Sony Trinitron KV-28LS36U no sound or picture, the standby light flashing green and red but if i switch it on a little bit of sound comes and then switches off. how can i repair?

1. the lamp may need to be replaced .
2 chk if the door for lamp replacing the lamp is well shot, if not tv will not start.

the number of red light flashes indicate where the fault lies...sony error codes are easy enough to find if you google the model with the number of flashes.hope this helps somewhat as you dont say how many blinks!!
regards,steve.
ps.line output transformer failure rates are quite high on these sets,usually resulting in two red blinks-pause-two red blinks-pause etc...

If your set is the KV-24FS120, then the standby light should blink with a repeated pattern. Count the blinks and post that number here. It is a diagnostic code that will indicate the defective circuit. Having that information will allow us to suggest repair options.

Thanks,
Dan

Hi
In sony tv`s the 4 blink code(sony error codes)usually means that there is a vertical deflection problem.
It is often caused by a faulty vertical output i.c and/or related components. If you feel handy with a soldering iron let me know and i`ll help you with it.
Hope this help Merry Christmas

My Sony trinitron has the stero lite on steady and standby lite flashes four times then pauses and repeats. Can you tell me the circuit/condition causing the set to not turn on.

Sony Trinitron TV. Worked well last evening. Now picture won't go on. When power is turned on, standby/timer red light flashes, but picture or sound does not work.

this problem is in the power supply.the red lights indicate as the standby mode.

i think your tv had a lose contact or crack on board

How many times this light flases in TV?