I have a hisense 40k360m is it edge lit or back lit

My first thoughts are to recycle the TV and buy another as this model was plagued with problems. But if you want to fix it you will need some voltage measurements, the 5 volt standy is good since you have standy lamp, the 1st voltage reading would be on the power board connector going to the main board, look for a terminal marked ps-on, pwr, pr, or something that starts with a p, turn the set on at the tv or remote and look for 3 vdc there, if you don't see it replace the main, if you do message me back and I'll get you more info on what to test next but I don't you will find this voltage.

Replace the backlight lamps.

Hi Drew..Your backlights are bad, common issue, there are some shorted diodes in the lamp strips, the over current section of the inverter is shutting down, then the set reboots, senses over current and shuts down again ect

Hisense TV forgot password
The easiest first step to unlock your HISENSE H65U7A password is to call back, or send a message to the former owner. However, he or she may have forgotten it! In that case, do not get upset. The default codes are 0000, 1234, 1111, 7777 or 9999.May 23, 2018

How to unlock your HISENSE H65U7A - TV Info - Brain Start

tv.brain-start.net > HISENSE Search for: Hisense TV forgot password

Or Factory Reset

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I would inspect the power board for mushroomed caps and brunt traces. A edge lit led screen has two ribbon cables coming from the power supply, I would unplug one at a time to see if one side lights up. Both led strips rarely go bad at the small time. The problem is most likely in the power supply.

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hi is there a backlight, look through the vents at the back of the tv see if the backlight is lit if not, you may inverter board problem,

shaun

hi look through the vents at the back of the tv, to see if the backlight is lit, if it's not, it could be a inverter board, could be the fuse on the tcon board, or it could be power supply fault, thanks

shaun

that would be the part that runs your hdmi and rca video is bad replace and u should be fine tx

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Disassemble procedure to many popular brand TVs and other devices are given in detail with illustrations.