Dynex lcd 2 sec to black issue

[Locutor13]

Re: Dynex lcd 2 sec to black issue

I was able to remove the protection of the backlight by shorting the pin 14 "Timer" of the chip U201 to ground as shown in the attached picture. Also you will see next to the chip a series of jumpers J213,J219,J209,J208,J212 & J211 each one for smalls caps or resistors and each has two small semi circles.

If you know the right combination you can match the settings of the ccfl according to the specifications of the protection by shorting some of those semi circles.

Be aware that removing the protection should be done only for testing purposes as if posses a serious fire hazard.

[Locutor13]

Re: Dynex lcd 2 sec to black issue

Hi, I have the same Dinex DX-46l150A11 with the same problem of getting the 2 sec the black issue after replacing the same ccfl (not original) of T6. Has anyone been able to find a solution?? Please Help.

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

I called ccfl warehouse and they don't sell any other kind of bulb other then the regular probe ends. So basically I think I might be screwed on this one.

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

So I looked at the panel schematics under the inverter section and all the conditions the inverter needs to see to be functional are all present on the inverter when it's off. The only thing I can think of is somethig with those bulbs. But I just don't understand it and I don't know where to get any.

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

So I tried forcing the backlights on while the main was unplugged. I jumped 5v to ps on an 5v to bon and the back light lit up for 2 sec and then shut off. So I have no idea what to check next. Anybody got any input. Getting frustrated with this one.

[audiofreak19]

Re: Dynex lcd 2 sec to black issue

No I haven't. I wasn't sure if I could do that or not cause the backlight gets 24v but does have a bl on. What would psu be. The power on circuit.

[newtothis]

Re: Dynex lcd 2 sec to black issue

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

[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

[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

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

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 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.

[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

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

[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

What do you think I should check next on it.

[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

The panel number should be t460hw03 v.f

[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

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