Electronics > Repair
Yamaha RX-V473 repair. PS3 PRT: 094L [SOLVED]
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Comp_Sci_hater:
So i found the problem, but i still need to figure out why the 3.3M voltage is at 5.43V. I attached a picture of the MAIN_4 board that the 3.3M rail comes from. I would appreciate any help with figuring out which component is failing. I am a total noob so i have no idea what all the circuits related to the 3.3M rail do. Thanks in advance guys!
Comp_Sci_hater:
I measured all elements on the board, except for the transoptor cause im not sure what i would need to measure. For the transistors i put my multimeter on diode mode and measured across base -> collector and base -> emitter, im not sure if thats how you do it but yeah... Resistor R3009 is supposed to be 100k ohms but im reading 9,1k ohms, 9.1% of its marked value, i suppose that somehow messes up the whole circuit? Like i mentioned i have no idea what this circuit does. Im going to order a new resistor thats for sure.
Check picture for full measurments. Blue on diodes means okay, green on resistors/caps means okay.
Let me know if this damaged resistor could make the 3.3V rail sit at 5.43V.
David_AVD:
The 3.3M voltage comes from another board, not the one in your last post.
Comp_Sci_hater:
OPERATION_2? You can check on previous screenshots that i posted in here.
David_AVD:
A search for 3.3M in the service manual shows (block diagram on page 75) that it comes from IC25 which is on the digital board. That's the top board with HDMI sockets (page 76). Look next to the factory service connector in the middle of that board, near the front edge.
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