What is problem with TV described in detail?

get it fixed, call a service tech or take it in to a shop.
NO model TV stated at all just TV (HP)
HP LD5511 55"(this?) or some old plasma TV? what model is it , thanks.
on the rear is a tag that tag shows the model
first is age, how old is it and models tell me that.
the early LCD TV have back lamp that go out.
is sound dead, too? if yes, the TV has a bad internal power supply.
if sounds good but screen is dead, (use a flashlight pointed at the screen see video now (weak sure) but if seen that tells you the back lamps are burned out. (did TV screen run hot for many years )
yes, those are the ones that burn out.

here is the model prefix letter decode rules on HP TV.

• PE or PL = Plasma TV
• LC = LCD TV
• LT = Professional Flat Panel LCD TVs
• SL = MediaSmart LCD TV
• MD or ID = Rear Projection Microdisplay TV

as you can see TV means Little. lacking full model numbers.

You have a shorted out printed circuit board (PCB)

Please let me know whats the model number of the tv so that I can tell you what the PCB LED diagnostics are pointing to. It sounds like a power supply or Main board issue so I would like to confirm which one of them it is.

Does the backlight come on? or even flash on and off when the TV is switched on? I presume the standby light is showing 'blue' then. Do you have any sound? Also, when the TV remote is pressed, does the standby light flicker?

If its Sony KDF-42WE655 TV then it has self diagnostic feature and if it gets any problem inside, its red light will start blinking in specific numbers to show an error code.
Let me know how many times its red standby light blinking between 3 seconds interval.

You have a defective Blue CRT ( picture tube) I don't believe they are available any longer.

The power supply will need to be replace or repair if the LCD failed to switch to the blue light.
I repair these power supplies.
Let me know if you need further assistance.

i think your capacitor is blown, do a google search for insignia, lcd, capacitor...
you can buy another one for about $2 but its a pain to install, you can also instead buy a new powerboard for about $80, its an east install and you wont blow more capacitors
bestbuy.partssearch.com

I own a Sony T.V. model #KV36HS510, Serial # 9024184,Event# E36002407 and it"s aTrinitron brand name. Like the problems before no picture or sound, stand by light on front of unit flashes. When trying to turn it back on you can hear the power click, like it wants to turn on, but does not.

I have the same issue...help!