Dynex lcd 2 sec to black issue

[audiofreak19]

So I got a Dynex 46 in lcd that would turn on and work for 5 min then screen would shut off. I could tell there was a bulb out as a area in the screen wasn't lit. So I bought a new bulb of same size and thickness. On one side it solders in and the other it just pushes in. But the side that pushes is is different. The metal part that comes out the bulb winds around the bulb and my new one doesn't do that. After I installed the new bulb it lights up just like the others but then it developed the 2 sec to black issue which it did not have before replacing the bulb. Any ideas.

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

Do y'all think its the bulb causing the 2 seconds to black since it doesn't have the coiled end

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

Does it matter which way the bulb goes in one side vs the other? The model of the tv is dx-46l150a11

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

So I tested all the transformers resistance between 1-2 and 1-3. And 1-2 read OL and 1-3 read around 760ohms. I'm guessing their reading correctly. This was with the tv unplugged.

[budm]

Re: Dynex lcd 2 sec to black issue

Do y'all think its the bulb causing the 2 seconds to black since it doesn't have the coiled end

What do you mean by 'coiled end'?

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

The end of the bulb that slides down in the socket the metal that comes out of the bulb coils around the end of the bulb

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

I ended up wrapping it around the bulb and putting the bulb in the socket the bulb lights up fine but then has the 2 sec to black issue

[budm]

Re: Dynex lcd 2 sec to black issue

I wonder if your panel uses CCFL or EEFL lamp. Do you have the panel model number?
https://cdn.badcaps-static.com/pdfs/...78a19a9c87.pdf

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

The panel number should be t460hw03 v.f

[budm]

Re: Dynex lcd 2 sec to black issue

OK, it uses CCFL:
3.7 Backlight Specification
The backlight unit contains 12 CCFLs (Cold Cathode Fluorescent Lamp)

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

What do you think I should check next on it.

[budm]

Re: Dynex lcd 2 sec to black issue

I am not sure, it does not make sense with the old lamp it will work for 5 Minutes, but with the new lamp you get 2-second to black, got to be something it does not like with the new lamp.
Did you try putting the old lamp back in?

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

I would but I accidentally stepped on it and broke it lol.

[Big Jugs]

Re: Dynex lcd 2 sec to black issue

I've got the same set, with a VERY similar problem. Where did you get the lamp from and what is the model, or specifications of the lamp if I was looking for one?. Also, how difficult is it to replace the lamp?

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

So I bought a backlight inverter board cause it was cheap and it didn't fix it. I'm guessing its gonna be the bulb causing the issue so imma call up ccfl warehouse and see if they know what kind of bulb I need to get.

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

It's not to hard to replace the lamp you just have to take the screen out of the panel to access the bulbs underneath. But be very careful as u will have to lift up the lcd screen as to not crack it or let it flop so it doesn't crack.

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

So I have dug this one out of the closet again and starting to work on it again. I figured I would go back to basics and check all my voltages. So every voltage checks out on my power board except the 32v pin. That goes to the main board. It reads .4v and when the set turns on creeps up to .7v before the set turns backlights off. I'm wondering if it's sensing it's not getting this voltage and shutting the back lamp down. I trie tracing it on the power board but don't seem to get anywhere. Here is te part number of te power board. 6ks01320a0

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

Also what does the det pin on te inverter board do. Cause when the tv is in standby it reads 0v then when the tv turns on and back light is on it goes up to like 70v then turns off.

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

I have also tried wiring up another ccfl bulb and it does the same 2 sec to black. I have already swapped inverter boards so I don't think the problem is there. I also reflowed the solder joints at the bulbs on the side that solders to the copper line. All of the bulbs light up bright but then shut off after 2 sec

[newtothis]

Re: Dynex lcd 2 sec to black issue

Have you D/c'd the main then forced the PSU and BL on?