Vizio keypad/IR to j2 connection cable

[wdmickjr]

I have a non working Vizio VX42L HDTV10A.
It was bought 11/2007.
I live in the rural and there has been a lot of dirt bikes and ATVs running about. Here in Arkansas I has been very dry the last couple of summer seasons, and there fore lots of dust. I was concerned of the TV and other electronics ingesting some of this dust.
So the other day I went to turn on the Blu-Ray player and the Vizio TV. I heard a pop, and low and behold, the TV Vizio logo turned from amber to white, yet no sound or no picture. It would not turn off via remote or power button on the side. I unplugged it and went thru the same scenario.
So I have pulled the set from the wall and removed the back and was thinking I could clean it with a vacuum and maybe that would solve the problem. Yes, there was a lot of dust accumulation.
I have since cleaned it with a vacuum and looks very neat now.
I find NO bloated, ruptured, or leaking caps.
I find NO burnt or discolored components.
U33 looks good.
So I was inspecting all the boards and come to somekind of diagnosis, yet I am lost. Everything looks good; all printed circuits look excellent, all caps look good..
I am referring to from reading you guys posts on my exact model and most refer to bad caps. Or bad u33, u7, etc.
Also.. when replacing the inverter board I some how destroyed the KeyPad/IR board to the J2 connection cable.. yep the little black wire came from the module and is irrepairable.
Is there some where I can ground the little black wire elsewhere on the main board just to get it to come on now? No Vizio logo light at all now. I supoose perhaps cause the black wire is faulty on the KeyPad/IR board.
I have found another used cable bundle from a VX42L on eBay. That should come this week.
What Should I be looking for since all my caps look good?
What are the readings with an Ohm meter on the u33? u7? u9?, etc?
Shall I obtain another working main board?
What are the readings at the inverter board from the main board when everything is good to come out of STBY?

[wdmickjr]

Re: Vizio keypad/IR to j2 connection cable

sorry
i did not post model name in subject title.
don't know how to edit my posts as logged on..

[tom66]

Re: Vizio keypad/IR to j2 connection cable

If you heard a "pop" from the TV, the first place is to look at the power supply, as that may have had a failure. Look for burnt or discoloured components. Also, can you make a listing of all of the voltages along the connector going to the main board both in standby and after the power button is pressed?

[wdmickjr]

Re: Vizio keypad/IR to j2 connection cable

thanks for the reply, tom66.
yes I could take readings. yet i suppose i will have to wait on the used VX42L cable bundle i purchased from ebay.
I have removed all boards and checked for ANY discoloration, bloated, broken, cracked, on loose. that is where and when i found the black wire from the keypad to main board defective.
i have NO logo light at all, perhaps from no good ground from the keypad/main board connection cable. so i am waiting on that.

thanks.

[cliff_hootarski]

Re: Vizio keypad/IR to j2 connection cable

Also take a look at the two SMD fuses under the middle connector on the main board.

[wdmickjr]

Re: Vizio keypad/IR to j2 connection cable

Also take a look at the two SMD fuses under the middle connector on the main board.

those ohm'd good

[truep]

Re: Vizio keypad/IR to j2 connection cable

Maybe it's just me but I think I saw two bulged caps behind the connector on the power supply.

[wdmickjr]

Re: Vizio keypad/IR to j2 connection cable

Maybe it's just me but I think I saw two bulged caps behind the connector on the power supply.

I would gladly change these if i saw a chance i could.

[tom66]

Re: Vizio keypad/IR to j2 connection cable

They look fine. And they are Rubycon, which makes failure unlikely (not impossible, they're just very good caps so it's unlikely.)

[budm]

Re: Vizio keypad/IR to j2 connection cable

"U33 looks good" Do you mean the output voltage is good?
You can stiil take the voltage reading of all the LDO regulators and post the readings using the format as shown in the link on how to test the LDO.
I also see bulging caps on the power supply, unless it is bad reflection.

[wdmickjr]

Re: Vizio keypad/IR to j2 connection cable

Disclaimer: I would not know what I am talking about if I heard me last week right now. Everything I know I got from this Forum. Kudos.

When I say u33 'looks' good I mean appearance wise; visually. I have seen bad u33s on this forum and they looked like it would be a problem. No I have not metered it nor do I know how. I just know where it's at and NOT what it does.

[tom66]

Re: Vizio keypad/IR to j2 connection cable

I have had one voltage regulator look bad when it failed. (The centre tab pin had gone dark grey.)
Two which looked fine, but tested bad.

So I would class it as a rare occurance for a regulator to fail obviously, without testing it you would not know.

[wdmickjr]

Re: Vizio keypad/IR to j2 connection cable

me so sorry.
I quit.

[tom66]

Re: Vizio keypad/IR to j2 connection cable

Well, if you quit, then put it on craigslist for $20 and someone will happily take it off your hands and fix it easily.

[wdmickjr]

Re: Vizio keypad/IR to j2 connection cable

well me thinks there is a something hot rod fm sythenizer better than this and cheaper. go figure.
it is dang near 7 years old. i like plug and play. i have gotten an education with your forum. grande kudos, plus tax!

[wdmickjr]

Re: Vizio keypad/IR to j2 connection cable

I am sorry for abandoned this project. I had a lot of dire situations going on at the time..
where could I find specs when on at the voltage supply, inverters and main board?