NEC Px42VM3A lost all display

[Dblueman]

Re: NEC Px42VM3A lost all display

input ac 100-240v 50Hz/60Hz
Out put +170v 1.6A+60v 1.6A +5v 4.0A+5v 0.8A+3.3V 1.8A
+7v 0.5A+13v 1.0A
+24v 1.25A + 6v0 15A
Made in Japan

[Dblueman]

Re: NEC Px42VM3A lost all display

is this what you need
Input AC 100 -240v 50Hz/60Hz
Output + 170V 1.6A +60V 1.6A+ 5V 4.0A+5V 0.8A+3.3V 1.8A + 7V 0.5A+13V 1.0A +24V 1.25A + 6V0 15A
made in Japan

[tom66]

Re: NEC Px42VM3A lost all display

170V is the nominal output of the PSU. We're looking for the panel's calibration sticker. Like this:
https://www.badcaps.net/forum/attach...9&d=1326915294

because each plasma panel is slightly different and the voltage settings must be set properly to ensure a good picture.

[Dblueman]

Re: NEC Px42VM3A lost all display

Could it be this?
NEC NP42 B2MF02
202204255
4.75-5.25/50-60/160-175
3.0/2.0/1.6A Factory Id:K
Made in Japan

[Dblueman]

Re: NEC Px42VM3A lost all display

Thanks for being patient with me tom66

[Dblueman]

Re: NEC Px42VM3A lost all display

I don't see any other labels. I've removed all the circuit boards and looked under them
Those two were the only ones I found

[tom66]

Re: NEC Px42VM3A lost all display

Hmm well normally there'd be a calibration sticker present. Can you measure the Vs voltage and tell us what you get?

[Dblueman]

Re: NEC Px42VM3A lost all display

how would I do that?

[Dblueman]

Re: NEC Px42VM3A lost all display

What I mean to say is would I use a standard volt/ohm meter and where on the power circuit board would I test to give you a reading.

[tom66]

Re: NEC Px42VM3A lost all display

It'd be on the power supply connectors going to the X and Y-drive. Can you post a close-up shot of that connector, on the power supply end?

[Dblueman]

Re: NEC Px42VM3A lost all display

I see the L and N but where would the X and Y be and what seting on the ohm meter do you need?

[tom66]

Re: NEC Px42VM3A lost all display

X and Y boards are on the right & left hand side of the plasma panel... It's those brown/white wires. Top of this pic.

https://www.badcaps.net/forum/attach...9&d=1358192926

[Dblueman]

Re: NEC Px42VM3A lost all display

is this what you need

[Dblueman]

Re: NEC Px42VM3A lost all display

try these, I see what you are asking

[tom66]

Re: NEC Px42VM3A lost all display

3rd pic. Any labels next to the connectors?

[Dblueman]

Re: NEC Px42VM3A lost all display

on the cables themselves they are marked PD and PH there is a small label with this marking on it.
Serial NO
202204255
Vd= 60v
Vs= 170.8v
Code AA-01

[tom66]

Re: NEC Px42VM3A lost all display

OK, so you will have to test each pin, red pin on the metal surround around the connector pin, black probe on the chassis of TV, measure on 200V DC range.

[Dblueman]

Re: NEC Px42VM3A lost all display

PH from left to right
pin 1 00.8
pin 2 00.7
pin3 - 00.0
pin4 00.6
pin5 -00.0
pin 6 -00.0
pin7 00.0
pin8 -0.00
pin9 -0.00

PD from left to right
pin1 171.9
pin2 171.9
pin3 -0.00
pin4 00.0
pin5 -00.2
pin6 -00.3
pin7 04.8
pin8 -00.2
pin9 10.1

[tom66]

Re: NEC Px42VM3A lost all display

OK, so you have good Vs, but I don't see Vd. Vd goes to the vertical driver boards from the sustain boards, and it's generated on the PSU in most cases.

The plasma panel requires Vd to make the display work though you should still see a faint glow. It is possible it derives the other voltages for the sustain board from Vd instead of Vs.

CN7 is on one of the drivers. Next to it there is a label. What does this label show?

[Dblueman]

Re: NEC Px42VM3A lost all display

So far I've found everybody but CN7 where abouts?
I apologize I have to go up and down to the work shop