Sony Trinitron Model KU-27TW77 Manuf. date 11/93

Hello,
what is the model of your tv?Look on the back of your tv...

Yes.... u must adjust the screen voltage going to picture tube....located on the CRT module>>>little board connected directly to picture tube (take back off TV and you will see ) play around with screen control on the CRT module......can be adjusted at times to keep from losing picture!!! tube is bad...i know sure looks good when showing a picture....TRY adjusting screen voltage ( YES while TV is ON>>>CAREFULL ) gl

There is about 2 or 3 things Lamp, Lamp Fan if Fan stops runinng then TV will shut off to protect Lamp and the Ballast Board is what turns Lamp on.Go to this website online Encompass Parts type in your Model number which is KDF60XS955 They list everything you need Service manual you can download for FREE These are the part number for (Lamp- A-1085-447-A) & (Ballast Board 1-468-875-11) Call them at 1-800-638-3328

needs screen adjustment. knob located on flyback transformer

may just need a hv screen adjustment

as you say that u purchased new tv so it must be in warrenty period u hav eno need to do any experiment on it because shopkeepar can say done a mistake . so just make a call to the shopkeepar it will defenetaly solve your problem.

sorry but u have a bad picture tube , time for a new tv

Hi, IK circuit is engaging which basically means the picture tube is getting tired, the only "fix" is temporary (may get another year out of it). You have to increase the "screen control clockwise".
Remove back of set, follow large black or red wire attatched to picture tube down to the flyback transformer, mounted on flyback are two black controls, one is focus (leave it alone) the other is "screen", adjust it clockwise approx. 1/4 inch, remember that this is a high voltage circuit so use one hand in the set the other hand out of the set at all times,any questions ? e-mail me back, good luck, BMW Rider

The screen control inside the set may be on the highvoltage transformer or on the crt socket; either way if you can turn it up just a little clockwise and the picture comes up but doesn't look good you are likely to have a bad tube. Or try tapping lightly on the glass neck and watch the picture as you tap. If it reacts to the tap you have a bad tube. but the turning the screen control is the best test. Turn it the other way the picture goes off immediately. bad tube: too costly if it is available.

This is a simple and common problem. The solder joints on the vertical output IC have cracked loose. I actually did a housecall on the exact same set with the exact same symptoms this morning! A good tech will resolder the pins of the vertical output IC and all other major solder joints on the main board and the set will play fine.