Code yamaha receiver rx-v1200 - Logitech Harmony 550 Remote Control

replace the switch

check ur speaker wires, try disconnect all wires from back of unit and then try to turn on unit .if it stays on whit no wires attached than u have short connection at speaker wires . if doesn`t come on then try to fasten screws at back of the unit , may sound like BS but if amp board don`t have good ground connection it can go in protection mode
happened to me on RX-V592

I would get it assessed to see if the unit is worth repairing. There are Ic's and stand alone transistors that could add up when it comes to repairs.

Hello
This is the picture of the power cord you have to buy. It can be bought either form the authorised service ceter for Yamaha or from any local electronic sparepart selling shops at your town. OK.

The EQ (ore any similar analog processor) would customarily be connected as if it was a tape deck.

Kepp this in mind: Ins always go to Outs.

If you have the manual, Page 17 shows the analog connections for a CD Recorder going to/from the MD/Tape In and Out jacks. You could also use the CD-R, VCR-1 or VCR-2 jacks.

Attach any actual analog recorders to the corresponding jacks on the EQ using the same In-to-Out pattern.

What happens when you turn it back on?? Are there any messages on the display??

if you are not really that technical type that can make repairs then it will be very hard for you to replace it yourself. not hard to find the volume control, it is mounted on a board. you dismantle the board first then remove desolder the volume control. it think you can onyl get the parts from yamaha service.

if you know how to repair, then replace the volume control switch. it is a digital type/mechanical type of switch with silicone oil on it to prevent sudden turn of volume. if i were the repairman i can simply clean the contacts of the volume control and pour silicon oil again. but i really dont know in your area if they try to clean those.

just connect your subwoofer mono RCA to your amp sub single out rca connector. you do not need to megre all those 4terminals into one. in fact internal circuit of those 4rca are merging inside to one since the sub uses only a single amp. 4inputs was meant for sources with multiple sub out

please check your speaker cabling first for possible short connections. if all ok, then remove the speakers (all) and try to turn on the unit. If still doing the same thing then you have busted one of your amplifier. it can be any of the amplifiers (main center surround etc...