Hisense lcd40v57ca 120Hz Ripple

[kodiac]

I have 2 horizontal transparent lines rolling up a Hisense lcd40v57ca TV screen.
Could this be 120Hz Ripple from bad caps in the power supply?

Thank You.

[budm]

Re: Hisense lcd40v57ca 120Hz Ripple

I would suspect bad filter caps in the power supply, and in the main board, try heating the caps with hair dryer to see if it gets better.

[tom66]

Re: Hisense lcd40v57ca 120Hz Ripple

Someone else here had a Hisense LCD with a bad main filter cap but they did have different symptoms.

[PL519]

Re: Hisense lcd40v57ca 120Hz Ripple

Hi,
with 99.9% probability it´s the mains filter cap, since in switching power supplies you only find 60/120Hz on the primary side of the supply. Had the same issue with my satellite receiver, two lines on the screen, sometimes rolling upwards, sometimes downwards. Mains filter cap was totally dried out (not bulged!), no capacity anymore. Replacement should have same or more capacitance, same or higher voltage range, it´s a good idea to take one with higher temp range (105°) for a longer life.
Greetings,
Wolf

[kodiac]

Re: Hisense lcd40v57ca 120Hz Ripple

Thank You