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Electronics => Repair => Topic started by: nevillet on August 04, 2019, 09:44:40 am

Title: Toshiba 55U5766DB LED TV switches off after approx 10 seconds
Post by: nevillet on August 04, 2019, 09:44:40 am
Hi All,

I am trying to repair a friends TV which switches off after about 10 seconds.  I thought the problem might be the Vestel 17IPS72 PSU board and i've checked all the electrolytics and the diodes.  All are fine.

The Vestel logic board is a 17MB120.

Any pointers would be most welcome.

Thanks
Title: Re: Toshiba 55U5766DB LED TV switches off after approx 10 seconds
Post by: m3vuv on August 05, 2019, 10:11:36 am
i would start by checking the psu outputs firstly,ie see if they all vanish when it turns off.
Title: Re: Toshiba 55U5766DB LED TV switches off after approx 10 seconds
Post by: nevillet on August 05, 2019, 05:41:46 pm
Thanks M3VUV,

It turns out that the psu board is OK.

I've figured out a work around to make it work:  After switching on you select an external source, like a video file on a USB stick. Once it is playing you can return to the TV tuner and it continues to work fine.  You have to repeat the process after switching off/on.

A bug in the firmware perhaps?  No updates are available on the Tosh site.  From new in 2017 it was fine and has only developed the issue over the last few weeks.
Title: Re: Toshiba 55U5766DB LED TV switches off after approx 10 seconds
Post by: m3vuv on August 13, 2019, 05:34:00 am
certainly an odd ball fault!