Hi.
We have RBD53iG-5HacD2HnD and I can't find 5GHz network near router... Only 2GHz. Wifi interfaces was setup same (different only for 5GHz setting)... And If I try to scan from this MikroTik - I can't see any 5ПРя from MikroTik...
Broken 5GHz?

Yeah...or misconfigured. You make it a bit challenging coming up with a reason with the little info you provide.
Can you post:
Remove serial and any other private info.

....
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
add authentication-types=wpa2-psk group-key-update=1h mode=dynamic-keys name=\
home supplicant-identity=""
/interface wireless
set [ find default-name=wlan1 ] band=2ghz-onlyn country=russia4 disabled=no \
distance=indoors frequency=auto installation=indoor mode=ap-bridge \
security-profile=home ssid=New2GHz wireless-protocol=802.11
set [ find default-name=wlan2 ] band=5ghz-onlyac channel-width=\
20/40/80mhz-Ceee country=russia4 disabled=no distance=indoors frequency=\
auto installation=indoor mode=ap-bridge security-profile=home ssid=\
"wifi 5GHz"
....
wlan1 + wla2 in the bridge-local... no special tunings...

Because the frequency isn't set, it could take up to 10 minutes until the 5GHz radio is broadcasting.
You can set the frequency to 5180 (channel 36) manually to avoid this situation.

Does the log give any info?
At what frequency is the radio broadcasting?