As a first step, try using a [https://www.target.com/p/uber-laser-lens-cleaner-blu-ray-dvd-and-cd-cleaner/-/A-10690717|lens cleaning disc - example only] to see if that resolves the problem
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=== Update (05/11/2018) ===
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Hi @nizora,
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Here is a link to the [https://elektrotanya.com/sony_cdp-xa5es.pdf/download.html|service manual] for your player.
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To download the manual when the sentence below the Document preview box changes from ''This file is downloadable free of charge: ...processing...'' to ''This file is downloadable free of charge: Get Manual'', click on the ''Get Manual'', as this is the download link. Be patient, as it takes a little while to find the file.
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In it there is information on how to disassemble the player, circuit diagrams and the parts list.
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Unfortunately that is all I can offer now as the player will need to be opened and the problem diagnosed as to what the fault may be.
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Contact a reputable, professional audio electronics repair service and ask for a quote.
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At least you can offer a link to the service manual if they say they don't normally repair your model
Hi @nizora ,
As a first step, try using a [https://www.target.com/p/uber-laser-lens-cleaner-blu-ray-dvd-and-cd-cleaner/-/A-10690717|lens cleaning disc - example only] to see if that resolves the problem