PANASONIC TC26LX20 TC32LX20 TC22LR30 primary Power Supply Check
PRIMARY POWER SUPPLY CHECK
Is Standby Voltage at TP-7015 have [7V]? If not, check Fuse [F7001, F7002 & IC7005].
If OK, check AC_ON signal at TP7003 - {0.7V}. If not good, check the Power on the Switch On the 'K' board and the connection between [PK-1 & PAP-1] If OK, confirm the protect circuit on AP board is working. D824 should measure 7V. If OK, check the main controller IC1106 on the 'DG' board.
Check the voltage at TP7013 '14V'. if not good, repair the Sub-power circuit on the 'P' board.
If OK, check the [120V_ON_ACT] signal at Pin-14 of PP4. It should measure ~[0V]. If not good, check the voltage at Pin-43 on connector PAP-2 [~0V]. If not good, confirm IC1106 on Circuit board 'DG'. If Ok, confirm the DC-DC On/Off circuit on the 'AP' board is functioning well.
If there is [120V_On_ACT] signal, check the voltage at TP-7106 [15V]. If not good, repair or replace main Power Circuit or Main Power Board. If 'OK' make sure that Main Power 'P' board appears to be working properly.
Go to troubleshoot to Secondary power supply. 'P' board block diagram [TC-22LR30 Combo model]
P_Board [Primary & Standby Voltage Source block diagram] {TC-32LH_TC26 | 32LX20}
30V Tuner Power Supply Circuit.
Power Supply Troubleshooting Panasonic TC22LR30 TC-26LX20 TC32LX20 LCD TV
TROUBLESHOOTINGIf a problem occurs either in the unit or power supply a protection circuit is activated, and the unit shuts down. The power indicator on the front of the unit will flash red several times indicating an error code. Error code vary for different models.
LED FLASHES THREE TIMES
- Is the drive [12V] present on pin-4 of connector PAP7 of AP board? If NO, Check regulator IC805 on the AP board. If there is 12V;
- Is Sub [9V] present on pins 9&10 of connector PAP5 of AP board? If NO, check regulator IC809 on the AP board. If 9V is present;
- Is there [5V] present on pin-8 of Q804 of TP842 of AP board? If NO, check pin-2 of regulator IC808 or pins 6&8 of connector PAP2 of the AP board.