Re: Group Buy: CH341A Programmer
I just tried to e-mail [email]skygz@qq.net[/email] and it bounced back. Is there some other way to contact the developer of this software?Re: Group Buy: CH341A Programmer<br ...this software?Re: Group Buy: CH341A Programmer
I just tried to e-mail [email]skygz@qq.net[/email] and it bounced back. Is there some other way to contact the developer of this so...
knappster
Member
Last Activity: 11-13-2019, 04:06 PM
Joined: 01-17-2016
Location: Peoria, IL
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
Thanks for the help guys! I first replaced the slave inverter with no improvement. Next I replaced the master inverter and it seems to be working just fine now. I took a photo of the screen lit up and I also took a photo of the back of the bad master inverter. I suppose the discoloration might give some indication where the failed component(s) is/are. So I probably now have a spare slave inverter as well. Thanks again....Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
Thanks guys. I will give that a try and let you know what happens.Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
budm, I haven't seen you respond since I posted the video. I just wanted to ensure that the photo was not misleading. Is your diagnosis still the same? Thanks for the feedback.Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
Okay, I have confirmed the LCD and audio still works by plugging it into an HDMI source. I have taken the readings you requested again. I think i must have omitted one of the cables last time, but the results of it did not seem unusual. I think there is one more cable that is going from the PSU to one of the inverter boards. Do you need that measurement as well?
PON: 3.0
GND: 0
5V: 5.1
GND: 0
GND: 0
16V: 15.8
16V: 15.8
GND: 0
5V: 5.0
...Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
Alright, well I was unable to track down my digital camera, so I did the best I could with my cell phone camera. I have 3 pictures of each board. One of the entire board, and then top half and bottom half of each board. Hopefully this has the detail that you need. If not, I can try again when I get the free time.
I may have some more challenges ahead, though. I just plugged the TV in for the first time since I stripped it all down to ensure that I was still getting the "Please Wait..." LCD display, and...Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
I will try to get these photos this weekend. Are there any specific components you may want to see closeups of?...Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
How about google drive? Does this video help?
[url]https://drive.google.com/file/d/0B5Mi4VGa-JL2RHhzNDYzZW5WT0E/view?usp=sharing[/url]Re: Dynex DX-LCD42HD-09 goes blank a...=sharing[/url]Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
I tested all of the little white fuses in the beginning and did not find any issues. Are there more fuses I should be checking for? And can you point me to a guide on testing the MOSFETs? Sorry, I've searched a bit here and on google and haven't really found anything specific to the application....Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
I'm not sure if the picture is misleading... when I was watching in person, I didn't notice only one side lighting up. When I watch the video again, it appears that the entire thing comes on brightly, then the light moves to the right... this may just be the camera adjusting for the brightness though. Is it possible for just half of a CCFL to light up? Is there anyway to upload the video so that you can view it?...Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
Is this the same as the "BON" pin on the power supply? It is already reading 5V....Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
Alright, I got everything torn down and powered it on with just the inverters connected to power and all 16 lights came on for the couple seconds, then went off again. I have a screenshot of a video I took of the lights coming on that I've attached. I have also attached a couple photos of a capacitor on the power supply that looks a little bulgy and a photo of the model of capacitor on the inverters. The power supply cap may explain the issues I was having previously with the power sometimes acting up when turning the TV off?...Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
Thanks for all of the advice. Time is at a premium with a two year old running around the house, but I am hoping to try to disassemble this while the little one is running around tomorrow. I will follow-up once I have checked it out. Could be tomorrow, could be in a couple weeks.Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
Unfortunately, when the backlight kicks on, the screen is black with just some text saying "Please Wait..." and only lasts a few seconds so I'm not sure I will be able to see if there is a darker region unless it happens to be where the text is. Next time I get back to it, I will try to look closer. Are there any tips on testing the caps and transformers or do you typically just start replacing components? It looks like I could simply buy the master/slave inverter pair to replace the entire boards at...Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
Thanks for the response. Is there any trick to getting to the bulbs? Based on everything you guys have said I wonder if maybe a bulb burned out and needs to be replaced. However, I imagine it is not a simple task to get to the backlights....Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
That is correct. When I turn the power on, the backlights do come on for a few seconds, then go out. The measurements were all taken with power on, but the backlights had already gone out....Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
Thanks for the response. I checked 4 fuses on each of the two inverter boards. They all tested okay (short circuit). The resistance of the windings all read between 1.052k and 1.079k so that falls within the 3% you suggested. I have not replaced any capacitors yet, because I first wanted to get additional feedback based on the information provided to you and CapLeaker if you think that might be the issue or if it is likely to be something else. Thanks....Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
One of the ribbon cables:
PON: 3.0
GND: 0
5V: 5.1
GND: 0
GND: 0
16V: 15.8
16V: 15.8
GND: 0
5V: 5.1
GND: 0
5V: 8.8
GND: 0
32V: 32
The other ribbon cable:
BON: 5.0
PWM: 3.3
GND: 0
GND: 0
GND: 0
GND: 0
GND: 0
24V: 24.2
24V: 24.2
24V: 24.2
24V: 24.2
I have confirmed that it has both audio and video on HDMI input 1, but...Leave a comment:
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Re: Dynex DX-LCD42HD-09 goes blank after a few seconds
Maybe I didn't provide enough information initially. I have taken photos of the main circuits that I could find. If there is any additional information that I can provide to assist in tracking down the fault, please let me know....Leave a comment:
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Dynex DX-LCD42HD-09 goes blank after a few seconds
I have a Dynex DX-LCD42HD-09. When initially plugged into the outlet, the red LED comes on. When turned on, the red LED turns green and the backlight comes on and the "Please Wait..." white text appears for about 1 second before the screen goes blank and the backlight goes out. The power LED remains green until I press the power button again. About a year prior to this, the TV was working completely normally except for one annoyance. On occasion, when the TV was powered off, the green LED would turn red (which is normal) then about 15 seconds later it would turn green again even though...
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