Viewsonic VX2235vw (DAC19M009) 0.1 second to black

[DevoDave]

Hi Guys,

I have a Viewsonic VX2235wm monitor with a DAC-19M009 inverter board.

It fires up for about 0.1 second, then shuts down. Seriously... it is almost too quick to see the picture. Power LED stays blue.

If I fire it up without the CCFL's in, and no real difference.

After getting the problem, I replaced all the caps and FETS from a kit (good quality caps), so all should be OK there. The problem remains unchanged.

Any clues?

[Rtech]

Re: Viewsonic VX2235vw (DAC19M009) 0.1 second to black

Measure the resistance of the Inverter transformer secondaries,is the nest step.

[DevoDave]

Re: Viewsonic VX2235vw (DAC19M009) 0.1 second to black

Measure the resistance of the Inverter transformer secondaries,is the nest step.

Each secondary is in the vicinity of 128K Ohm.

[Rtech]

Re: Viewsonic VX2235vw (DAC19M009) 0.1 second to black

Each secondary is in the vicinity of 128K Ohm.

!28 K Ohm is a measurement I am amazed at on an Inverter Transformer !!!!!Would expect 400-1100 ohms !!!!!!
Suggest you re-check

[PlainBill]

Re: Viewsonic VX2235vw (DAC19M009) 0.1 second to black

There are several possible causes, but the most likely is a broken CCFL or wire to a CCFL. Most inverter controllers can be configured to ignore fault conditions for a period of time by choosing the value of a cap. Commonly this delay time is two seconds, but it can be less.

Try it with only one CCFL hooked up at a time. Do you get a flash each time?

PlainBill

[DevoDave]

Re: Viewsonic VX2235vw (DAC19M009) 0.1 second to black

Sorted! It was the CCFL's.

I picked up a dead monitor off ebay and swapped my 'fixed' inverter board into it, and it fired up without a drama. (OK... slight drama... it had a vertical line stuck on white, and a bad scratch on the screen.)

Transferred parts left and right and ended up with a good working monitor.

(I have left over a logic board and a DAC-19M010 inverter board. Inverter board needs caps fixed, but I'm betting it will be fine. Anyone needing one or both? Shipping plus US$15 each)

Thanks everyone.