Lcd tv power supply producing a high pitched and static noise. No picture but sound.

[efan]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

fuses as shown in picture

[retiredcaps]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

B+ of 36 Volt seems very high.

Agreed.

@funtastic, you want to measure DC voltage with your black probe on either a ground screw on the t-con or chassis.

[funtastic]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

Hi There,

I've tested all four of the white fuses and they are fine, and tested other components, and the caps. Everything is receiving around 36v. The black fuse is the one that has blown.

Shall I buy the same fuse as on this thread? https://www.badcaps.net/forum/showthread.php?t=17214. Seems like the same fuse.

Do you think 36v is to high? What would cause a higher output?

One other thing is that the fan above the power supply isn't working. I checked the connector and it's not receiving power, or is it one that switches on when it gets to a certain temp?


Thanks all for the help.

[budm]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

I expect that black fuse to be bad, very common on this CMO board. I use through hole PICOII fuse by just bending the legs. One end of the fuse is connected to the 24V input, you can just trace another end to the solder pad that the other end of the fuse is connected to. You should verify you meter first with know good batteries such as car batteries.

[funtastic]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

Thanks for that. I replaced the multimeter battery and it's now 24v.

Could you please link me to the fuse to get on Digikey please? The label of this fuse is F 1A/76v.

[funtastic]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

Will this be fine? http://www.ebay.com/itm/10pcs-Littel...item5d35fbb91e

Would like an answer please to my previous question about the fan.

Thanks

[funtastic]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

Anybody?

[funtastic]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

With the PICO Fuse is there a positive and negative or can it be put on any way?

[budm]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

There is no polarity in the fuse. That one on EBAY is the type I use. I get my from Mouser, but Digikey also sell them.
http://s807.photobucket.com/albums/y...%20Littlefuse/

What is the smallest value resistor in 1/4 w size you have? If you have anything less than 1 Ohm, you can use that for testing for now. Not sure about the fan.

[funtastic]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

Hi All,

I replaced the fuse and the back light flicks on for a second and then turns off again but the picture and sound are still on.

What else could be wrong?

[tom66]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

One of the transformers or bulbs could be faulty.
Do the transformers have a part code on them?

[funtastic]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

Hi All,

Thanks for every ones help . Turns out that I forgot to plug in a tiny connector on the inverter and now everything works like new.


Thanks

[funtastic]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

Hi, the fan connector isn't receiving power and was wondering if it was possible to connect the wires up to somewhere else on the circuit boards?

The connector is the one at the top right of pic.

[budm]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

Did the fan always run before the TV broke down? May be it is on only when the sensor senses too much heat?

[funtastic]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

Hi, I bought it with it not working. I thought that too so I left it going for 2 hours and it felt quite hot and still the fan hadn't come on so I'm unsure whether it wasn't hot enough or there's something wrong. Maybe I should leave it going for longer and see what happens.

If it still doesn't come on is there a place that I could wire it in? strip two of the wires of the ones connecting to that board?


Thanks

[budm]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

Does the FAN has two wires or 3 wires? Voltage and current rating on the Fan?

[funtastic]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

3 wires but the third is just the speed reading correct? 12V and 0.09A

[funtastic]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

Not sure if you need these reading but thought I'd list them.

Top left connector

1. 12.39
2. 0.00
3. 0.00
4. 0.00
5. 15.21
6. 0.00
7. 6.18

Next connector down

1. 0.00
2. 11.11
3. 0.00
4. 5.00
5. 0.00
6. 1.74
7. 0.00
8. 3.27
9. 0.00
10. 5.00
11. 0.00
12. 0.00
13. 4.87
14. 4.87

[funtastic]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

Don't worry about it now I connected the fan to the first connector onto the first two pins and it's working great.


Thanks

[budm]

Re: Lcd tv power supply producing a high pitched and static noise. No picture but sou

Glad it works out, failed TV due to 50 cent fuse on the inverter board.