FAQ
TL;DR: One documented fix: 1/1 RX‑V450 units in this thread revived after replacing a small capacitor; “replacement helped.” [Elektroda, ScoTTwwo, post #16781936]
Why it matters: This FAQ helps DIYers diagnose a no‑power Yamaha RX‑V450 and decide if a simple capacitor swap solves it.
Quick Facts
- Symptom: unit wouldn’t power on; earlier it needed several power-button presses, then went fully dead. [Elektroda, ScoTTwwo, post #16760745]
- Common culprit discussed: capacitor marked “223k630,” decoded as 22 nF / 630 V. [Elektroda, dybas, post #16760926]
- Tooling: a universal meter with capacitance range up to 20 μF is sufficient for checks. [Elektroda, zgzbyszek1, post #16761197]
- Service economics: quoted 200 PLN for repair plus 50 PLN verification fee. [Elektroda, ScoTTwwo, post #16760822]
- Replacement guidance: a 22 nF foil capacitor; slightly larger capacitance or voltage rating is acceptable. [Elektroda, Piotr160292, post #16760935]
How do I fix a Yamaha RX‑V450 that won’t turn on?
In this case, replacing one small capacitor restored power. The thread author confirmed, “replacement helped.” Start by locating the capacitor marked 223k630 near the power supply, desolder it, and install a new 22 nF/630 V foil type. Verify polarity is not required for film caps. Reassemble and test. If symptoms persist, continue diagnostics. [Elektroda, ScoTTwwo, post #16781936]
What does the capacitor code 223k630 mean on this receiver?
It decodes to 22,000 pF (22 nF) with a tolerance around K, and a 630 V rating. One expert summarized it plainly: “This unfortunate capacitor is 22 nF / 630 V.” Use a film/foil capacitor with at least the same voltage rating. [Elektroda, dybas, post #16760926]
Is it really the capacitors, or should I test first?
Test first. A contributor cautioned that replacing parts blindly can waste time and money. Quote: “Need to measure… otherwise you can throw half the power supply out of the box and nothing will come of it.” Check capacitance and signs of leakage before ordering parts. [Elektroda, Piotr160292, post #16760776]
What meter do I need to check that 223k630 capacitor?
Use a universal multimeter with a capacitance range up to 20 μF. Desolder one lead (preferably remove the part) and measure. A good 22 nF capacitor should read near its nominal value, with about +15% tolerance considered acceptable. [Elektroda, zgzbyszek1, post #16761197]
Where is the failure located when both the power button and remote don’t start the unit?
The thread points to the power supply section. The author noted the front switch and remote could not start the receiver, which aligns with a standby or primary supply fault. Inspect and test the 223k630 capacitor found near the supply. [Elektroda, ScoTTwwo, post #16760822]
Can I use a slightly larger capacitance or higher voltage rating?
Yes. Advice given: ask for a “22 nano foil,” and using a slightly larger capacitance or higher voltage rating is fine. The key is a quality film capacitor and equal or higher voltage. “The cost is ridiculous,” so buy a couple spares. [Elektroda, Piotr160292, post #16760935]
What are the typical symptoms before total failure?
Early on, the receiver could be forced on by pressing the power button multiple times. Eventually it stopped turning on at all. This progression suggests a degrading component in the power path, consistent with a failing capacitor. [Elektroda, ScoTTwwo, post #16760745]
How much might a shop charge versus DIY?
In this case, a shop quoted 200 PLN for repair and charged 50 PLN for verification when the owner declined. DIY replacement of a single film capacitor costs far less and fixed the unit here. [Elektroda, ScoTTwwo, post #16760822]
What is a foil (film) capacitor in this context?
It’s a plastic-film dielectric capacitor often used in power supply timing, snubbing, or filtering. The advice here is to replace the 223k630 with a film unit of 22 nF and equal or higher voltage. Ask for a “22 nF foil” at the counter. [Elektroda, Piotr160292, post #16760857]
What quick checks should I do before ordering parts?
Visually inspect for cracks, scorching, or bulging. Desolder and measure the suspect capacitor’s value. Confirm the mains cable and power switch are OK. The original poster reported the cable and switch were fine, shifting focus to the power supply. [Elektroda, ScoTTwwo, post #16760822]
Do I need to match the exact 223k630 brand or suffix (e.g., “DI”)?
No. Match the electrical specs: 22 nF capacitance and 630 V or higher rating, film type. The code and brand suffix vary by manufacturer and are not critical for function in this repair. [Elektroda, dybas, post #16760926]
Can a failed 22 nF capacitor really immobilize the amplifier?
Yes. One contributor stated there’s “a very good chance that this capacitor immobilized the amplifier,” citing similar past cases. Small film caps in the supply can stop standby startup when they drift or open. [Elektroda, Piotr160292, post #16760839]
How do I test and replace the suspect capacitor? (3 steps)
- Desolder the capacitor marked 223k630 from the power-supply area.
- Measure capacitance with a meter up to 20 μF; compare to 22 nF with about +15% tolerance.
- If out of spec, install a new 22 nF/630 V film capacitor and retest power-on.
[Elektroda, zgzbyszek1, post #16761197]
What if replacing the 22 nF cap doesn’t fix my unit?
Continue systematic diagnostics. As one expert warned, “Need to measure,” or you risk needless part swaps. Check other supply components and voltages. If you’re stuck, a shop may still be cost-effective compared to random replacements. [Elektroda, Piotr160292, post #16760776]
Any real-world confirmation that this specific swap works?
Yes. The thread owner returned after trying the swap: “Subject to close, condenser replacement helped.” That is a 100% success in this sample (1 of 1). [Elektroda, ScoTTwwo, post #16781936]
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