NEC Px42VM3A lost all display

[Dblueman]

Re: NEC Px42VM3A lost all display

Model NP42B2MF02
20220455
4.7-5, 25/50-65/160-175
3.0/2.0/1.6A Factory ID:K
NEC CORP Made in Japan

[tom66]

Re: NEC Px42VM3A lost all display

Top of this pic. White, blue cable.

https://www.badcaps.net/forum/attach...4&d=1358192926

[Dblueman]

Re: NEC Px42VM3A lost all display

is that the one you wanted?
I'll write this again if that's okay
Model NP42B2MF02
20220455
4.7-5,25/50-65/160-175
3.0/2.0/1.6A Factory ID : K
NEC CORP made in Japan

[tom66]

Re: NEC Px42VM3A lost all display

I don't know what that is but it has nothing to do with CN7.

[Dblueman]

Re: NEC Px42VM3A lost all display

The only other label is on the board itself near CN7
PKG42B2G1
GP2101305
01C
I've looked under this board and there's no label under it.

[tom66]

Re: NEC Px42VM3A lost all display

I can see, right next to CN7, there is a line going over to a box with labels. What are these labels?

[Dblueman]

Re: NEC Px42VM3A lost all display

if you mean the 2 labels to the left of CN7 one is a serial # and the other is that info that I posted. I can give you the info thats on the right towards the middle but it's not a label

[tom66]

Re: NEC Px42VM3A lost all display

I mean this one.

[Dblueman]

Re: NEC Px42VM3A lost all display

the other one I mentioned is a label to the left of the main power supply and it's just telling the input voltage and out put voltage

[Dblueman]

Re: NEC Px42VM3A lost all display

I got ya
TP10 TP9
TP8 TP11
TP19 TP22
TP23 TP24

[tom66]

Re: NEC Px42VM3A lost all display

Huh, I had hoped for Vd etc.
Time for bed for me, will have a look in the morn.

[Dblueman]

Re: NEC Px42VM3A lost all display

Okay sounds great! Iam learning alot. And am greatful. all the best to you and yours.

[Dblueman]

Re: NEC Px42VM3A lost all display

thought I would add some more photos.
These are the bottom side of the circuit board # NEC 942- 200432.
as you can see this circuit board has gotten pretty warm. this is on the right side when unit is lying face down, This circuit board is connected to PH cable connection. This circuit board is found underneath the main input circuit board.

[tom66]

Re: NEC Px42VM3A lost all display

Do you see those cyan-blue capacitors with a "K" shape on top?
What voltage do you measure across them?

[Dblueman]

Re: NEC Px42VM3A lost all display

Good Morning,
Are these the ones you speak of ? just below CN7 see the pictures I included
These are labeled as C62,C63,C64,C65. Circuit board # 942 200 450
Do I need to remove the caps from the board to get measurment?

[tom66]

Re: NEC Px42VM3A lost all display

Yep those.
Measure them in circuit...

[Dblueman]

Re: NEC Px42VM3A lost all display

Should I use a cap meter or ohm meter and do I need power running to them? If I need power running I'll put it all back together or
Should I take the circuit board out. I only ask because it's a process to measure those from the bottom of the board.
Can I measure them by putting the + lead on top of the cap and the - lead to cassis?
What do you recomend?

[tom66]

Re: NEC Px42VM3A lost all display

Measure volts DC across them while the set is running.
The leads on either side can be probed, no need to remove it.

[Dblueman]

Re: NEC Px42VM3A lost all display

From left to right
C65 00.7
C64 00.7
C63 00.7
C62 00.7 This was set on 200 DCV

[tom66]

Re: NEC Px42VM3A lost all display

OK; this indicates a lack of Vda. Which will cause no picture.

Can you isolate all but the one long board going along the bottom of the panel. This means disconnecting all connectors. Leave the heatsinks on.