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

[philliesfan30m]

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

ok i tried to reset the trap switch by entering service mode but i can't get to the screen to fix it so i checked it after i tried to enter the service mode and it read 60volts until it shut the glow on the screen off and the relay click and put the red light on the main board once it shut down then the voltage dropped drastically

[philliesfan30m]

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

it is stable at about .9volts but it should be 60volts. it is at 60 volts then the relay clicks and turns a red light on the main board and the voltages drops down to about .9 volts like it is discharging. i get the same voltage at the power supply board as i do at the x and y boards. it seems like it keeps sending it back into lock mode but i can't figure out what is causing it. if i try to enter service mode it will attempt to but then after 10 seconds the relay clicks and puts a red light on the main board on and then i have to try to enter service mode again before it tries to do anything the power on and standby light are both on and get it to reset or find out what is causing it to fault. i'm guessing it might have something to do with a relay or the vadr but the vadr has voltage there until it "trips" the red light on the main board.

[tom66]

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

It just sounds like the PSU is shutting down, so I'd look at the PS ON signal from the main board. If it is shutting down check the flowcharts (if any) in service manual for seeing why the main board might be shutting down. Try unplugging everything unnecessary: audio amplifier (if external), speakers, button board, IR board (if power button on separate board.)

[philliesfan30m]

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

from the chart it says replace power supply unit. because i only have 174 volts and it says it should be no lower than 340v if so it is bad because it should read 390v. so where do i go from here and is there a fix other than replacing the whole unit or can i troubleshoot and find the exact culprit? thanks for being the only 1 that has offered help!

[tom66]

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

Hmm, does the 174V ever jump up to 390V, or is it always low? Sounds like PFC problem, usually not too hard to repair.
340V is for 240V country. 165~175V is for 120V country.

[philliesfan30m]

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

i also checked the ps_pd and that wasn't getting any voltage and it's suppose to be between 0 and 3.3v i didn't get anything when unplugging and plugging the tv.i also checked that N.C. (relay) and that is suppose to read 3.35v and that reads 0 except when i plugged the tv in then i got .01v. i would just like to replace what is wrong and not the whole thing if i can find out the exact problem and where to start. i'm not the best at reading schematics but i try.

[philliesfan30m]

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

no it stays right there at 174 thats what i get when i checked the cathode of d204 and negative of rc101 like it said in flowchart. where do i go from here?

[tom66]

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

Can you show me the general area you are testing? D204 may be shorted, PFC IC may be bad, PFC Vcc cap may be bad. Any schematic for power board?

[philliesfan30m]

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

does this help? page 64 i couldn't just save that page to post it sorry

[tom66]

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

That's just a block diagram ,not a schematic unfortunately.

[philliesfan30m]

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

i've been looking i can't find a schematic for the power supply

[philliesfan30m]

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

still can't find a schematic! i checked d204 and it is ok. anything else to try and check? which are the pfc ic and pfc vcc caps?

[tom66]

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

Can you provide the picture I asked for?

[philliesfan30m]

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

of the area of the board where i checked d204 and rc101? yeah give me a few minutes. i took the board out and check a bunch of diode on the board. all diodes are suppose to read only 1 way correct? if so i found 3 that read both ways and checked them several times. do you think that would be the problem or just part of the problem? or are they ok?
d301 read 22 d307 read 167 d372 read 500 cathode to neg. and anode to pos.
d301 read 22 d307 read 1769 d372 read 1700 cathode to pos. and anode to neg.
in diode mode on dmm

[tom66]

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

Please provide a picture as I don't know how those diodes are being used.

[philliesfan30m]

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

sorry my camera isn't the best thats why i took so many pics because i didn't know how they came out or if you could see everything clearly.

[philliesfan30m]

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

in the 2nd pic rc101 is on the heatsink and in the 3rd pic d204 is to the right of the transformer partially hidden.in the last pic d372 is in front of the smaller heatsink closest to the connectors and d301 and d307 is in between the 2 longer heatsinks to the right of the transformer if that helps any

[tom66]

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

Try setting camera to macro and taking the power board out in sunlight. Can you highlight the area around which you're testing?

[philliesfan30m]

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

the sun isn't out yet. lol

[philliesfan30m]

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

this any better?