High-low whine Toshiba 37cv510

[k0nsol]

I couldn't find a single thing on this TV online. I can't get it to power on.

I pulled the back cover off and and can hear a fluctuating high- low whine coming from the highlighted area. None of the caps look bad ( i know looks can be deceiving)

I picked up this beauty for a whopping $20. I wanted to consult the experts before I replaced all the caps on the board. I'm still new at working with caps, I plan on ordering an ESR meter sometime soon.

thank you!

[budm]

Re: High-low whine Toshiba 37cv510

Those two inductors are for the PFC Voltage booster circuit, the output is filtered by that large big black cap. Do you hear the sound when the TV is just plugged in but not turn on or you hear the noise when you turn on the power switch?

[k0nsol]

Re: High-low whine Toshiba 37cv510

plugged in and not turned on.

[tom66]

Re: High-low whine Toshiba 37cv510

High-low whine may be due to varying power usage of main board in standby mode.

[k0nsol]

Re: High-low whine Toshiba 37cv510

Its a possibility. I replaced a bunch of the smaller ones, I didn't have any 35v 150uf so I replaced it with a 35v 220uf. I still have 3 35v 1000uf I couldn't find. Radioshack has them, but I know I'm supposed to stay away from them. I still can't get any response from it.

[tom66]

Re: High-low whine Toshiba 37cv510

Digikey.com or Badcaps.net store for capacitors.

[k0nsol]

Re: High-low whine Toshiba 37cv510

Do you think this sounds like a cap issue?

[tom66]

Re: High-low whine Toshiba 37cv510

No, I don't -- this power supply uses excellent capacitors.

[k0nsol]

Re: High-low whine Toshiba 37cv510

Should I replace the main board?

[tom66]

Re: High-low whine Toshiba 37cv510

Have you done any tests yet, like measure the outputs from the power supply?

[k0nsol]

Re: High-low whine Toshiba 37cv510

No sir,

I'm actually pretty new to working on LCDs. I did find one thing, The whine stops all together when I disconnect the main board from the power supply. I have a multimeter and I can measure voltage with it. Is there a FAQ or sticky to point where I should look to check?