Re: Vizio VW42LFHDTV10A Dies after a few minutes
More info: I've determined that if the power supply is kept cool with forced air, the TV will never shut off. The heat sink with the mosfet looking guys on it gets very hot otherwise. Does this mean a PS problem, or could it mean another component is drawing too much power and causing PS overheat?
hrabbot
Member
Last Activity: 11-21-2016, 10:05 PM
Joined: 08-15-2016
Location: Wichita, KS
-
Re: Vizio VW42LFHDTV10A Dies after a few minutes
Please don't hijack my thread - this issue is unrelated to the issue I'm trying to discuss.Leave a comment:
-
Re: Vizio VW42LFHDTV10A Dies after a few minutes
Any advice on where I can find the nominal voltages for these ICs? I'm hoping to get this buttoned back up and off the floor of my office. I have a mainboard from a similar model that has all these regulators - should I go ahead and replace any or all of them?
Thanks much.Leave a comment:
-
Re: Vizio VW42LFHDTV10A Dies after a few minutes
Interestingly, U22 has voltages on all 3 pins while the TV is plugged in but not turned on (approximately as in the operating state). After failure, they are 0 as noted.Leave a comment:
-
Re: Vizio VW42LFHDTV10A Dies after a few minutes
Finally got it taken apart again and got these voltages. I'm assuming Pin1 on these is leftmost when the large solder tab is oriented upward.
Listed as Operating voltage first, after-failure voltage second.
U44:
Pin1 8.31V 0V
Pin2 9.57V 0V
Pin3 11.47V 0.15V(bleeding down)
U17:
Pin1 2.10V 0.00V
Pin2 3.36V 0.01V
Pin3 5.16V 0.35V(bleeding down)
U21:
Pin1 0V 0V
Pin2 1.26V 0V
Pin3 2.50V 0V
U22:
Pin1 2.08V...Leave a comment:
-
Re: Vizio VW42LFHDTV10A Dies after a few minutes
good call. You talking about the large 3 leg ICs?Leave a comment:
-
Re: Vizio VW42LFHDTV10A Dies after a few minutes
Sorry, what I meant was that I'm having a hard time sourcing a replacement. Probably just going to swap the mainboard....Leave a comment:
-
Re: Vizio VW42LFHDTV10A Dies after a few minutes
air cooling with a tiny fan seems to have lengthened the run time. Unfortunately, I'm having a hard time finding that component.Leave a comment:
-
Re: Vizio VW42LFHDTV10A Dies after a few minutes
I've got a zillion little stick-on raspberry pi heat sinks, think I should strategically stick those on some components?Leave a comment:
-
Re: Vizio VW42LFHDTV10A Dies after a few minutes
16 pin U29 - yes. MB pic attached....Leave a comment:
-
Re: Vizio VW42LFHDTV10A Dies after a few minutes
Nice! That's a good idea. I didn't realize bad caps wouldn't be affected by heat. Is there a IC number I should be especially looking at? I haven't found much info on this particular TV....Leave a comment:
-
Re: Vizio VW42LFHDTV10A Dies after a few minutes
I'll take a look at it again, but I didn't see any swollen caps. Any tips on finding info on the regulator problem?Leave a comment:
-
Re: Vizio VW42LFHDTV10A Dies after a few minutes
Any thoughts? I've found that a cooler indoor temperature seems to make it stay alive longer.Leave a comment:
-
Vizio VW42LFHDTV10A Dies after a few minutes
I've got a Vizio VW42LFHDTV10A that has two issues (maybe related?). The first issue is that it [B]sometimes will not power on the backlight[/B]. An on/off cycle or two always causes it to come on.
After it's powered on successfully, it will function normally for between 10 and 30 minutes, then [B]spontaneously powers off[/B] (and LED vizio logo goes completely dark). The sound dies also. The TV cannot be powered back on until the power cord has been removed and replaced. When I remove the power cord, then immediately reinstall it, the logo glows amber like normal, and it can be... -
Re: New Members - please post your introductions here
Hola. Been reading here, but haven't solved my TV problem, so time to join up
Leave a comment:
No activity results to display
Leave a comment: