Vizio SV320vxt popping fuses like it made it up.

[shwsrvcs]

Re: Vizio SV320vxt popping fuses like it made it up.

oops forgot to resize those images

[shwsrvcs]

Re: Vizio SV320vxt popping fuses like it made it up.

Hello again. I checked out the bridge rectifier and found it in bad form. Using my multi meter to test diode (ohms) and also for continuity. Well no change on the level in either direction (i posted the readings for the same posts on my multimeter in both directions below, I checked the IC901 pins and they all appear to be far enough apart (also images below) and I removed the heat sinks to view no evidence if any objects or odd connections. Yes the fuse was the T4Ah main ceramic fuse, although, I just noticed I had put in a 5a after the last one blew last week.

So with that bridge rectifier apparently done for and perhaps at the root of this poppin and lockin the TV has been doing... it's looking like a trip to MarVac in Costa Mesa after I pick my son up at school in a hour or so

[tom66]

Re: Vizio SV320vxt popping fuses like it made it up.

Are you referring to the T4AH fuse on the board, when you say it keeps popping fuses?

[selldoor]

Re: Vizio SV320vxt popping fuses like it made it up.

Its a long shot but if the tops screw off the heatsinks can you do that and make sure they are not touching anything underneath. I am asking as the solder at HS1 has brown (probably flux) but no other joints have.


ALSO pins on IC901 look awfully close - do they touch.
I dont know if they are meant to.

[shwsrvcs]

Re: Vizio SV320vxt popping fuses like it made it up.

I'll be testing those tonight as soon as I fer home!

[shwsrvcs]

Re: Vizio SV320vxt popping fuses like it made it up.

Thanks for the quick replies!

Here are some pics of the powerboard. thanks again for you assistance! Hoping with some time I'll be able to do likewise for others here.

I'm looking forward to checking back in when I get back from a house call for a client.


cheers! to you all!

dave G

[multimeter]

Re: Vizio SV320vxt popping fuses like it made it up.

down shot of the power supply please?

[multimeter]

Re: Vizio SV320vxt popping fuses like it made it up.

highly likely its the (in order) bridge rectifier,followed by a shorted main primary cap,then the mosfets,test in that sequence

[tom66]

Re: Vizio SV320vxt popping fuses like it made it up.

Thanks for the good pictures.

The capacitors look okay. I have a board from an LG which has caps which look a bit like that (vent appears to bulge) but SMD caps do that (they all test okay.) I believe it's due to how they are manufactured.

If your TV is popping fuses, it's more likely to be the power supply than anything else. Capacitors would be unlikely to cause this; common failures are the bridge rectifier and MOSFETs - both of which are relatively easy & cheap to replace. Can you supply pictures of the PSU?

[shwsrvcs]

Hey all. I am hoping to 2 get some advice/help on this model. the one that I have is blowing fuses, the caps on the power board and the power board look okay to me. The main board, not so much... It looks to me like a lot of blown cap's on that but I never see many pics of blown caps oF that type. I have highlighted them in the attached images of the main board.

I know that the more info I have I can better form an opinion so with that in mind, I also took a bunch of other pics of the power and main boards with my camera in different lighting and those can be seen at.

http://www.avdigitalsound.com/jackstin2

I am waiting for and order of capacitors to arrive that I think will do the trick, but just in case. do any of you know what the numbers are on the top? I assume it's the same as electolytics but I would like to be sure before I go popping them off and putting on incorrect spec replacements...

Any help you guys can offer would be and incredible help!

Dave G