NEC Px42VM3A lost all display

[Dblueman]

Re: NEC Px42VM3A lost all display

I assume the heat sinks are the brown looking like film ribbons.
Do I need to disconect the white ribbons as well. All connectors thur out the unit
Basically if a circuit board is connected with a white plug type clip disconnect it correct.

[tom66]

Re: NEC Px42VM3A lost all display

It appears the heatsinks for the bottom drivers is the metal plate at the bottom of the TV - runs the length of the boards. Leave the brown connectors in & whatever you do, do not remove this heatsink if the brown connectors are still connected.

[Dblueman]

Re: NEC Px42VM3A lost all display

Okay I put the heat sink bar back in and all brown ribbons all still in place.

[tom66]

Re: NEC Px42VM3A lost all display

OK, so if you detach all but one of those long boards (aside from brown conn) what do you measure? I am trying to rule out the plasma panel itself as being at fault.

[Dblueman]

Re: NEC Px42VM3A lost all display

where do you want me to measure from? on the same caps?

[tom66]

Re: NEC Px42VM3A lost all display

Yes.

[Dblueman]

Re: NEC Px42VM3A lost all display

from left to right 00.2 00.0 0.00 00.2 each time you check a cap it makes a click sound.

[tom66]

Re: NEC Px42VM3A lost all display

Are you using Volts DC? It is sounding like the plasma panel is shorted, which is not good...

[Dblueman]

Re: NEC Px42VM3A lost all display

Now all of them are reading 00.3 on DCV 200

[tom66]

Re: NEC Px42VM3A lost all display

This is with TV turned on? You get that 170V as before?

[Dblueman]

Re: NEC Px42VM3A lost all display

yes,I did turn on the unit. what I did was I have both left and right boards PD and PH still pluged in and nothing else. Should I disconect PH?

[Dblueman]

Re: NEC Px42VM3A lost all display

PD is the circuit board whichis on the left and has CN7 on it. which is connected to the 4 caps
PH is the circuit board which is on the right side of the unit .

[tom66]

Re: NEC Px42VM3A lost all display

Yes, plug in the boards. TV -MUST- be off while doing this or plasma panel could fry.

[Dblueman]

Re: NEC Px42VM3A lost all display

all of them with the unit OFF read 0.00

[tom66]

Re: NEC Px42VM3A lost all display

Sorry, what I meant is the TV should be off while disconnecting or reconnecting, but you need to test while it's on.

[Dblueman]

Re: NEC Px42VM3A lost all display

okay I understand. With the unit on those caps read 00.2 on DCv at 200

[tom66]

Re: NEC Px42VM3A lost all display

All brown connectors unplugged?

[Dblueman]

Re: NEC Px42VM3A lost all display

not sure what you mean by brown connectors. Any plug in type connectors I have are all white. PD and PH have brown wires with white plug connectors are the brown connectors the ones that have the ribbons plugged in them?

[Dblueman]

Re: NEC Px42VM3A lost all display

with all the ribbons disconected with the exception of the one ribbon going from CN7 to CN8 which has the 4 caps on the circuit board and only the two circuit boards connected PD and PH The caps read 00.1 on DCv 200

[tom66]

Re: NEC Px42VM3A lost all display

OK, so PSU is not working right. That's good, something which can be fixed.
Is there any Va label on PSU itself? Near 170V output? It may be generated separately...