🔴 Kenwood KRF-V5560D Home Theatre Amp Repair

🔴 Kenwood KRF-V5560D Home Theatre Amp Repair - No.1127

Рет қаралды 6,054

Күн бұрын

Kenwood KRF-V5560D Home Theatre Amp Repair
I take apart my Kenwood KRF-V5560D Home Theatre Amp and do some repairs to it, to fix a problem with sound cutting out after it warms up.
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Пікірлер: 23

@hectorpascal Жыл бұрын

Interesting "straight in" visual approach to the task... Personally, before looking hard at the wiring side, I always like to spend a little time wiggling boards and connectors with the unit under power, to try to identify any areas that have connection problems. A few sharp taps can often locate areas to concentrate visual inspection on!

@ricksampson6780 Жыл бұрын

I have also observed leaking electrolyte corroding component terminals and PCB traces. Most common on PC motherboards, not to mention the BIOS button cells dissolving into a caustic quagmire.

@canadavey Жыл бұрын

I'm currently working on a Sony STR-DE575 and the build quality, parts used and board engineering are very similar to this unit you're working on. Same issues as well, dry solder joints. Definitely puts it into perspective that all these big brand manufacturers used the same assembly line back in the early 2000's.

@leybraith3561 Жыл бұрын

Ta, Informative video....but....suspenseful ending.... was the fault fixed? ....was it worse? .... Very Defpom!

@Mega_Evolution_ Жыл бұрын

Super informative and helpful! Thanks for such a nice guide video :)

@blackhorserepairs Жыл бұрын

Very impressive, thank you!

@DanielCikic 8 ай бұрын

Interesting look inside that receiver. I'm still using mine, a 5060D bought in 2001 if I remember correctly. That one got definetely more than 100 hours on it, but sadly developed a problem over the past 12 months - after a few minutes the subwoofer pre-out will start turning on/off randomly. At first I thought it was the sub but it isn't, it's the receiver. I wouldn't mind soldering what I've seen in the video... but I'll stay away from it anyways, not very used to work on AC devices like this and some of those caps do look quite pain inducing if handled incorrectly... ^^

@DanielCikic 7 ай бұрын

Finally decided to disassemble the whole thing yesterday. I think the worst part was getting the main pcb and the attached heatsink flipped without ripping any wires of and/or bending pins. And yes, there's been a few solder joints which did look very close to the ones in the video. Resoldered almost all connections on the main pcb. Also the optical input/system control pcb had broken solder joints on the tiny 2 pin wire. Carefully trying to disconnect it made the whole plug come out of the pcb with almost no resistance. I did not have as much "gooey" stuff on that capacitor, almost everything became a crusty brown powder by now. Didn't check any further, as I don't have a replacement cap at hand and that one is rather easy to get to. Thanks for the video, it likely was the reason I finally did this. And so far it did work well, no dropouts on any channel in stereo/dts/dd5.1 and no wierd relay clicking for no apparent reason (also happened from time to time, 10-15 "clicks" within 20 seconds or so). Cheers!

@simontay4851 Жыл бұрын

The processor board was obviously wave soldered. I hate wave soldering. It never solders components properly. The wave comes past then the solder just falls off again. Big power devices should always be hand soldered with the board up-side-down so the solder stays on the board with the help of gravity.

@SidneyCritic Жыл бұрын

Quality audio stuff never gets old, ie, the figures are so low that even if they improved them by an order of magnitude you would never be able to hear the difference - lol -.

@beachsidetech Жыл бұрын

Im finding that a full recap on gear is a bit over the top. I usually just recap the big power supply caps, unless something is bulging or leaking, even on 80’s gear. Maybe with the exception of smd electros…

@codebeat4192 Жыл бұрын

Dry solder joints seems to be very common with pcbs at older equipment of this century and the 90s. Pretty strange, mostly heavy equipment or equipment that gets pretty hot inside. Perhaps stress due to expansion and contraction and/or components that are too heavy? I have also seen PCBs that get very brittle over time, breaks easily or (90s->) covered with a (very) smelly thick layer of 'something' (flux residue?). Most of these problem PCBs are single layer PCBs, through hole and light brown yellowish base material with a (very) light green solder mask. I have also seen PCBs covered with dull solder joints that aren't shiny (looks like early stage of corroded aluminium). Other type of solder/bath used or production fault?

@HeyBirt Жыл бұрын

Classic problems with the 'new' lead-free solder with equipment produced at that time. No telling how many millions of tons of electronics were scrapped in the push for 'green' solder.

@codebeat4192 Жыл бұрын

That is an interesting statement, in fact at the long term 'green' produces more waste. With everything that needs to be 'green' they never tell the whole story. For example an electric car, no emmission when used but to produce a car like this and the durability, that's another story. There is a great TED-talk about this subject.

@cambridgemart2075 Жыл бұрын

Unlikely this would have been made with lead free solder 20 years ago. Decades ago, I worked in a TV repair business and we used to see the same sort of crack around power transistor legs, high power resistor leads, and on PCB mounted transformers, so it's not a new phenomena by any means.

@HeyBirt Жыл бұрын

@@cambridgemart2075 I worked at a business that produced their own PCBs (in USA) 20 years ago right as the lead free was being phased in. The XBOX 360 was released in 2005 and the infamous 'read ring of death' was due to cold solder joints on some of the ICs. Not only was the new lead free solder and flux formulations not very good then but many IC packages where not made in a lead free compatible package so trying to use a lead free production process caused problems.

@IanScottJohnston Жыл бұрын

Fair statement......but just to add I think lead free solder became a thing in 2006, when RoHS started. Heat stress is biggest cause of crack rings round component legs. I can't remember when very first lead free solder could be bought.

@HeyBirt Жыл бұрын

@@IanScottJohnston RHOS was passed by the EU in 2003 and came into effect in 2006. In 2001 my last big project where I worked at the time was installing the companies first SMT line. Companies were already phasing in lead free processes at that time. We made equipment that was considered life safety related and were exempt from needing to switch to lead free. It was a big deal even at that time as the process chemistry was just not yet developed enough. A board with as many bad solder joints across the whole (large) board such as this could be the result of an early lead free process or an issue with the wave soldering machine. It was stated in the video that the unit had not been used that much so the number of thermal cycles would be minimal and not likely as much of a factor.