Made a noise then blanked out without sound

Hi This is most likely the inverter panel that drive the CCFL's (Backlight tubes) or the backlight tubes themselves, I'm afraid I can't help with the diagnostic test or service menu.

hope this helps
Midge.

Time to replace lamp as existing lamp is reaching to end of its working life and causing problem.
Lamp replacement procedure is easy and written in user manual.

sony 2005 kdf e60a20 tv---turns on and off every 2-3mins...green power lite stays on no blinking

Lamp replaced and problem solved.

It is symptom of weak Lamp (bulb) that requires replacement.
You can buy Sony original lamp from Sony Accessories Store.
Lamp required for KDF-42WE655 part number is as follows..
A1606034B LAMP BLOCK XL-2100U

Check and clean the cooling fan in the back.

Looked your set up and this model DOES NOT have the famous color wheel in it so if very well could be a fan, question is there are three. All differant sizes and have differant part numbers so you will have to find out which one and get back to us on its location.

optical block bad please masrk post as fixya!

2003-2004 Model Year Grand WEGA Televisions:

Models: KF-42WE610, KF-50WE610, KF-60WE610, KDF-70XBR950, KDF-60XBR950, KDF-42WE655, KDF-50WE655, KDF-55WF655, KDF-60WF655, KDF-55XS955, KDF-60XS955, KF-42WE620, and KF-50WE620.

As technology evolves, Sony continually looks to stand behind the reliability of its televisions. It has come to our attention that a very limited number of televisions manufactured between 2003-2005, after a period of time exhibit a stationary scribble / random line pattern on the screen. Click here to see photos of this symptom.

As part of our commitment to quality, Sony is announcing that for any owner of this model television who paid out-of pocket expenses on or before May 26, 2006 for an estimate or repair service to replace the optical block for this specific issue, Sony will reimburse the customer by mail for his/her parts and labor expenses. To receive reimbursement, please follow completely the directions and terms on the claim form for reimbursement; all claims must be postmarked by May 31, 2007.

In addition, for any customer who later experiences this issue on one of the affected models, Sony will cover the cost of the optical block repair at no charge through September 30, 2007. All other terms of the Sony limited warranty continue to apply.

There is more than one flourescent tube in your TV, It could be possible that one after the other has failed, these should usually last a few years depending on usage.

If it is not the tubes then there may be a fault in the backlight inverter although this would more likely show up as a sudden failure.

How old is your TV?

The little flashing light down on front of your TV will tell you the problem by the color of the light or the blinking intervals, this is the reason you can not turn it off is telling you something. The manual should have a section dedicated to this part, most likely is the bulb, the bulb is easy to access generally hold by one or tow screws you can pull it out to verify the integrity of the bulb. Then again check the LED light before anything then you go from there.