Re: Samsung le40b655 makes high pitched noise, then turns off - no picture

I've done some testing.

Main caps measure about 310V across each. They do hold their charge when the power is unplugged. It trickles very slowly away.

5, 13 and 24 V supplies all measure correctly. I've not tried loading them yet.

All semis (transistors, diodes, etc) semi-tested and appear fine.

I only saw two fuses and both are fine.

Hi!

I have a Samsung le40b655 TV that doesn't work right. Here's what it does after you plug in power:

Indicator LED turns on, red.

If you press the power button, the LED starts blinking red for a few seconds, and then the backlight turns on (but the screen remains black) and you can hear a faint high pitched whine. After about a second, the lighting turns off and the whine stops. The red LED keeps blinking once or twice, then turns off altogether as if the power is away completely.

If you press the power button now, the LED turns on...

Hello!

I often buy Aishi caps, and use it in various projects (nothing computer-related) and they've worked well for me, over the years. When googling around, I can hardly find any info about people using them. How come? Are these caps really that rarely used?

Any experience with Aishi caps?

Re: LCD monitor flickering violently and randomly only after getting "stressed"

I'm sorry, I confused the names. The caps I meant were Panasonic NHG. These caps are available in 450V (also, some of them are a little cheaper than FM).

Re: LCD monitor flickering violently and randomly only after getting "stressed"

No, it seems to get worse the longer it is on. Basically just becoming a white screen with the occasional thick lines showing up in random places.

The voltage info was interesting. I am aware of peak, RMS voltage and such, but the PFC bit was new to me.

Panasonic FR... I have only seen FRG. Is this the same series? The FRG caps are cheaper (when available), maybe I'll go with those instead.

Re: LCD monitor flickering violently and randomly only after getting "stressed"

Hi again,

I spoke too soon. I said it works for web browsing, etc, but that is no longer the case. After last night, it is completely unusable. Now all I get are various lines changing about, and sometimes a short flicker of what is supposed to be on the screen.

Why is the cap rated at 450 volts? Are there voltages close to this being used, or is it just a "precaution"?

As for the model of the monitor: LG W43 series. 22".

I...

Re: LCD monitor flickering violently and randomly only after getting "stressed"

Thank you for your replies.

selldoor- I will provide more info later, I am not at home right now and do not have everything available. But I live in 230V country. It's an LG monitor. That's all I remember.

The black causing problems makes sense. Most recently this happened shortly after I started playing a game. Was walking around and ended up in a dark tunnel. Only a tiny little flashlight as light source, and boom - screen turns crazy.

The...

Hello!

I have an LCD monitor from 2009. I can use it for web browsing and similar tasks that do not involve a lot of "activity" on the screen.

But when I try to play a game or watch a movie, it won't take long until the screen starts giving me totally random artifacts. It could be shadowing of the objects on the screen, they could get streched, part of the screen can turn white or black for a split second, etc. But most commonly I get various colors and lines all over the place. It's chaotic. At this point, you can not go back to web browsing or whatever....