check
pin11 HFLB replace 7701
IF cable
check 7301
Ok replace 7301
pin5 CLBL
No
check 7501
pin16
3Back Forward4
Repair flow chart 105B2 CM23 GSIII 45
9 Go to cover page
C. Horizontal deflection
output repair flow :
1. Sympton :
check Hsync check Hsync check Hsync
without
7606 base 7605 gate 7501 pin8
H-deflection.
check check Hsync
check Hsync
replace 5611 Ok 7623 drain Ok 7621/ 7622 Ok
7501 pin6
180V emitter/collector
N N N
check short circuit check refer 7501
5611 pin4 6631,7621,7622 check list
2. Sympton : check check 7503
check 2629 refer 7503
East /West N 7610/7611/7612 N pin11 N
parabola exist check list
corr. fail parabola exist parabola exist
3. Sympton : Enter factory mode
check check
H-linearity check linearity data
5608 / 7614 7617/7619
(full freq.range) in the eeprom
check
refer 7801check list
1602
4. Sympton : check check refer 7801check list
H_dc shift 1602 / 3644 6634 / 6635 Q1 / Q2 / Q3
3Back Forward4
46 105B2 CM23 GSIII Repair Flow Chart
9 Go to cover page
basic check
D. Vertical Deflection Failure +12 /-12V /
+60V ( C2516 )
Sympton : check replace
one horizontal line 3410,3403 N 3410,3403,3407,
V_size is too large / too small 3407,3405 3405,7401
check
6403
check 7401 check
Ok
pin2,pin3 ramp 3411,3412
No
check
7501
3Back Forward4
Repair flow chart 105B2 CM23 GSIII 47
9 Go to cover page
check cpu
E. CPU
Basic Check B+ pin6=5V
check list
OSC.=12MHz
check pin 2
2. Tilt
pwm output from 0V to 5V
check pin 3
3. Abl-con
pwm output from 0V to 5V
check pin5 check
5. Reset
from low to hi 3816 / 2820
check pin13
check
13. H-unlock normal : low
3850 / 7809
H-unlock : hi
18 , 19 , 20 check
S-cap switch Q1,Q2,Q3
pin21(stby) pin28 (off)
check
21 , 28 normal hi hi
pin 21 / 28
stby , off standby low hi
7804 / 7805
off low low
check pin22
22. Key
check up , down , left , right, enter
3Back Forward4
48 105B2 CM23 GSIII Repair Flow Chart
9 Go to cover page
check pin24
1.no H/V sync & IF cable pin5 floating - free run mode
24. 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
idle status
25,26. DDC check
sda= pin25 = hi
sda,scl 7801
sc l= pin26 = hi
check
7806 24C08
idle status
30,31 IIC 7501 TDA4857
sda=pin30 = hi
sda, scl 7301 TDA4886
scl =pin31 = hi
7302 TDA 4822
7304 MTV018N
1 . Normal
Fhout=Fhin
check sync. Fvout=Fvin
Hs_in=pin 40 2. Self test
40,41,34,33
Vs_in=pin 41 Fhout=46.875Khz
Hs_in,Vs_in,Hs_out,Vs_out
Hs_out=pin 34 Fvout=75Hz
Vs_out=pin 33 3. sync out of rang
Fhin> 70KHz
Fvin>168Hz
3Back Forward4
Repair flow chart 105B2 CM23 GSIII 49
9 Go to cover page
Basic check
F. TDA4857 Vcc =pin9=pin10=12V
Vcc > 9V
Check List gnd =pin7=pin25=0V
during startup
pin16 / 17
1. HFLB
if no exist CLBL=hi
( from H.defl )
HUNLOCK = 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 compare the level with pin 4
b. pin4 generate the saw_tooth wave inhibit pin6 output
3.4.5.6 B+ control
c. pin5 controlled output duty if pin3 is low
d. pin6 pwm output to control B+
to H_deflection.
8. HDRV
7605 base
to H-deflection east/west control
11.EWDRV
7612 base
differential input
12,13 Vout1/Vout2
to 7401 pin 2, 3
V & H sync input from
14,15 Vsync,Hsync
7801 pin 33 , 34
pin16 is pulled up to high level at conditions
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
3Back Forward4
50 105B2 CM23 GSIII Repair Flow Chart
9 Go to cover page
pin 17 is pulled to high while PLL1( pin26 )
17. Hunlock
is not locked in searching mode
18. IIC sda = hi initial failure could be the following ICs
19 IIC scl = hi 7301,7302,7304,7801,7501
to 7501 pin30
20 asymmetry EW output
using for soft-start
compensate V_size
21 EHT_compen.
because of load variation
pin22 determin the AGC
22,23,24
50Hz< freq. <160Hz
VAGC,VREF,VCAP
pin23 & 24 determin the frequency
pin26 determin the pll1 loop filter
26,27,28,29
30K
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