VIVO 40" LCD (LTV40FHD) No Picture

[mickjh64]

I have seen a similar thread on this forum; well over a year old so I thought I'd start afresh.
Plugged in to mains gives red status indicator
Power switch pressed changes to blue indicator
No signs of source image or menu display.

This happened just before 12month warranty expired. Set was repaired. The same problem has re-occurred almost 12 months later...must be some weird anniversary thing.

Removed power board and identified caps C34, 36, 41, 42, 43, 44 (see orange circle) had been replaced . . messy soldering. Everything else looks clean, no signs of any damage, burning, electrolytic bulge or discolouration of other caps.
Images of power and video processing boards attached. I can post images of whole rear assembly and solder side of power board if necessary.

Same problem maybe??

[vinceroger69]

Re: VIVO 40" LCD (LTV40FHD) No Picture

hi although the other capacitors look good they may still be faulty this is where a esr meter comes handy a tip try heating the whole power supply board with a hair dryer for about 4 minutes and then see if the screen lights up as normal i have a psu im working on at the minute and when heated its working great so i have just ordered every capacitor for the board it worth a try at least.

[mickjh64]

Re: VIVO 40" LCD (LTV40FHD) No Picture

Finally had a chance to get back to this one. On closer inspection, It looked as though the caps may have only had their solder joints attempted to be reflowed. The work was pretty shoddy; dry joints and flux residue. I removed the caps, cleaned up the board pads and resoldered the components. Worked a treat.

Hope this helps someone else with a similar problem.

[dahbrown]

Re: VIVO 40" LCD (LTV40FHD) No Picture

Hi. I have the same issue on the same caps. Looks like it has been resoldered and real shonky at that!

The caps look burnt, and I can't see values on them. Also difficult to find a schematic.

Any idea how I can find the cap values, so I can replace them?

Thanks