Check for short-circuit of the following points on the
Main P.C.B. with the tester.
- TP1102 - GND [REG9V]
- TP1105 - GND [STBY_7V]
- TP1106 - GND [STB3.3V]
- TP1108 - GND [STB5V]
- TP1109 - GND [SUB1.8V]
- TP1111 - GND [SUB3.3V]
- TP1113 - GND [SUB1.2V]
- TP1116 - GND [SUB5V]
- TP2007 - GND [15.5V]
- Pin 1 of CN1101 - GND [SOUN18V]
- Pin 6 of CN1101 - GND [AC_STOP]
- Pin 7 of CN1101 - GND [REG_30V]
- Pin 8 of CN1101 - GND [TV_SUB_ON]
- Pin 9 of CN1101 - GND [LCD_17V]
Replace any defective parts on the Main P.C.B., etc.
Check the following parts on the Main P.C.B. with the tester.
- IC1103 (Pin 1) or TP1102 - TP1113
- IC1104 (Pin 1) or TP1102 - TP1111
- IC1105 (Pin 1 - Pin 2) or TP1102 - TP1109
- IC1106 (Pin 4 - Pin 5) or TP1105 - TP1108
- IC1107 (Pin 1 - Pin 2) or TP1102 - TP1116
- IC1108 (Pin 1 - Pin 5)
Replace any defective parts.
Check the voltage at the following points on the Main P.C.B.
- TP1102 - GND: Approx. +9 V [REG9V]
- TP1105 - GND: Approx. +9.5 V [STBY_7V]
- TP1106 - GND: Approx. +3.3 V [STB3.3V]
- TP1108 - GND: Approx. +5 V [STB5V]
- TP1109 - GND: Approx. +1.8 V [SUB1.8V]
- TP1111 - GND: Approx. +3.3 V [SUB3.3V]
- TP1113 - GND: Approx. +1.2 V [SUB1.2V]
- TP1116 - GND: Approx. +5 V [SUB5V]
- TP2007 - GND Approx. +15.5V[15.5V]
- Pin 1 of CN1101 - GND: Approx. +19 V [SOUN18V]
- Pin 7 of CN1101 - GND: Approx. +30 V [REG_30V]
- Pin 9 of CN1101 - GND: Approx. +17 V [LCD_17V]
CHECKING THE OPT/TV UNIT (MAIN P.C.B.)
Take out the OPT/TV Unit without the Connectors CN3502, CN4501, CN5503 and CN8201 connected.
Then, remove the Main PCB Shield Case Top.
Plug in the AC Cord and turn the power ON.
OK
There is no problem with the Main P.C.B.
Check the other P.C.B.s and replace any defective parts.
NG
Check the other parts on the Main P.C.B. and replace
any defective parts.
Refer to OPT/TV Unit (Main P.C.B.) Service Position, Figure 2.
PT-56LCX70 / PT-61LCX70 / PT-50LCX7 / PT-56LCX7 / PT-61LCX7
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