VeiwSonic VA912b

[Spacedye69]

Flashing green light. No picture. All the caps were CapXon.
The three bulging caps were 470uf 25v reading between 3 and 7 ohms esr. The big 100uf 400v cap had a slight bulge but was open.

Cap list
KF series: mfr spec qty
470uf 25v 10mm x 16mm ripple=1200 imp= .076 5
470uf 10v 8mm x 12mm ripple=580 imp= .25 1

KM series:
100uf 400v 18mm x 35.5mm ripple=550

I replaced the KF series with Nichicon PW, same sizes and spec.
The KM series I used a Nichicon PB that was 18mm x 40mm.

There was a small cap that looked like a 22uf 25v that was covered in glue that I left in.

[Krankshaft]

Re: VeiwSonic VA912b

Wow thats a beefy HV transformer.

Does it have both inverter circuits in one package?

[arneson]

Re: VeiwSonic VA912b

Good observation.
It seems the better or more efficiant the transformer the smaller the mosfets are.
The last two inverter modules I bought yesterday have no discrete components and drive six lamps.
https://cdn.badcaps-static.com/pdfs/...895fd1b84c.pdf
These fail also, I have a collection of dead ones.

[aoyb]

Re: VeiwSonic VA912b

Hello ... I'm new to caps...
Well I started wiring a junk va912b ....
It does not look like the one above..
with a power supply from a NEC LCD19WV power supply...
YA it's a good one... I Found the problem with that one too late... ripped wire ... I'll make it fit..
All I need to finish is the pin outs for CN1 Plug to power the main dvi/vga board.
on the Viewsonic VA912b.

I'm also gonna wire the board to the pc power supply.