My 55k20dg hisense tv had acrackling noise and a little smoke came out of top back now nothing happens when i turn power on

SOURCE: light colored smoke comes from top of TV when first turned on

If it's like my problem with this set, the power supply gets really hot and essentially melts all of the contact cement they smear all over the PCB to keep things from coming loose. That didn't affect the set's performance and ceased after just the first few minutes out of the box. But recently, we had the same thing happen and I found that all four of 3300uf caps on the board had cooked-off, All of them were swelled and two of them had sprayed their liquid contents around their enclosure, creating the smoke.
I replaced all four of those, but the set will still not power up. I'm getting 120vac all over the "Hot" side of the board and nothing on the "Cold" side. How do I test the three PC817 optocouplers that separate the two sides of the board?

SOURCE: I recieved a civic video

Hi hullman37, I had the same problem but contacted Hisense who immediately sorted it out for me. Their number is 1800 639 604.

SOURCE: Hisense H32V77C LCD tv will not turn on

There is an internal fault inside the tv, it could be the power supply or one of the other control boards but i would suggest getting it professionally looked at.

The Knight

• 76851 Answers
• Posted on Oct 30, 2015

SOURCE: My TV has power on the main board but won't turn on. When I plug it in the speaker pops but then nothing happens after that. Nothing looks bad on it. It's a 50" hisense model # 50K23DG

Fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

SOURCE: I have a Hisense 55K20DG 2013 MODEL and recently the picture went black/white and very dim with the sound still intact. After a few days the picture went out completely with no logo.still have sound

Throw it away. Seriously most of the parts will wind up costing more than a replacement set...and you are taking a chance that they will even fix it. Hisense has a poor reputation for customer service and does not make service info readily available. If you do decide to try and repair it....yu probably need at minimum an led driver board...assuming the led is not bad.