all my v channels are ok but i get 'no signal' for all the h channels.
how to fix this?

If using a Legacy LNB, and have receiver LNB type incorrectly set for "OCS/DP" - you will not receive "Horizontal polarity" AKA "Even" Numbered Transponders.
If using a DishPro LNB, and have receiver LNB type incorrectly set for "Standard" - you will not receive "Horizontal polarity" AKA "Even" Numbered Transponders.

If you change the LNB type in your receiver satellite setup, you MUST re-scan.

TESTING;
If receiving Dish ES 8/10 (110) goto SID channel 100 (HOME) (12326,H), If it works your LNB type is set correctly.
If receiving Bev Nimiq 1/3 (91) goto SID channel 0994 (TESTN) (12618,H), If it works your LNB type is set correctly.

Still bad; Connect direct, receiver to dish (bypass any external switch). Peak the dish and re-scan, repeat for all dishes, reconnect the switch. If still bad, replace the switch or try another switch port. Write down your active satellite(s) setups from the receiver satellites setup screen. Do a Factory reset, reload the factory .bin then the current .bin, re-set up your satellites in the receiver, re-scan the satellites.

Vertical , ODD Transponders, Right Polarity --- Legacy 12.5 to 14.5V, --- DishPro frequency is 950 to 1450 Mhz (Legacy default)
Horizontal, EVEN Transponders, Left polarity --- Legacy 15.5 to 18.0 V, --- DishPro frequency is 1650 to 2150 Mhz (Frequency Shifted up)

174 work great all's tester's group thanks god bless you