Re: Viewsonic VT3745 powering up issues
Are there places that I could send the MB off to to get fixed? After a bunch of searching, I cant find a MB anywhere!
Also Thank you very much for all the help Budm you rock!
Midnightalaskan
Member
Last Activity: 12-15-2013, 07:37 PM
Joined: 12-02-2013
Location: Sacramento CA
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Re: Viewsonic VT3745 powering up issues
Damn! So just volt tick stuff untill I find a problem or find a new mb? Well at least it kinda works... I better get it back together before the wife kills me!Leave a comment:
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Re: Viewsonic VT3745 powering up issues
Any suggestions about what to try next?Leave a comment:
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Re: Viewsonic VT3745 powering up issues
After some extensive searching.... I only found one main board online for $100... Used and off ebay. I'm hoping it's not the MB but if it is, can the MB be repaired to a point?Leave a comment:
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Re: Viewsonic VT3745 powering up issues
Wire reconnected, used a 1k resistor between 5v and BL on the main board... After successfully shocking myself, I was not able to get the backlight to come on unless I put the probe between the 12v and BL as explained above.
I just did the 12v to BL for a second and I do not see the tv working when the ccfl is on. In fact it is only on when the the standby light is blue but shuts off when it goes back to orange. Something keeps kicking it back to standby (orange light).
Ok after 100 tries of the power button I got...Last edited by Midnightalaskan; 12-06-2013, 12:47 AM. Reason: Got the tv to kick on so I can volt tick it.Leave a comment:
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Re: Viewsonic VT3745 powering up issues
Should I repair the PWM grey wire I cut first?Leave a comment:
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Re: Viewsonic VT3745 powering up issues
Just got home and did a little probing (to the tv not the wife
) after cutting the I_pwm it seems I have lost my ground through the metal frame of the LCD display. When I ground to the frame and volt tick everything on the PSB, inverter board and main board I get around 1.5v on my meter on everything. If I ground it to the ground stud on the PSB, everything shows correct voltage. Just as a recap with the unit "on" I get the following out of the PSB
Going to the main board:
Acd 3.4v. P_on 2.8v
3-5v posts...Leave a comment:
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Re: Viewsonic VT3745 powering up issues
Cut the wire and nothing changed. No backlight.
Standby light still does it's off on off thing too. All voltage at the PSB (5,12 and 24v) look fine when trying to power on.Leave a comment:
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Re: Viewsonic VT3745 powering up issues
Just caught that. Nothing on that grey wire I_PWM
Yah it's like I have to keep trying until it decides we are worthy enough to watch a movie.
It works... Kind of... But not to spec.Leave a comment:
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Re: Viewsonic VT3745 powering up issues
Yep! 24v on both side of F1 and 2
This is why I'm so dang confused! Everything I have poked at says it should be on.Leave a comment:
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Re: Viewsonic VT3745 powering up issues
F1 has continuity as well... no prob on the photos! I have to give that to my iPhone camera
What strikes me as weird is how after a bunch of tries it will turn on and work... The standby light will sometimes go from orange to blue and stall (I then have to unplug it and try again) and some times it will go from orange to blue then 5 seconds later to orange again.... I keep pressing power on and it will cycle like that for a while and then kick on an work.... My wife gets it in like 5 tries... With me it's like 50....
...Leave a comment:
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Re: Viewsonic VT3745 powering up issues
I get 24v on each wire at the inverter board. I also have a few too many numbers to figure which one is the part number. If I had to guess it would be e74060.
I have the connectors photo and a shot of the other label with numbers on it.
Photos on the bucket (phone is giving me issues trying to load directly on here)
Also the fuse F2 at the inverter connector (at least that what I think it is) showed continuity when tested.Leave a comment:
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Re: Viewsonic VT3745 powering up issues
Ok... Again I do apologize for the double post! I can't find the edit button to save my life on this blasted phone!
I volt ticked that BL point and I must have messed up last time.... I have BL going from the PSB to both the main board and the ccfl board (or whatever it's called) both BL points measure anywhere from 1.3 to 1.7v and are the same V at every point (on the PSB, main board and ccfl board) that is both when it is off (orange light) and "on" (blue light)
Home that helps a little!
...Leave a comment:
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Re: Viewsonic VT3745 powering up issues
I uploaded a photo of the whole board... It is the one that mmartell listed from what I can tell... But you can look in the photo bucket for the pic I just took.
Now that I am home... I can do anything that is needed in short order.
Thanks y'all!Leave a comment:
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Re: Viewsonic VT3745 powering up issues
Damn it! Ill snap one when I get home of the whole board. I do apologize! I figured close up so you could see the writing would be good. didn't even think to take one whole shot. the unit that mmartell listed looks identical in every way that I could see...
If you do need a pic, Ill have it uploaded to my photobucket around 6pmLeave a comment:
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Re: Viewsonic VT3745 powering up issues
I hate to double post but looks like my wife is a little unhappy that our only TV is in pieces in our living room.
Anyone have any idea on what to look at next?
Thank you for your help!Leave a comment:
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Re: LG Plasma 60pk950-UA no picture or sound
Cool! Glad I asked, I've seen a few of em before and wanted a little clarity. Also didn't know it was a rare thing for the bottoms to go first.
Well good luck! That's all I'm good for!...
Leave a comment:
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Re: LG Plasma 60pk950-UA no picture or sound
I was just looking at the photos and in the 3rd picture I see a few bent caps on the primary circuit. I'm no pro, but isn't that a sign of a bad cap? I just figured I'd say something cause I want to know if they are (possibly) bad.
I'll wait for a veteran to speak up. I just wanted to point and ask...Leave a comment:
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Re: Viewsonic VT3745 powering up issues
Alright! After much frustration and dealing with my slow internet speed.... I come bearing photos! Here is the link to my photobucket for all the circuit board photos:
[url]http://s843.photobucket.com/user/midnightalaskan/library/Mobile%20Uploads[/url]
Budm, I checked the BL points and I get nothing on or off... I also did a continuity check on all the connecting wires just to rule out a broken wire and everything checked out... I think I will reinstall the original caps because after looking, I was wrong and the...Leave a comment:
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Re: Viewsonic VT3745 powering up issues
Well I will definitely get the photos loaded once I am back at the house. I will also look at the caps to see where they came from.
I collect caps and other useful parts from power supplies and actuators for HVAC units. I will scrap any good part off of a circuit board if I can, I always find a use for 'em! I know they are not "new" but a lot of times I find that when I need them, waiting for the right parts is not doable or I do it to "get it along" until the right parts come in.
I figured...Leave a comment:
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