Samsung HPS4253 won't turn on all the time

As you and I don't know what the problem is, certain basics have to be first covered. Here is a link describing basics for any TV.

TV Power Light Comes On But No Picture Or Sound

As I don't know if you have an active led power light, here are a couple of videos:

EASY HOW TO FIX SAMSUNG TV NO POWER

Samsung TV Won Turn On How to Repair Bulging Capacitor for Clicking Noise

Samsung TV Won Turn On Has No Power No Standby Light Samsung LCD TV...

If the set is powered up, you can try resetting it to factory defaults. Yes, any of these suggestions may not work but one of them might fix your problem. You might try searching for tips by including the model number in the search. Bear in mind you are dealing with a high voltage device and your next repair may be at the hospital if you are not exceptionally careful.

The main board would be susoect next if the power supply has already been replaced.

3 blinks indicates lamp door is not on or has not been reinstalled properly. This also could mean the lamp door switch has failed itself. Try removing the lamp door and putting back on, if that doesnt correct the problem then I recommend having the switch replaced.

Hi,
TV needs lamp replacement as existing lamp got weak or has been reached to end of its working life, please note that lamp is not dead or broken so that is why lamp lit is not lit at tv front.
Hope these info will help you.
Thanks.

Now tv turn on.Hear alots of clicking or squiling,loud motor noises turn on?Alot of clicking,the Ballast board it dead,this board help ignite the projection lamp.Tv also have a colors wheels.The colors wheel is dead,if hear squiling noises,loud motor noises.

go to turn tv on,hear a poping noise,once then tv standby lite blinks 3 times repeatily but no picture or audio.can you help me out with this thank you

here's your answer probably not what you wanted to hear...
https://www.dell.com/community/Monitors/Monitor-Won-t-turn-on-Blinking-Green-Light/m-p/2558319

Your color wheel needs to be changed. Mine just did the same thing. I changed mine, and the buzzing sound went away, however now my picture washes out with light or yellow colors. The darks look green and purple also.

There are several capacitors that are known, in Samsung TV's that go out.. ( I replaced mine until the board was burnt through.. bought a new board, they went out again.. BOUGHT A LG TV!!)
Samsung settlement warrants older TVs with faulty capacitors

Samsung LCD Plasma TV Capacitor Repair Kit Replacement Parts

replacing these is not hard at all.. if you can use a soldering iron, you can do it..it just takes time..

Repair Samsung LCD TV Relay Clicks Shuts Off Won Come On

WATCH THESE VIDEOS FIRST.

Samsung TV Won Turn On How to Repair Bulging Capacitor for Clicking Noise

My Repair of 46 Samsung LCD TV with Bad Capacitors

HLS4266W 43" dlp. In less than 1 yr whining grew worse, but did know what it was. Year passed with warranty and lamp went out. Replaced lamp. Worked for 3.5 hrs. Turned on next day and did not work. Got another lamp, but did not work. Figured out might be color wheel. Replaced it too. TV started up. Watched that night. Turned on next day, heard loud pop. Lamp never came on. Withdrew and reinstalled lamp a couple times to see if that worked. Did not. Currently, with new lamp and color wheel installed, lamp light blinks, but no lamp comes on. What now?