Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Ahh okay I just took a quick glance at the data sheet and saw 5v. Didn't scroll down to max input.
I think I've tested everything you said so far... What else can I check?
All my caps appear to be good.
ma777
New Member
Last Activity: 08-23-2016, 05:40 PM
Joined: 03-08-2016
Location: MO
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Last edited by ma777; 03-28-2016, 05:51 PM. -
Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Two bulbs on 12V line and DMM on 24V line.. It stops working when I try to connect bulbs to the 24v line. BUT, If I connect the white back-light inverter cable the 12V line functions fine. If i disconnect it, the 12v line won't work!?
EDIT: With PS_ON Jumped
U44----------
Top-9.5
left-8.3
middle-9.57
right-11.08
Seems to be something wrong here... My V-in should be 5 volts at the maximum right?...Last edited by ma777; 03-28-2016, 02:57 PM.Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
What are the correct pin names? Don't want to say the wrong names.
U17-----------------------
Top-3.294
Left-2.053
Middle-3.295
Right-5.16
U21-------------------
Top-1.236
Left-0
Middle-1.236
Right-2.499
U22------------------
Top-3.297
Left-2.058
Middle-3.297
Right-5.18
U44------------------------
Top-0
Left-0
Middle-0
Right-0
Edit: A little history of the TV.
2HDMI...Last edited by ma777; 03-28-2016, 01:56 PM.Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Okay, rewired everything back to factory. (Vizio Light is orange) DMM is connected to ground and PS_ON. Pressing the power button gives no change in reading on the meter. Vizio light remains orange.
With the 2k in place jumping between PS_ON and 5V standby, with just one 12V light on the 12V pin it refuses to stay on. It will turn on for about a quarter of a second and then turn off.
When I tested it earlier today just 12V seemed to work fine and now it's not working. Maybe because the set had been completely...Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Okay just retested with no load. I doubled my resistance to 2k between PS_ON and 5V stand by. PS_ON is now reading 3.88V. With NO load I am getting 12V and 24V. I hooked up one bulb to 12V and had it lit up for about 15 seconds before turning it off. Then I went and wired up 2 bulbs in series for 24V rail. No dice, none of the bulbs turn on now. (100% sure I am using low filament.) I am hearing some whine from a capacitor not sure which.
Edit: Yes, with everything connected between main and power boards PS_ON shows...Last edited by ma777; 03-28-2016, 12:14 PM.Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
I don't think I am getting PS_ON from the main Board. With my DMM connected to PS_ON wire from the main board, I show 0 Volts when I press the power button. I am using the low filament but I will double check and try again.Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Just quoting you so you get a notification.
With the 1k resistor soldered on my PS_ON pin is reading around 4.5V. Using my DMM without bulbs connected I read 12V and 24V just fine. But with bulbs connected, I can't get a reading. I'm assuming having a load connected is causing the problem. The 1157s will not illuminate. So, at this point it looks like my power board and main board are shot?...Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Hey everyone,
This seems to be a great component level community! I have the same problem as the OP. The VIZIO light is orange and will not change to white when I hit power.
TV: VW42L-FHDTV10A
Below is a picture of my board.
I'm poking around at U19 and U20.
U19 (directly right of the top right corner of the heat sink)
Vin= 5.16 Volts
Vout= 4V initially and then drops to 2.503
ADJ= 3v initially and then drops...Leave a comment:
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