Vizio VW42L problems

[chopsawkev]

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.

[selldoor]

Re: Vizio VW42L problems

Clean up the Cap pads with isopropyl alcohol to remove the flux -may as well replace the caps if they were new.
Perhaps start by testing the 4 mosfets.

[chopsawkev]

Re: Vizio VW42L problems

Clean up the Cap pads with isopropyl alcohol to remove the flux -may as well replace the caps if they were new.
Perhaps start by testing the 4 mosfets.

why should I replace them? how do I go about testing? Sorry, im not really sure how to use that PDF.

[MisterD]

Re: Vizio VW42L problems

A picture of the bottom side of the slave inverter board directly below where you soldered in the 2 new capacitors so we can see if there are any solder runs or shorts. I think selldoor is saying that you might as well reinstall (not replace) the caps if they were new.

[selldoor]

Re: Vizio VW42L problems

Hahaha - Yes that is what I meant Thanks MisterD

[budm]

Re: Vizio VW42L problems

OK, Please check the TVS Diode (you will have to remove it) to see if it is shorted out. This TVS is in parallel with the caps.
The 4 MOSFETs are set up as a full bridge drive, so the each pair is connected in series, so both of them have to shorted out which very unlikely but possible, but it is easier to remove that TVS Diode to see if the short will go away.
I hope you do have good 40Watts soldering iron.
By the way, the caps are not mounted with through hole mounting so the legs do not go through the board. They are mounted like SMD device.
To remove the Diode, you will ADD more solder to both end which will keep the solder hot, you will be moving the soldering tip back and forth between the two ends of the Diode then you can use the tweezer to remove it from the board