Re: Vizio VX42L Progress?
You guys were spot on with identifying the U2 reg as the culprit. I replaced both the regulator and the filter cap that fed the reg and the TV works perfectly! I cant thank everyone enough for the help and education! I have 4 left over 1117 adjustable regs if anyone needs them for their Vizio project. Shoot me a PM and I will gladly send them to you. It's the least I can do for others troubleshooting away here.
chummyb
Member
Last Activity: 09-01-2012, 08:42 AM
Joined: 08-22-2012
Location: Tucson
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Re: Vizio VX42L Progress?
Thanks for all the great info and leads. This has been (albeit frustrating at times) a great experience and learning opportunity for me. The supply store here in town only carried the caps, so I have replaced the filter cap that feeds the U2 regulator. I ordered 5 new 1117 regulators from digikey and will keep everyone posted on the outcome of the project!Leave a comment:
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Re: Vizio VX42L Progress?
@retiredcaps
I guess I will play it "better safe than sorry" on that one. There is only one specialty electronics shop that I know of here in Tucson that may or may not carry the parts I need and it is all the way across town for me. I was debating pulling the cap to make room to work on replacing that Reg, so might as well pull it and buy a replacement while I am there.
Thanks again for your time and knowledge! I really appreciate the help!Leave a comment:
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Re: Vizio VX42L Progress?
I see, I was able to trace the wires back to the main PCB, and they still only give me readings around 10mV and 98mV at the pins on the main PCB side. Possibly the bad voltage from the U2 LDO Reg is messing with the circuit responsible for this output and locking up the controls?Leave a comment:
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Re: Vizio VX42L Progress?
The PSON is an pin on the harness that is directed from the powersupply to the Main PCB. As I understand it, its function is to activate the secondary power from the Power Supply to the Inverter when it gets its 3V input. (Used to close the contactor in the relay mounted on the power supply?)Leave a comment:
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Re: Vizio VX42L Progress?
@budm
I do not see a label BL_ON. From the power supply, the multi-colored harness has 5-24V supply, and 5-SGND outputs. On the white harness there are 5-24V supply, 5-SGND outputs, and outputs from pins marked A and B. The outputs from pin A and B are 8mV and 97mV respectively. This is the only signal inputs to the inverter asside from the 24V and SGND.Leave a comment:
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Re: Vizio VX42L Progress?
Yes, here is a picture of the inverter board. All three fuses are good. Getting 24.6V at all 3....Leave a comment:
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Re: Vizio VX42L Progress?
@budm
Yes, the inverter board has that fuse, as well as the 2 white SM fuses. Continuity test said they were good (not open), <1ohm resistanceLeave a comment:
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Re: Vizio VX42L Progress?
Just confirmed U2 voltages and they are as reported. That is a stupid error on my behalf, as I thought I had checked and rechecked everything and came out with those differences but thats the blessing of another set of eyes. I will pick up a replacement tomorrow and let you know how it goes.
As far as the LDO regulators go I have seen lots of posts that claim that any part number "1117" is an adjustable regulator? I failed to look up a data sheet for the regulator which would have been the smart thing to do, but is there a general...Leave a comment:
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Vizio VX42L Progress?
I have been pouring over the TV repair threads for weeks now, and watching YouTube videos about these Vizio TV's and am stumped.
First off I have little to no background in electronics, but am very familiar with using DMM's and soldering equipment and the like. I am an A&P Mechanic so I know how to follow directions and look for discontinuities
My symptoms are similar to everyone else's in that the TV will turn on (Logo from orange to white) but that is the only response I get, and the set must be unplugged to reset (or press the reset button on the main... -
Re: VIZIO VO42L FHDTV10A No Video
I have been reading through all of these forums trying to make sense of a Vizio VX42L for days now and have found a few key differences in my model v. everyone else. First off I keep hearing about a master and slave inverter to contol the backlighting. On my model there is only one board (ballast board) to control the ccfls in the tv. I am having the issue of turning power on, the logo goes from orange to white, but get no sound or picture (also cannot control tv after initial power on and set must be unplugged to return to orange logo). I have...Leave a comment:
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