Page 1
5 Troubleshooting
5-1 No Power
LAMP off, power indicator
LED red color?
Yes
Does proper DC 14V
appear at C605, C682, C686?
Yes
Does proper DC A3.3V,
A5V, A1.8V, D1.8V appear at
C684, C687,C645,C643?
Yes
Does proper DC 5V, 3.3V,
2.5V, 9V, DNI1.8V appear at
C609, C625, C635, C652, C654?
No
No
No
No
Check a connection a power cable.
(BH39-10339X)
Change a adaptor. (BN44-00109A)
Check a IC611,IC612,IC605.
Change a main PCB ass'y.
(BN94-00496X)
Check a IC902, IC601, IC603, IC604,
IC606, IC607. Change a main PCB
ass'y. (BN94-00496X)
Yes
Does proper DC 33V, SNI_3.3V,
+3.3V_MD, +2.5V_MD1,
+2.5V_MD2, 8V, 8V_3D , SNI_1.8V
appear at C613, C437, C463, C477,
C484, C664, C666, C453?
Yes
A power is supplied to set?
No
No
Check a IC602, FT403, FT406, FT407,
FT408, IC608, IC609, FT404.
Change a main PCB ass'y.
(BN94-00496X)
Check a other function.
(No picture part)
Replace a lcd panel.
(BN07-00125A, BN07-00114A)
LTP227W 5-1
Page 2
5 Troubleshooting
5-2 No Video (Analog PC Signal)
Power Indicator is off.
Lamp on, no video.
Yes
Check a PC source and check
the connection of DVI cable?
Yes
Does the signal appear at
1
#15, 19, 21 (R, G, B) of IC102
Yes
Does the digital data
2
appear at output of
RA101~RA104, RA106, RA107 ?
Yes
Does the digital data
3
appear at output of
RA555~RA559, RA561?
Yes
Does the digital data appear at
4
output of RA402~RA407?
No
No
No
No
No
Input a analog PC signal and
connected cable. (BN39-00310A)
Check IC102, PC cable. Change a PC
cable. Change a main PCB ass'y
(BN94-00496X).
Check a IC101 and IC107.
Change a main PCB ass'y
(BN94-00496X).
Check a IC565, IC105 and IC506.
Change a main PCB ass'y
(BN94-00496X).
Check a IC403.
Change a main PCB ass'y
(BN94-00496X).
Yes
Does the digital data appear at
5
output of FT501~FT503, FT505?
No
Check a IC503.
Change a main PCB ass'y
(BN94-00496X).
Yes
Check a LVDS cable?
Replace a lcd panel?
No
Please, Call to Samsung Co. LTD.
(BN07-00114A, BN07-00125A)
5-2 LTP227W
Page 3
WAVEFORMS
5 Troubleshooting
1
R,G,B Output Signal (#15,19,21) Of IC102
3
Output Digital Signal of IC565
2
R,G,B Output Signal Of IC101
4
Output Digital Signal of IC403
5
Digital Output Data of IC503
LTP227W 5-3
Page 4
5 Troubleshooting
5-3 No Video (Digital PC Signal)
Power Indicator is off.
Lamp on, no video.
Yes
Check a PC source and check
the connectionn of DVI cable?
Yes
Does the digital data appear
6
at FT302 ~FT305 (Data, Clk +/-)?
Yes
Does the digital data
7
appear at output of
RA308~RA311, RA313, RA314 ?
Yes
Does the digital data
3
appear at output of
RA555~RA559, RA561?
Yes
Does the digital data appear at
4
output of RA402~RA407?
No
No
No
No
No
Input a digital PC signal and
connected cable. (BN39-00126A)
Check a DVI cable . (BN39-00126A)
Check a IC301 and IC105.
Change a main PCB ass'y
(BN94-00496X).
Check a IC565, IC105 and IC506.
Change a main PCB ass'y
(BN94-00496X).
Check a IC403.
Change a main PCB ass'y
(BN94-00496X).
Yes
Does the digital data appear at
5
output of FT501~FT503, FT505 ?
No
Check a IC503.
Change a main PCB ass'y
(BN94-00496X).
Yes
Check a LVDS cable?
Replacea lcd panel?
No
Please, Call to Samsung Co. LTD.
(BN07-00114A, BN07-00125A)
5-4 LTP227W
Page 5
WAVEFORMS
5 Troubleshooting
3
Output Digital Signal of IC565
5
Digital Output Data of IC503
4
Output Digital Signal of IC403
6
Signal of DVI_RX 0~2 (Data)
6-1
Signal of DVI_RXC (CLK)
LTP227W 5-5
7
Digital Output Signal Of IC301
Page 6
5 Troubleshooting
5-4 No Picture (Tuner_CVBS)
Power Indicator is off.
Lamp on, no picure.
Yes
8
Dose the signal
appear at #1 of IC202?
Yes
Does the signal appear at
9
#72 (Y), #71 (C) of IC201?
Yes
Does the digital data
10
appear at output of
RA201, 202 (Y), RA203, 204 (C)?
Yes
Does the digital data
11
appear at output of
RA408, 409 (Y), RA416, 417(C)?
No
No
No
No
No
Connect the RF cable and
check RF signal. (AA39-00039A)
Check a B+ voltage (#9, #7 of Tuner) :
33V, 5V change a main PCB ass'y
(BN94-00496X).
Check a IC202 and IC303.
Change a main PCB ass'y
(BN94-00496X).
Check a IC201.
Change a main PCB ass'y
(BN94-00496X).
Check a IC405 and IC406.
Change a main PCB ass'y
(BN94-00496X).
Yes
Does the digital data
3
appear at output of
RA555~RA559, RA561?
Yes
Does the digital data appear at
4
output of RA402~RA407?
Yes
Does the digital data appear at
5
output of FT501~FT503, FT505 ?
Yes
Check a LVDS cable?
Replacea lcd panel?
(BN07-00114A, BN07-00125A)
No
No
No
No
Check a IC565, IC105 and IC506.
Change a main PCB ass'y
(BN94-00496X).
Check a IC403.
Change a main PCB ass'y
(BN94-00496X).
Check a IC503.
Change a main PCB ass'y
(BN94-00496X).
Please, Call to Samsung Co. LTD.
5-6 LTP227W
Page 7
WAVEFORMS
5 Troubleshooting
3
Output Digital Signal of IC565
5
Digital Output Data of IC503
4
Output Digital Signal of IC403
8
Tuner_CVBS Output Signal
LTP227W 5-7
Page 8
5 Troubleshooting
WAVEFORMS
9
Analog Signal (Y,C) to IC201
11
Digital Output Y,C_OUT (0:7) Data Of IC405
10
3230 Y,C_OUT (0:7) Data
5-8 LTP227W
Page 9
5-5 No Picture (Video_CVBS)
5 Troubleshooting
Power Indicator is off.
Lamp on, no picure.
Yes
8
Dose the signal
appear at #6 of IC202?
Yes
Does the signal appear at
9
#72 (Y), #71 (C) of IC201?
Yes
Does the digital data
10
appear at output of
RA201, 202 (Y), RA203, 204 (C)?
Yes
Does the digital data
11
appear at output of
RA408, 409 (Y), RA416, 417(C)?
No
No
No
No
No
Check a A/V cable and video signal.
(BN39-00057A)
Check a connection harness.
Change a A/V input jack ass'y
(BN96-00894A).
Check a IC202.
Change a main PCB ass'y
(BN94-00496X).
Check a IC201 and IC902.
Change a main PCB ass'y
(BN94-00496X).
Check a IC405 and IC406.
Change a main PCB ass'y
(BN94-00496X).
Yes
Does the digital data
3
appear at output of
RA555~RA559, RA561?
Yes
Does the digital data appear at
4
output of RA402~RA407?
Yes
Does the digital data appear at
5
output of FT501~FT503, FT505 ?
Yes
Check a LVDS cable?
Replacea lcd panel?
(BN07-00114A, BN07-00125A)
No
No
No
No
Check a IC565, IC105 and IC506.
Change a main PCB ass'y
(BN94-00496X).
Check a IC403.
Change a main PCB ass'y
(BN94-00496X).
Check a IC503.
Change a main PCB ass'y
(BN94-00496X).
Please, Call to Samsung Co. LTD.
LTP227W 5-9
Page 10
5 Troubleshooting
WAVEFORMS
3
Output Digital Signal of IC565
5
Digital Output Data of IC503
4
Output Digital Signal of IC403
8
Tuner_CVBS Output Signal
5-10 LTP227W
Page 11
WAVEFORMS
5 Troubleshooting
9
Analog Signal (Y,C) to IC201
11
Digital Output Y,C_OUT (0:7) Data Of IC405
10
3230 Y,C_OUT (0:7) Data
LTP227W 5-11
Page 12
5 Troubleshooting
5-6 No Picture (S-VIDEO_Y,C)
Power Indicator is off.
Lamp on, no picure.
Yes
No
Connect the s-video cable.
Operating a video player.
(BN39-00060A)
Dose the signal appear at
9
#8 (Y), #10 (C) of IC202?
Yes
Does the signal appear at
12
C335 (Y), C336 (C)?
Yes
Does the signal appear at
9
#72 (Y), #71 (C) of IC201?
Yes
Does the digital data
10
appear at output of
RA201, 202 (Y), RA203, 204 (C)?
Yes
Does the digital data
11
appear at output of
RA408, 409 (Y), RA416, 417 (C)?
No
No
No
No
No
Check a connection harness.
Change a A/V input jack ass'y
(BN96-00894A).
Check a IC202.
Change a main PCB ass'y
(BN94-00496X).
Check a IC303.
Change a main PCB ass'y
(BN94-00496X).
Check a IC201 and IC902.
Change a main PCB ass'y
(BN94-00496X).
Check a IC405 and IC406.
Change a main PCB ass'y
(BN94-00496X).
Yes
Does the digital data
3
appear at output of
RA555~RA559, RA561?
Yes
Does the digital data appear at
4
Output of RA402~RA407?
Yes
Does the digital data appear at
5
Output of FT501~FT503, FT505?
Yes
Check a LVDS cable?
Replacea lcd panel?
(BN07-00114A, BN07-00125A)
No
No
No
No
Check a IC565, IC105 and IC506.
Change a main PCB ass'y
(BN94-00496X).
Check a IC403.
Change a main PCB ass'y
(BN94-00496X).
Check a IC503.
Change a main PCB ass'y
(BN94-00496X).
Please, Call to Samsung Co. LTD.
5-12 LTP227W
Page 13
WAVEFORMS
5 Troubleshooting
3
Output Digital Signal of IC565
5
Digital Output Data of IC503
4
Output Digital Signal of IC403
9
Analog Signal (Y,C) to IC201
LTP227W 5-13
Page 14
5 Troubleshooting
WAVEFORMS
10
3230 Y,C_OUT (0:7) Data
12
SVHS_Y,C Input Signal to IC202
11
Digital Output Y,C_OUT (0:7) Data Of IC405
5-14 LTP227W
Page 15
5-7 No Picture (Component1, 2 : 480i, 480p, 720p, 1080i [Y, Pb, Pr])
5 Troubleshooting
Power Indicator is off.
Lamp on, no video.
Yes
Dose the signal appear at
output Pin (#19_Y, #15_Pb,
13
#21_Pr) of IC103 ?
Yes
Does the signal appear at
14
output #15_Pr, 19_Y,
21_Pb of IC102 ?
Yes
Does the digital data
2
appear at output of
RA101 ~RA104, RA106, RA107 ?
Yes
Does the digital data
3
appear at output of
RA555~RA559, RA561?
No
Connect the RCA cable.
Operating a DTV STB and DVD player.
(BN39-00279A)
No
Check a IC103 and IC902.
Change a main PCB ass'y
(BN94-00496X).
No
Check a IC102 .
Change a main PCB ass'y
(BN94-00496X).
No
Check a IC101 and IC107.
Change a main PCB ass'y
(BN94-00496X).
No
Check a IC565, IC105 and IC506.
Change a main PCB ass'y
(BN94-00496X).
Yes
Does the digital data appear at
4
output of RA402~RA407?
Yes
Does the digital data appear at
5
output of FT501~FT503, FT505 ?
Yes
Check a LVDS cable?
Replacea lcd panel?
(BN07-00114A, BN07-00125A)
No
No
No
Check a IC403.
Change a main PCB ass'y
(BN94-00496X).
Check a IC503.
Change a main PCB ass'y
(BN94-00496X).
Please, Call to Samsung Co. LTD.
LTP227W 5-15
Page 16
5 Troubleshooting
WAVEFORMS
2
R,G,B Output Signal Of IC101
4
Output Digital Signal of IC403
3
Output Digital Signal of IC565
5
Digital Output Data of IC503
13
Output Signal of IC103 (Y,Pb,Pr)
5-16 LTP227W
14
Input Signal (Y,Pb,Pr) to IC102
Page 17
5-8 No Sound
5 Troubleshooting
Picture is display, no sound.
Yes
Does the signal appear at
Pin 67 (Tuner Sound signal) and
Pin 47,48 (PC Sound) and
15
Pin 53, 54 (COMP1_L, R Sound) and
Pin 56, 57 (COMP2_L, R Sound) and
Pin 50, 51 (VCR) of IC703
(MSP3420G)?
Yes
Check the DC +8V, +9V, +5V
16
of IC703, IC701?
Yes
No
No
No
Connect a sound cable.
(BN39-00148A,BN39-00448A)
control a volume.
Check a connection harness and
headphone jack.
Change a A/V input jack ass'y
(BN96-00894A).
Check a IC601, IC606 and IC607.
Change a main PCB ass'y
(BN94-00496X).
Does the signal appear at
17
L701 ~L704 ?
Yes
Replace the speaker ass'y?
(BN96-00714A(L), BN96-00716(R))
No
Check a IC701.
Change a main PCB ass'y
(BN94-00496X).
LTP227W 5-17
Page 18
5 Troubleshooting
WAVEFORMS
15
The Signal are Inputed to IC703
17
Output WaveForm
16
DC +8V
5-18 LTP227W
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