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PT-50LCZ70 / PT-56LCZ70 / PT-61LCZ70 / PT-50LCZ7 / PT-56LCZ7 / PT-61LCZ7
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
- TP1201 - GND
- TP1203 - GND
- TP1205 - GND
- Pin 1 of CN1101 - GND
- Pin 6 of CN1101 - GND
- Pin 7 of CN1101 - GND
- Pin 8 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) (See Note 2)
- IC1201 (Pin 1) or TP1102 - TP1203 (See Note 1)
- IC1202 (Pin 1) or TP1102 - TP1201 (See Note 1)
- IC1203 (Pin 1 - Pin 2) or TP1102 - TP1205 (See Note 1)
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:
- TP1201 - GND
- TP1203 - GND
- TP1205 - GND
- Pin 1 of CN1101 - GND: Approx. +19 V [SOUN18V]
- Pin 7 of CN1101 - GND: Approx. +30 V [REG_30V]
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]
[DDR3.3V] (See Note 1)
[FHD1.2V] (See Note 1)
[FHD3.3V] (See Note 1)
[SOUN18V]
[AC_STOP]
[REG_30V]
[TV_SUB_ON]
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. +3.3 V [DDR3.3V] (See Note 1)
Approx. +1.2 V [FHD1.2V] (See Note 1)
Approx. +3.3 V [FHD3.3V] (See Note 1)
OK
Note:
1. When checking TP1201, TP1203, TP1205, IC1201,
IC1202 or IC1203 on the Main P.C.B., it is necessary
to remove the Drive P.C.B.
2. IC1108 is on the foil side of the Main P.C.B.
NG
Check the other parts on the Main P.C.B. and replace
any defective parts.
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