Hisense 50K360G

[dbier63]

I am working on a Hisense 50" LED. Backlight comes on but no picture or sound. Upon pressing the power on the unit blinks 7 times pauses then blinks 3 times before energizing the backlight.
I have done some troubleshooting on the PS board. All voltages there seem to be right. What is puzzling me is that when I disconnect the ribbon cable from the right side of the TCON board the left side half of the screen comes on and I can see the word video at the bottom. Also as I press the imput or menu button nothing happens.

Thanks in advance
Dan B

[budm]

Re: Hisense 50K360G

Pictures of the whole back side of the TV to show all the boards?
If you can disconnect one of the cables between the T-CON and the LCD panel ans then you can see the picture on half of the screen, that means you have bad panel problem.

[Tech 57]

Re: Hisense 50K360G

Try this go to the address boards there are smd caps see if any of them are shorted. you might get lucky

[dbier63]

Re: Hisense 50K360G

Thanks Bud, here are the pictures

[dbier63]

Re: Hisense 50K360G

Sorry don't understand address boards? smd caps?

[dbier63]

Re: Hisense 50K360G

Ok check the surface mount caps. Ok but the address boards? do you mean the main board?

Thanks.

[budm]

Re: Hisense 50K360G

I believe he is referring to those two boards where the two flay ribbon cable with silver tapes on them, you can see one board on the right, the left one is hard to see. Both boards are on the rim of the panel, they do have some SMD caps on them, but you need to take the panel apart to see the whole board. It can be shorted caps or shorted TFT driver ICs which on the the flexible PCB which you cannot see until you take the panel apart.
https://www.badcaps.net/forum/attach...1&d=1438652961

[dbier63]

Re: Hisense 50K360G

Thanks I did start to take the one on the right apart to investigate. but wasn't sure how far to go. I will take it out today and check. Do you think I need to check both or just the one on the half that isn't working?

[dbier63]

Re: Hisense 50K360G

Also it appaers that the ribbons that go to the panel are soldered to that board and not removable. I assume they connect to the panel underneath somehow.

[dbier63]

Re: Hisense 50K360G

Also if you notice the small IC on the lower right corner of the tcon....This chip was blown on the previous board so I replaced that board. Maybe the address board in question does have a bad component which is why the IC burnt to begin with.

[dbier63]

Re: Hisense 50K360G

Sorry chip number 12NN

[dbier63]

Re: Hisense 50K360G

Do you think maybe the chip went bad because of a problem with the main board?

[dbier63]

Re: Hisense 50K360G

Replaced the tcon and measured 12.68 vdc at the input to the board. Still only have half a picture with the right side ribbon removed. Also nothing happens when the menu,input, channel or sound buttons are pressed. The only button that does anything is the on off button. So I'm thinking the problem may be the main board. Although I'd really like to see a schematic for the board as I would be able to follow the current path. Any imput would be greatly appreciated.

Thanks

[budm]

Re: Hisense 50K360G

I will say this , if you put BOTH cables back in and leave the TV on long enough you will probably burn out your new T-CON board.
No functions of some of the button is not related to having only half of the screen working.

[dbier63]

Re: Hisense 50K360G

Right, which is why I haven't done that. I have ordered a new main so we'll see how that works.

[ecking767]

Re: Hisense 50K360G

I had this model Hisense, and the LCD screen was bad. I would do an screen inspection by removing the TV front bezel and then all four metal brackets around the LCD screen. check for small cracks and burn marks

[lookimback]

Re: Hisense 50K360G

I have one of these which won't power on, no turn on signal from the main, but even if I manually turn on the PSU, I still don't get backlights. PFC comes on, 380+ volts, and I get 144v to each pair of LED outputs, but no backlights.

dbier63, would you be able to tell me what voltage you get to your LEDs? Thanks.

[dbier63]

Re: Hisense 50K360G

Thanks I'll check for the burns and cracking.
Also I will measure those voltages to the LEDs and post tomorrow.

[lookimback]

Re: Hisense 50K360G

Thanks I'll check for the burns and cracking.
Also I will measure those voltages to the LEDs and post tomorrow.

Thank you.

[whatusername]

Re: Hisense 50K360G

Thanks I'll check for the burns and cracking.
Also I will measure those voltages to the LEDs and post tomorrow.

how about u just send me the whole tv? i have one with a cracked screen and need a screen lol