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PT-56LCX70 / PT-61LCX70 / PT-50LCX7 / PT-56LCX7 / PT-61LCX7
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.
Refer to OPT/TV Unit (Main P.C.B.) Service Position, Figure 2.
Check for short-circuit of the following points on the
Main P.C.B. with the tester.
- TP1102 - GND
- TP1105 - GND
- TP1106 - GND
- TP1108 - GND
- TP1109 - GND
- TP1111 - GND
- TP1113 - GND
- TP1116 - GND
- TP2007 - GND
- Pin 1 of CN1101 - GND
- Pin 6 of CN1101 - GND
- Pin 7 of CN1101 - GND
- Pin 8 of CN1101 - GND
- Pin 9 of CN1101 - GND
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.
Plug in the AC Cord and turn the power ON.
Check the voltage at the following points on the Main P.C.B.
- TP1102 - GND:
- TP1105 - GND:
- TP1106 - GND:
- TP1108 - GND:
- TP1109 - GND:
- TP1111 - GND:
- TP1113 - GND:
- TP1116 - GND:
- TP2007 - GND
- 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]
There is no problem with the Main P.C.B.
Check the other P.C.B.s and replace any defective parts.
[REG9V]
[STBY_7V]
[STB3.3V]
[STB5V]
[SUB1.8V]
[SUB3.3V]
[SUB1.2V]
[SUB5V]
[15.5V]
[SOUN18V]
[AC_STOP]
[REG_30V]
[TV_SUB_ON]
[LCD_17V]
Approx. +9 V
[REG9V]
Approx. +9.5 V [STBY_7V]
Approx. +3.3 V [STB3.3V]
Approx. +5 V
[STB5V]
Approx. +1.8 V [SUB1.8V]
Approx. +3.3 V [SUB3.3V]
Approx. +1.2 V [SUB1.2V]
Approx. +5 V
[SUB5V]
Approx. +15.5V[15.5V]
OK
NG
Check the other parts on the Main P.C.B. and replace
any defective parts.
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