Symptoms were following - after turning on tuner shows "Initializing..." on grey background on TV screen. After a moment screen goes black and no picture anymore. Next idea after checking power supply output voltages inside of device was trying to update firmware. Unfortunately that is quite an old model and I was not able to find an firmware file. But I was lucky trying contacting support at https://www.elpa.lt/ I described the problem and after requesting serial number of my tuner they sent me "dh-update.ud" file. Flash needs to be formatted (I chose FAT16 to be sure), copied update file to it. And than with USB Flash drive connected turned on the tuner. And magic happened, LED indicator started to blink indicated different update stages. It took maybe 3 minutes and now tuner is alive again.
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