Pioneer Plasma Model# PDP-5070PU main board bad?

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

this is killing me anyone have any ideas? it keeps going back into lock mode and if everything is connected and i try to reset it then a red led comes on on both the power supply and the main board but shuts the power led and standby led off. but if i disconnect the hd digital assy. and try to reset it then only the red led on the main board comes on and it doesn't take it out of lock mode. any help?

[tom66]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

The only thing I can think is you've not connected something or perhaps ESD (electrostatic discharge) has caused a failure of the main board?

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

so your saying to take all the boards out of it and take it it to my buddies house in the woods and do this to it? or do u think it is fixable? i disconnected and reconnected the connectors about 15 times and made sure each time everything was connected and in the right spot.

[tom66]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

I don't know; sorry.

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

thanks for trying to help anyways.

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

i took the board out and started testing some things but i need some help. i tested 4 n-channel mosfets on the board 2 of them were k3911 and 2 were k2698 here is what i got i don't know if i am doing it correctly i see a million different ways people check mosfets but this is the way i did it maybe i am wrong but i am trying to figure out if they are good or bad i think 1 might be bad but here are the readings.in diode mode
k3911 readings
-lead +lead
g-d OL both
g-s 1530 both
d-s 474 both

+lead -lead
g-d OL both
g-s 1690 both
d-s OL both

k2698 readings

-lead +lead
g-d OL both
g-s 780 both
d-s 510 both

+lead -lead
g-d OL for 1 mosfet and other reads 760 and climbs up
g-s OL both
d-s OL both

the 1 that climbs up is the 1 i am guessing is bad and they were all tested in circuit. should i take the 1 that climbs up out of the board and recheck? or do they all need to be taken out? all help appreciated

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

when i checked the bottom of the board it looks like str-f6167 got hot which is a switching regulator but i don't know how to check it to see if it is bad. and i can't find a cross reference for it. no one in the US even sells them that i saw.

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

can someone tell me what on the power supply sends the voltage to the vsus and vadr connectors? i don't have any power to those connectors but i do have power to every other connector on the board.

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

i am only getting 180v across the 450v caps but i don't know why? can someone help me out?

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

if i'm getting the correct voltage there then why am i not getting the 60v at the vsus and vadr connectors?

[tom66]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

That will be caused by the PFC circuit not working. Which can be caused by a number of factors, one of them is the main board not telling PFC to turn on, the other is a fault on the PFC circuit.

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

well how can i tell what all is on that circuit so i can narrow it down? or how would i be able to tell if the main board is sending the signal to turn it on?

[tom66]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

A signal such as POWER ON, PS ON, ON/OFF... from main board to power board.

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

there isn't any of those from the connector going to the main board from the power supply. i can name all of them on the board that go to the main board but they aren't labeled like that or even close. all the voltages from the power board to the main board and vice versa are all the marked voltages they are suppose to be so then i am guessing it is sending the signal.

[tom66]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

Is there a pin diagram in the service manual?

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?



yes on page 68 p8 and p9 connect to the main board if that is what you mean

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

is that what you meant?

[tom66]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

M_SW_DET, U_SW and AC_DET, what do you get, DC volts?

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

M_SW_DET 3.16v
AC_DET 2.91v
U_SW 2.17

[philliesfan30m]

Re: Pioneer Plasma Model# PDP-5070PU main board bad?

the 3rd pin on that connector says N.C. (relay) what does the n.c. stand for and what does it do? that one i don't have any reading on but it says i should have about 3.5v. is that a problem?