I have carried out the tests to this set,
P7 = 1,2,3,4,5,6,7,8,10,11, all 0v with power lead in. 9=5.14v
p7 = 1,2,3,4,6,7,8,9,10,11. all 0v when power button pressed 5=5.22v
p7 = 1,2,3,4,5,6,7,8,10,11 all 0v with 5and 6 linked 9= 5,14v
p7 = 1,2,3,4,7,9,10,11. all 0v all 0v with power button pressed with 5 and 6 linked pin 8 goes to 3,18v for one second 5 and 6 go to 5.22v
p25 = 1,2,3,4,5,6,7,8,,10,11,12,13 all 0v and when power button pressed 9 goes to 5.22v
p25 = 3,4,7,8,10,12,13 all 0v 1,2, = 15.53v when linked to pin 5 p7 5 and 6 go to 4.98v power button pressed.
Relays click when p7 pins 5 and 6 are linked when power button pressed and also when pin 11 of p25 is linked to pi5 of p7
Also green led on SC and SS boards are on when these pins are linked and power button is pressed.
It is hard to tell which relays are clicking.
All these tests carried out with plugs removed from A board.
Do you have approx 200VDC at the SC and SS board power connectors? (Large 2/3 pin things)
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I'd continue on the A-board. The PANEL_MAIN_ON signal for example comes from IC9003. (the other signal going to P7 pin 6 comes from IC1100 on the A-board)
Both these ICs need a 3.3V power supply.
Can you measure the two points marked in the attached schematic?
After the diode it should read around 4.6V and the other one 3.3V.
Paul
I am looking on this board and non of the resisters are marked up only IC's and Q's i have even looked in the schematics i down loaded from Tom's site on Aboard lay out.i am attaching pictures of both sides of the Aboard for you to see ?
This is common on Panasonic boards due to the high density of components - the service manual will have a sheet indicating the locations of parts on the board.
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The "TC"s are US/Canada models, maybe worth trying Elektrotanya for an exact "TX" European model (with -B suffix for British model.)
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
Try the one I posted (and used here all the time :-) ) and just verify if the mainboard connectors and IC descriptions match. I don't think there should be that many differences.
It's probably mainly related to AC input voltage (PSU) and color systems...
We want to know why the microcontrollers don't send the signals to turn on the rest of the TV.
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