Repair Flow Chart: Trouble Condition
page 3
Green Power LED and LCD backlights are on,
but no video or OSD.
(TABLE *1) Main Bd.: 12V & 24V Test Points
or
or
or
or
(TABLE *2) Main Bd.: "T-CON Power supply" Test Points
or
or
(TABLE *3) Main Bd.: "LVDS Clock" Test Points
US1K 42", 46"
Main K8B "8pin"
Model
24V on Main Bd.
Model
12V on Main Bd.
US1J 26", 32"
Main K8B "8pin"
Main L1604
US1J 26", 32"
US1J 26", 32"
Main K5LV "29pin"
Main RB6301
Model
Power ON/OFF SW on Main Bd.
US1K 42", 46"
Main K8B "12pin"
Main L1613
Main L1712
Main K8B "12pin"
Confirmation Voltage
12 V
12 V
Confirmation Voltage
24 V
Main L1604
42"(00 ver) = 24V, 42"(01 ver) = 15V, 46" = 16V
Confirmation Voltage
12 V
12 V
Model
LVDS Clock on Main Bd.
Confirmation Voltage
US1K 42", 46"
Main K5LVDS "36pin"
Main L6309
US1J 26", 32"
Main K5LV "29pin"
About 70MHz Clock
US1K 42", 46"
Main K5LVDS "12pin"
About 70MHz Clock
no: 0V
Replace "
Power Bd
."
and "
Wire harness
".
yes
LCD Backlights are ON.
But, TV has no video or OSD.
no: 0V
yes
yes
Main Bd. is not working.
Replace "
Main
Bd
."
Main Bd. is not working.
Replace "
Main Bd.
"
T. Cnt. Bd.
or
LCD Panel
is not working.
1st: Replace "
T. Cnt. Bd.
&
LVDS Cable
".
If T. Cnt. Bd. & LVDS Cable does not
correct problem, then:
2nd: Replace "
LCD Panel
"
Is power to T-CON supllied
from Main Bd.?
(see TABLE*2)
Is LVDS Clock outputed?
(see TABLE*3)
Confirm LVDS cable connection.
And check for video/OSD again.
no: 0V or 1.1V constant
On Main Bd.:
Are the 12V and 24V supplied
from Pwer Bd.?
(see TABLE*1)
Summary of Contents for DP26649 - 26" LCD TV
Page 29: ... 24 IC BLOCK DIAGRAMS IC001 Audio AMP ...
Page 30: ... 25 IC1670 Voltage Regulator IC803 EEPROM IC BLOCK DIAGRAMS CONT ...
Page 31: ... 26 IC1680 DC to DC Regulator IC1600 DC to DC Converter ...
Page 32: ... 27 IC5500 Video Processing IC BLOCK DIAGRAMS CONT ...
Page 33: ... 28 IC6600 USB protection IC6270 Low output Amplifier ...
Page 34: ... 29 IC5700 DDR Double Data Rate SDRAM IC BLOCK DIAGRAMS CONT ...
