Panasonic PT-60LCX64-K Service Manual page 125

HOW TO DETERMINE IF THE DTV TUNER UNIT IS DEFECTIVE
NO PICTURE Picture is NOT displayed,
NO OSD Menu (OSD) is NOT displayed
Disconnect all connector cables on the TV/Tuner Unit, then take out the TV/Tuner Unit from the unit.
Or, place the TV/Tuner unit in Service Position (1).
Refer to DTV Tuner Unit Service Position, Figure A or B.
Connect the cable from the antenna or cable system to the ANTENNA (A) terminal of the DTV Tuner Unit.
Check the input voltage of the DTV Tuner Unit
at the following points on theTuner C.B.A.
(Use Pin 1 of P7007 as GND.)
P7007(Pin 3) : Approx. +30V
P7007(Pin 50~53, 58~61) : Approx. +10V
P7007(Pin 64) : Approx.+7.5V
OK
Is the voltage at Pin 17 of P7007 (RESET (L))
on the Tuner C.B.A. approx. +3.3V (High)?
OK
Is there serial data 0 at Pin 37 of P7007 on the
Tuner C.B.A. ?
OK
Is there serial data 1 at Pin 35 of P7007 on the
Tuner C.B.A. ?
NG
Replace the DTV Tuner Unit.
Check the voltage at the following points.
on the Tuner C.B.A.
NG
(Use Pin 5 of P7002 as GND.)
P7002(Pin 1) : Approx. +30V
P7002(Pin 2, 3) : Approx. +10V
Check the following parts on the Tuner
C.B.A.
IC7001, Q7001, Q7002, Q7003
Replace the defective parts if necessary.
NG
Is the voltage at Pin 3 of IC6003 on the
Main C.B.A. approx. +3.3V?
Check RESET(L) signal line between
Pin 3 of IC6003 on the Main C.B.A. and
Pin 17 of P7007 on the Tuner C.B.A.
NG
Is there serial data 0 at Pin 45 of IC6003
on the Main C.B.A. ?
WF106
Check the serial data 0 signal line
between Pin 45 of IC6003 on the Main
C.B.A. and Pin 37 of P7007 on the Tuner
C.B.A.
OK
Is there serial data 1 at Pin 46 of IC6003
on the Main C.B.A. ?
WF105
Check the serial data 1 signal line
between Pin 46 of IC6003 on the Main
C.B.A. and Pin 35 of P7007 on the Tuner
C.B.A.
125
The Digital Tuner Power
C.B.A. is defective.
NG
Refer to "CHECKING
THE DIGITAL TUNER
POWER C.B.A."
OK
NG Replace IC6003 on
the Main C.B.A.
OK
NG Replace IC6003 on
the Main C.B.A.
OK
OK Replace IC6003 on
the Main C.B.A.
NG
PT-60LCX64-K