Yamaha RX-V475 not working

Sir raczq . . . . .


The unit just might have found a fault . . . and it possibly only having been intermittent in nature . . . .yet, the unit had gone into auto-protect mode.

Check out that possibility by powering up and seeing if your problem still exists. If so:

Then you find INFO and TONE pushbuttons on the front panel and press them down simultaneously and hold then down and start a slow 1-10 count. At some time you should hear a relays click.

Power up the unit again and see if things are back to normal.

If not . . . .troubleshooting is ahead.


Go to . . . . . . . Then click on to mag up

http://avgear.ca/eBay Images/RXV475/RXV475_Front_LG.jpg


73’s de Edd

 

Sir raczq . . . . .

You did not quantify by how much . . . . . therefore . . . most importantly, what does the voltage output from this supply show .

Hopefully right at 5.6 VDC and without any ac ripple and it is not fluctuating up and down ?

RELEVANT REFERENCE:





73's de Edd

 

Sir raczq . . . . .

You have picked a section of the TV that is using a switch mode power supply.

It so happens that both of us are using the same schematic which shows a markup of voltage values while using 120VAC input. In Poland you are using twice that voltage input.

If you look at the bridge rectifier they are using two different part numbers relevant to the two different operating power voltages.

Also, at the C5407 main raw dc filter capacitor, over to the right you will see two different specifications in accordance to AC power input at 120 V they are using a 220uf cap at 220V while the 230 volt input is using only a 150 ufd cap but rated at 400VDC.
(The arrowed on designation of a 5K10w wire wound resistor across the main filter capacitor is just prompting you to use that item for bleeding down the supply after unplugging and getting ready to work in that section.)

You have no problems in that “hot” circuitry at the left of the central divisional dotted line.

On the right side of the circuitry, which is being line voltage isolated , by the secondary windings of the TS401 power transformer, you have the proper 5 and 3.3 volt DC supplies outputted, IF there is no appreciable ripple voltage present on them.

The systems other principal supplies are linear supplies that are using the power transformer that you are seeing been fed from your same 230VAC line up the two VHIS and CB544 supply lines over to the right.


73’s de Edd