Secondary Power Supply Check - Panasonic TC-26LX20 Technical Manual

Confirm that the P board is good.
Confirm the voltage at R870 and R873. (3V)
1) Confirm the power control signals from IC1106.
MAIN_ON: (H) 2.4V, (L) 0V: Pin 39 of PAP2
SUB_ON : (H) 2.4V, (L) 0V: Pin 38 of PAP2
PANEL_O N: (H
PAP2
2 ) Confirm the power control signals from IC7
P_ON_H: (H) 5V, (L) 0V Pin 15 of P
DR_P_ONH: (H) 5V, (L) 0V: Pin 16
PAP6
C onfirm the power control signals to each
MAIN_ACT:
SUB_ACT:
PANEL_ACT:
DR_P_ON _AC
P_ON_ACT:
Confirm the output voltage from
each regulator IC.
There is no problem in Circuit Board AP

Secondary Power Supply Check

OK
OK
) 2.4V, (L) 0V: Pin 23 of
50
AP6
of
OK
regula
(H) 2.4V, (L) 0V
(H) 2.4V, (L) 0V
(H) 2.4V, (L) 0V
T: (H) 2.4V, (L) 0V
(H) 2.4V, (L) 0V
OK
OK
NG
Check the R858, 860,
870, 871, 872, 859,
861,873, 874, 899, D841
NG Check the IC1106 on
Circuit Board DG and
IC7501 on Circuit Board
1.
C heck the each Diode and Tran
tor.
MAIN_ACT: D830, D85
SUB_ACT: D832, D857
NG
PANEL_ACT: D835, D858
DR_P_ON_ACT: D834, D860,
Q828
P_ON_ACT: D831, D859, Q827
NG
Replace the Regulator
45
and D842.
RD.
sistor.
6
IC.