Re: Appearing blue pixels on Sony LCD
If it don't work perfect it is not worth anything.. market is full of 5-10 year old big screens that do work.. broken ones are junk .. at least till we fixem! Sit on it.. it will be free soon enough!
airscapes
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Last Activity: 05-17-2011, 03:02 PM
Joined: 01-10-2011
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Re: Dell W3201c LCD TV
Well I think I have beaten it at last!
I took the PS off again and reheated adding a little solder to EVERY connection that was not a surface mounted part. I also replaced the fuse on the board (sorted it out with the metal cover on the hair dryer by accident) Don't think the fuse had anything to do with it since it was not near the hot air from the dryer.
As of now, the unit has not shut off, and I even put it all back together the other day.
I did not put the screws in that secure all the I/O connectors since I am not going to be...Leave a comment:
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Re: Dell W3201c LCD TV
I am getting closer! I had figured the No start at all condition I had a week ago was not the same as the shut off, they are the same.
If I start the TV cold it run for a 5-10 minutes and shut off. The 5v light is on the main board is on and the power button is lit blue.
Press power button 2 times slowly and the blue light goes out. Press it again and the other 5v and 12v leds blink on for a second and go out. If I wait long enough the TV will start and run for a while and shut off again. It seemed if I kept this up it would then stay on...Leave a comment:
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Re: Dell W3201c LCD TV
UG.. yep shut off again.. So.. I have created 2 new problems, and fixed both of those and still have the original and no closer to pin pointing what is causing it.
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Re: Dell W3201c LCD TV
I found this problem! Doubt it is the problem that I had to start, that one (shut down when it wants) is probably still there.
The back light not working and then flashing when the case was bump was caused by me.
I pulled off the DC-DC board to see if I could check the capacitors and when doing so, I pulled the board side of the connector I have circled up off the pins just enough so there was a bad connection.
To find this, I removed the LCD panel and hooked everything up with the case holding the backlight and inverter face...Leave a comment:
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Re: Dell W3201c LCD TV
Thanks for the offer! It is funny how I can get attached to junk I get for nothing.. guess I just don't like to be defeated.Leave a comment:
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Re: Dell W3201c LCD TV
Yes, TV is the same and Yes, my offer was $10 to start but he thinks it is more valuable since he actually paid full price for it a few years ago! I will do $20 for it if he every posts it again for sale. I am sure he won't get any takers at the $100 he has it list for. Just have to wait and make another offer in a few weeks.
I even offered to sell him my panel for $100 but he didn't want the tv to work, just wanted to make room.. but not letting it go for $20.....Leave a comment:
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Re: Dell W3201c LCD TV
I have done that in the past on this set. I had no idea what the resistance should be but I compared every transformer and all were identical.
I do believe my current problem is mechanical.
I just finished messing with it at lunch.
1. meter connected to the green wire on the inverter board connector
2. power on unit
3. very low voltage at this wire, 24v on the 4 brown wires.
4. Tap the case on the power supply side (not slam it but a medium bump whit a screw driver) and the voltage starts...Leave a comment:
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Re: Dell W3201c LCD TV
Thanks, I know there will be no getting new parts, I am working on getting another TV with a damaged LCD. I only want to spend $20 tops but the owner wants $80. Seems that everything works on it.. just has a cracked LCD..
In the mean time, just wanted to get this figured out for my own satisfaction.
I assume if all lamps fail to light then the tv will not turn on (no image on the panel)....Leave a comment:
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Re: Dell W3201c LCD TV
I know, I but I am kind of attached to it now..
Pulled it apart again and can not see anything physical wrong with the back light tubes but I am guessing that is where the issues is. When I power it on the back light does nothing, but if I give it a good hard shake or smack it, they start flashing. I have a green wire which is pulsing 0 to almost 5 volts. Brown wire are 23.89v and drop slightly as the back light pulses. Seems like it could still be power supply. However watching the back light pulse there looks to be 1 or 2 tubes (can...Leave a comment:
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Re: Dell W3201c LCD TV
Well now I've gone and done it!
I remove the PS and resoldered the connections you suggested and attempted to remove some of the flux with alcohol. Rather than reinstalling the PS I continued to disassemble the unit to gain access to the back lights. This involved removing a bezel that I had previously not removed and unclipping the LCD panel. Once I lifted the panel off I could lift the diffusers and see the tubes. Looked ok to me.. so back together it went.
I then removed the blue board to see if I could test the capacitors with the Fluke...Leave a comment:
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Re: Dell W3201c LCD TV
I will resolder all of them tonight. Sorry what do you mean by ring cracks?
Also, when resoldering these, is it best to remove the old solder or just add a bit of flux and new solder?
I did add a touch of flux and reheat the large connectors adding a bit more solder since I know the big connectors can require more heat and end up being cold..
TV is still on since 7:30AM.
Thanks again!Leave a comment:
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Re: Dell W3201c LCD TV
Good morning and thanks for looking.
1. The roundish transformer that seems to feed the rest of the unit is what I was calling the secondary.
2. Yes I used the meters capacitance function to test the capacitors on the original sound board and even removed them from the board but sound is no longer an issue.
3. I am starting to believe the "no start" and intermittent shutdown are 2 separate issues. As I said, I thought it was fixed after resoldering the power supply, however after Moving the unit to the Kitchen and...Leave a comment:
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Re: Dell W3201c LCD TV
Here are a couple of pictures of the complete unit (audio board is a Frankenfix) and the top and bottom of the power supply. Sorry for the poor lighting no sun expected for a few days.....Leave a comment:
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Re: Dell W3201c LCD TV
You want me to disassemble the entire unit and take photos of all the boards or just the suspect power supply?...Leave a comment:
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Dell W3201c LCD TV
Hi, first time poster, stumbled on this forum searching for tips on repairing this TV. It was manufactured in 2005 and from the info I can find had problems with the power supply and audio board. This one was a free bee from a guy on Craigs list so I have nothing invested to speak of.
History: TV will power off whenever it feels like it. Sometimes it will start back up if you hit the power button 2 times and runs fine for hours.
I pulled it apart and looked at ever single board for signs of a bad component. In researching (this is the first LCD TV I have played with) I... -
Re: New Members - please post your introductions here
Hi gang, I am a DIY person who need a hand with an LCD TV power supply. I have basic electronics skills but am no expert. I was a school trained auto mechanic for about 12 years and then switched computer programing in the mid 90's. Currently I an a Sr AIX Unix admin working 100% remotely from home. Will start off with some forum searches to see if the "answers are out there".. cut to xfiles soundbite..Leave a comment:
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