Dynex dx-22ld150a11 with 2 seconds to black.

[ceconomon]

Dynex dx-22ld150a11 with 2 seconds to black.

The flashlight test on the screen allows me to see faint images and the sound and DVD player are working.

From other posts, I suspect the issue with primary or secondary transformers, but I'll refer this to the experts.

Primary
1-3 0.0 ohm
1-5 0.L
1-6 0.L
1-7 0.L
1-8 0.L
1-9 0.L
1-10 0.L
1-12 0.L

Secondary
1-2 .986 ohm
1-3 0.L
1-4 0.L
1-5 0.L
1-6 0.L
1-7 0.L
1-8 0.L
1-9 0.L
1-10 0.L

Many thanks to all that reply in this forum. I was able to rescue a friend's Vizio just by reading the posts.

Carson

[budm]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

There are two secondary windings on the inverter transformer T302, pin 1-2, and 3-4

[ceconomon]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

T302
3-4 17.79-18.03

I measured this several times and the results varied each time.

Thank you.

[retiredcaps]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

See

http://www.lcdparts.net/TransformerD...ProductID=4010

for the pinouts. We want the resistance between S1-S2 and S3-S4. The two reading should be around 960 ohms.

[budm]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

Your meter is good with good batteries, I expect 3&4 to be in the same ballpark as 1&2.

[ceconomon]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

Fresh batteries in the meter. Those were some old batteries.

Here are the new readings

1-2 .983
3-4 17.96

Not much of a change. I can try another MM if there is some doubt about it. Would removing it from the board help at this point?

[retiredcaps]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

Here are the new readings

1-2 .983
3-4 17.96

The problem, we, the regulars, are having with the above is that there are no units and we can't see what you are doing.

Is that 17.96 ohms, kohms, Mohms?

If it is the latter two, that transformer is bad. If it is 17.96 ohms, then something weird is going on.

[budm]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

Good point retiredcaps.

As you can see pin 1 & 2 are connected to two connectors of the lamps, same setup is applied to pin 3 & 4 as well, so it looks like the winding on pin 3 & 4 is bad. To be sure, you may want to remove the transformer and inspect it more closely. So far I cannot find the pin out for this transformer yet.

[ceconomon]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

Sorry, that would be my ignorance for not putting in the units of the readings.

1-2 .983 kohms
3-4 17.96 kohms

So it appears the transformer is at fault. I'll remove the board for a visual inspection tomorrow night. Is the link I have below a suitable replacement?

http://www.ebay.com/itm/Transformer-...item35bbb44efb

[retiredcaps]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

Is the link I have below a suitable replacement?

http://www.ebay.com/itm/Transformer-...item35bbb44efb

That is the correct part although I can't vouch for the seller.

[ceconomon]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

I went with Lcdparts for the part. After all a cheap part most likely caused the problem in the first place.

You can see from the picture we know have a functional TV that my boys are using as a computer monitor.

Thank you retiredcaps and budm.

[retiredcaps]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

I went with Lcdparts for the part.

I think budm buys from them a lot. I use them as a reference for people so they can see where the secondary pins are.

Glad you got it working.

[budm]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

I am glad it was simple fix, good job.
LCDPARTS.NET is in San Francisco, close to where I am (I am 30 minutes north of SF).

[retiredcaps]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

I am glad it was simple fix, good job.

Simple? PlainBill, jetadm123, alexanna and I did a lot of work to narrow down the possibilities of 2 seconds to black which eventually I put into the guide.

It took me a long long time to understand how these things work.

After you solve a "hands on" one, yes it is simple.

@ceconomon BTW, thanks for the personalized thank you. It is the 3rd one where someone posted a picture of them using their repaired monitor.

[budm]

Re: Dynex dx-22ld150a11 with 2 seconds to black.

It is simple because it is just the transformer, not a bunch of surface mounted components that had to be replaced, or worst if he have to replace the lamps.