Vizio VW42LFHDTV10...Brother Mikes TV...

[stefnopolis]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

Yes I know those pins are extremely small but if i succeed I will be feeling very good about the work ive done and $ I have saved. I bought this tv fried and sofar I have spent on a fuse, a restock fee, and the circuit/transistor kit. If I fail I wont be feeling bad about buying the master or having someone solder those pesky pins. Besides I have done plentyof smd's no problem... hopefully this will be a similar task.

[Dgtech]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

I'm surprised you didnt just replace the board. I've replace this chip several times on different sets. It's a task that I wouldn't suggest taking on unless you're a pro at soldering.

What is the numbers on the inverter board you are fixing??

[stefnopolis]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

Fortunately yes. Instead of looking for all of them individually I just purchased the already assembled kit from ebay. 15 bucks ... sure why not.

[PlainBill]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

Never mind. Just picked up the part.

Are you also getting the transistors?

PlainBill

[stefnopolis]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

Never mind. Just picked up the part.

[stefnopolis]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

100% sure its the master inverter.. anyone know where to get the MU1 integrated circuit?

[rmoody]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

Found the culprit!! After careful inspection found one of the pins fried on the Master inverter. I believe it is MU1. It has 16 pins on both sides. Now, where to get the part... anyone?

yep, If there is no backlight, you needed to check the 24v line coming from the power supply and if you have 24v there, you can pretty much bet its in the inverter.

[stefnopolis]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

Found the culprit!! After careful inspection found one of the pins fried on the Master inverter. I believe it is MU1. It has 16 pins on both sides. Now, where to get the part... anyone?

[Dgtech]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

If so, is there a way to repair the inverters? Or , would I have to have them replaced?

It would be nice to be able to SEE these inverters to know what type and what you should check next. Flying blind sucks.

[stefnopolis]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

The mainboard I ordered finally arrived. The components and numbers all matched on both boards pefectly. The only exception being the middle numbers 0472 and 0502. Other than that... same exact board. So I switched the boards out and still same problem. I believe, that eliminates the mainboard as the culprit. I placed my tv in a pitch black room as suggested and turned it on. No light what so ever besides the Vizio logo. With the lights being off I am asuming that it is not the TCON and leaning 100% toward the inverters as the culprit. Will check them out tomorrow and post findings. If so, is there a way to repair the inverters? Or , would I have to have them replaced?

[stefnopolis]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

I have not changed the mainboard yet DGtech. Still waiting for its arrival. The only difference in the fuse I replaced was the pigtail part (mounting). Yes I will have to get a meter. I want to check the caps and regulators. Hopefully my situation is the same as King's and I can follow his steps. This way I can return the main board I orderd.

[rmoody]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

What has been done so far with your set has all been done without using a meter to check a fuse? You've replaced the main board with no success. The wasted money and wasted time could have been avoided if you would have posted pictures of what you had in the first place. We could have told you where to find the proper fuse and then we would go on from there. Now you are backtracking saying that the fuse wasn't really secure?

Post pictures of the whole set and then post pics of the individual boards, including the master and slave inverter boards (if any, would be on the right and left side under a cover).

Then go to wal-mart to the automotive section and buy you a digital multimeter for like 15 bucks. You will need this many many times and it's a decent DMM for the price.

[Dgtech]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

What has been done so far with your set has all been done without using a meter to check a fuse? You've replaced the main board with no success. The wasted money and wasted time could have been avoided if you would have posted pictures of what you had in the first place. We could have told you where to find the proper fuse and then we would go on from there. Now you are backtracking saying that the fuse wasn't really secure?

Post pictures of the whole set and then post pics of the individual boards, including the master and slave inverter boards (if any, would be on the right and left side under a cover).

[stefnopolis]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

I have no equipment to check wheather the fuse was the culprit or not so I decided to give it a shot.

[rmoody]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

why did you replace the fuse in the first place? was it bad?

[stefnopolis]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

Thanks Bill. I had no idea. Appreciate the help

[PlainBill]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

Oh btw, It was extremely difficult for me to put that new fuse back on because the old one had some "caps" attached to both sides which I could not remove from the fuse and reuse. I had to do a terrible soldering job in order for it to stay in place ... that and some loctite super glue lol. Im not satisfied with this. I am not satisfied with this at all! Any suggestions on a proper fitment method?

Buy the proper fuse. The original fuse was a pigtail fuse; the replacement was designed to be used in a fuse holder.

PlainBill

[stefnopolis]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

Oh btw, It was extremely difficult for me to put that new fuse back on because the old one had some "caps" attached to both sides which I could not remove from the fuse and reuse. I had to do a terrible soldering job in order for it to stay in place ... that and some loctite super glue lol. Im not satisfied with this. I am not satisfied with this at all! Any suggestions on a proper fitment method?

[stefnopolis]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

hmm.. well, Im not 100% sure if I see a tint on the screen. Havent checked in the dark though. I almost feel like I see a dark dark blue color on the screen but my eyes may be deceiving me. Anyway.. which one is the lcd controller/Tcon? I see 2 inverters left and right, power supply up top, mainboard underneath power supply, and a small board above the power supply under a metal housing. I am assuming its the one above the power supply? If so.. what can I check on that particular board to c if it is the culprit? Any dead give aways? Also, Before and after I played around with the power supply... before, I would turn the TV on and the amber light would stay on for 2 sec then go back to a steady white. After, now that I have replaced the 6.3Amp fuse the lights are steady. I plug it in and get steady white.. turn on and get steady amber. It no longer goes back to white after a sec. of me pressing the power button. Does this mean anything?

[rmoody]

Re: Vizio VW42LFHDTV10...Brother Mikes TV...

Well... its 100% not the power supply. Now when I plug the tv in I get a steady amber light and when I turn it on a steady white. Gotta wait for the main board now.

do the backlights come on when powered on? It could still show a black screen with a tint of light. The lights can be easily identified with back cover off in the dark. If they power on I would suggest buying a new lcd controller/Tcon board.