Samsung LT-P227W 06 Troubleshooting
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
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
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
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
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
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
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