Re: Vizio VT470M, no display, components seem OK
To wrap this up, I finally found a main board (thanks to eBay alerts), and the TV is back working now. Thanks again!
Damfino
New Member
Last Activity: 04-24-2015, 07:34 AM
Joined: 02-08-2015
Location: Rochester, NY
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Re: Vizio VT470M, no display, components seem OK
Yup. OK, thanks for your help.Leave a comment:
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Re: Vizio VT470M, no display, components seem OK
Did you mean 5v STBY? I can't find any clues as to what SYBY could mean.
Just for checking, I cut the BL_ON wire going to the inverter, soldered on a 1k resistor, and connected it to an old 5V cell phone plug. In this configuration, the backlight comes on fine but the TV is completely non-functional - the normal blue screen doesn't appear and none of the buttons (other than power) do anything. That certainly lends further credence to the main board being the problem...... maybe I need to start testing caps, or just...Leave a comment:
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Re: Vizio VT470M, no display, components seem OK
Yuck. Not only is it the most expensive part, it's apparently pretty hard to find. Is this probably likely caused by just a bad cap, or something more serious? I'm all for trying to repair the board before just replacing it....Leave a comment:
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Re: Vizio VT470M, no display, components seem OK
By main board, you mean the main power supply?...Leave a comment:
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Re: Vizio VT470M, no display, components seem OK
Just for clarification, the screen is always black. I haven't been able to get any picture since it failed except for a brief time after removing and re-adding the original inverter (not the new replacement.)
I only see two fuses on the board, one large one (F2, 12a/125v) by the cable (as shown in the photo), and a small one (1v, 63v) about 2/3rd of the way to the right on the bottom. Both read 24.3v on both sides.
On the inverter board, where the cable comes in:
The 5 VBL lines all read 24.3v....Leave a comment:
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Re: Vizio VT470M, no display, components seem OK
There's not much to see, that's why I didn't bother originally. Anyway, here's the whole TV, the power supply, and the inverter that was replaced....Leave a comment:
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Vizio VT470M, no display, components seem OK
A couple months ago my VT470M decided to just stop working. I replaced it with a new TV then began looking into repairing it to mount it in another room. The symptoms are that the screen itself never comes on, but the Vizio light at the bottom does change brightness normally when you turn it on and off. I don't see any dim pixels at all.
I took it apart and based on my initial research, it sounded like an inverter board problem, so I bought a new one from ShopJimmy. "CMO 27-D029966 Backlight Inverter" When taking the TV apart before I ordered the inverter, I had taken... -
Re: New Members - please post your introductions here
Another new member trying to fix their TV. I haven't much experience in actually fixing LCDs but very comfortable working on PCs and some other equipment so am not too intimidated.
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