Re: Vizio VW42L problems
why should I replace them? how do I go about testing? Sorry, im not really sure how to use that PDF....
chopsawkev
Member
Last Activity: 03-10-2013, 04:32 PM
Joined: 02-11-2013
Location: philadelphia
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Re: Vizio VW42L problems
im seeing 0 ohms between the positive and negative pads on the board with or without the caps solder to the board.
here is 4 pan shots of the board, from right to left. let me know if you need better ones. thanks again.
also I apologize for my poor soldering skills, I've got a cheap gun at home that i fried last night. ill grab my good one from the garage today....Leave a comment:
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Re: Vizio VW42L problems
My friend did not attempt to fix it nor did anyone else. He said that he bought it new.
He said that when it went he heard a pop, then no screen. he didnt say whether or not it went to standby (this was months ago)
I thought I might have shorted the board out, everything looks good though. I wicked the solder up and im still getting the short.
I cant see anything totally out of place, I've been looking all over. I can hear the PSU buzz when it starts up though. also the LED on the master lights up and then fades away....Leave a comment:
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Re: Vizio VW42L problems
yes, it still returns to standby.Leave a comment:
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Re: Vizio VW42L problems
ive got the slave off and in my hand. I've checked a cross the caps, and im getting continuity between the positive and negative. i removed the caps and checked the board and im still getting continuity between positive and negative. im guessing this is where my problem is. now what on the board could be bad? i dont visually see anything wrong and with it and im guessing it will be hard to test if everything is grounded out? again im just shooting from the hip here, i dont really know what im doing, please correct me if im chasing my tail ...Leave a comment:
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Re: Vizio VW42L problems
so no change when the master and slave are separated. the only time i get normal voltage is when the power to the slave is removed. and when that is removed, the pins providing the slave with power seem to be normal ...Leave a comment:
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Re: Vizio VW42L problems
hey guys, sorry i had a busy weekend. Ok so ive reinstalled all of the board screws and snugged up the rest. ive disconnected the tcon from the rest of the tv and im still getting the voltage drop and the TV is returning to standby after 90 seconds.
Still the only way for me to get regular voltage to the main board is when the slave is disconnected. im going to try disconnecting the master from the slave and see if i still get the voltage drop at the main.Leave a comment:
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Re: Vizio VW42L problems
i replaced them, i push them up and no change.
any suggestions on what might be telling the set to turn off? how do i cehck the inverter transformers?...Leave a comment:
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Re: Vizio VW42L problems
this is power on, inverters unplugged.
U2
AMC1117
F0734F
PIN1 2.01v
PIN2 3.26v
PIN3 5.08v
U7
AMC1117
F0734F
PIN1 .03v
PIN2 1.27v
PIN3 3.26v
U8
AMC1117
F0734F
PIN1 2.055V
PIN2 3.299V
PIN3 5.17V
U9
K1117S15
745
PIN1 0.003V
PIN2 1.5V
PIN3 3.26V
U33
AMC1117
F0734F
PIN1 2.02V
PIN2 3.26V
PIN3 5.08VLast edited by chopsawkev; 02-20-2013, 04:25 PM.Leave a comment:
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Re: Vizio VW42L problems
budm,
ok so if the inverters are plugged in, voltage at PS_ON is 0V at standby, 3.1V at power. it returns to 0V when the tv goes back to standby (90 seconds or so). with the inverters unplugged, I get the same results. also with them unplugged, at power, I get the 12v to the main and the 24v to both inverters. the 12/24 go away when the tv returns to standby (still about 90 seconds or so).
However, with the power on now, the LDO's are yielding different, higher results. would you like me to do a rundown again on them all with the...Leave a comment:
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Re: Vizio VW42L problems
also how do i check the transformers?
BET 2544 42l3 bja2c07a12 is the part number.Last edited by chopsawkev; 02-20-2013, 03:01 PM.Leave a comment:
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Re: Vizio VW42L problems
If I unplug bother inverters, and disconnect the boards from the chassis, with only the ribbon connector between the two, i still get ground at the 24v pins on the slave. that can only lead me to believe that the ribbion connector that runs to the TCON is what's providing ground. am i chasing my tail here? is there supposed to be ground there?Leave a comment:
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Re: Vizio VW42L problems
the hairdyer trick yielded no results except for making my apartment smell like my girlfriend just got out of the shower.
vinceroger, what part is the slave transformer? could you point it out?
all of the 24v pins are grounded on the slave side. I don't know what that means, but just thought maybe that doesnt seem right. if I fire the tv out without the slave plugged in, I get a blue LED on the master inverter for a couple seconds.Leave a comment:
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Re: Vizio VW42L problems
So im getting continuity to ground on all the the 24v pins on the inverters?
*edit* i get this if the slave is hooked up, not the master. if just the master is hooked up, no continuity to ground on the 24v pins. problem must be on the slave then?Last edited by chopsawkev; 02-20-2013, 01:35 PM.Leave a comment:
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Re: Vizio VW42L problems
ok now we are getting somewhere ...
I dont have a b/l pin.
with the inverters unplugged, the tv still stays on for about 90 seconds before going back to standby.
If I check voltage at the main board (with the inverters unplugged) i'm seeing what I guess would be normal voltage. here is the run down.
Ps_on
p1 - 3.1v
12v
p2 - 11.6v
p3 - 11.6v
p4 - 11.6v
sgrd
p5 - 11.4mv
p6 - 11.4mv
p7 - 11.4mv
p8 - 11.4mv
5vsb...Leave a comment:
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Re: Vizio VW42L problems
the smd on the interverters are fine, and just to idiot check myself, im getting 110ish volts AC right up into the PSU.Leave a comment:
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Re: Vizio VW42L problems
visual bloating on the caps on the inverters.
im not getting 24v or 12v on any of the pins the PSU. however, the set won't stay on long enough for me to get a good measurement. I agree that the something is wrong on the PSU, im just not sure on what im exactly looking at/for. how do i check caps besides visually?
when the power button is pressed the voltage spikes and then quickly trails off ... the most I see with my multi is 3 to 5 volts peak.Leave a comment:
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Re: Vizio VW42L problems
same goes for the barrel fuse (I think that's what it is) in pic 4 on the left.Leave a comment:
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Re: Vizio VW42L problems
im getting 0 ohms on both. I get continuity between both ends of the fuse.Leave a comment:
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Re: Vizio VW42L problems
sorry i posted two pictures of the slave, here is the master.
also you can see the caps that I replaced on the master and slave unit....Leave a comment:
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