Hey guys!

Unfortunately, the V4000 I got less than two months ago completely stopped reading discs last week, after sitting unused for about two weeks.

I actually bought it on eBay as a “spares/repair” unit, but after asking the seller what the exact issue was, he said that it would spin the disc and seemed to be working fine. When it arrived, it played perfectly — no issues at all — until about 3 or 4 weeks ago. That’s when it started having trouble detecting Side A on one disc. At first, I thought the disc was the problem, but then it did the same thing with another one (both of them basically scratch-free).

The weird thing was, after the player had been on for about 20 minutes, it would suddenly start reading everything perfectly again. So my first thought was: bad capacitors — once they warm up, things start working again.

But a few days ago, when I tried to play a disc, it just refused to spin at all. It detects the disc and stays on “DISC SET,” but when I press PLAY, it doesn’t start spinning or reading. It just sits there for a few seconds, then I hear the pickup moving toward the outer edge of the disc, and it gives up.

I opened it up to check if anything was jammed or stuck — everything looks fine. I even tried giving the disc a little push by hand, and one time it actually started spinning! But then I could hear the pickup struggling to read, making that classic “shshrshshshrrrsh” sound.

So yeah, I’m pretty confident — and honestly hoping — this is all capacitor-related. What do you guys think? I wasn’t really planning on doing a full teardown yet, but I guess I’ll have to.

Any idea how many capacitors I might be looking at replacing in theory? Maybe this issue already existed before I bought it, which would explain why the seller listed it as faulty, but unfortunately he couldn’t provide many details.

Thanks a lot!!

I would suspect bad capacitors too. I have a DVD player that stopped being able to spin the disc or open the disc tray, and it went back to normal when I replaced some of the capacitors in the power supply.

Thank you so much for your help! I'm just a bit worried I might have a hard time figuring out which capacitors actually need replacing, and that my only option will be to replace them all.
I use a multimeter to try to check their values, but I have to admit I’m doing it a bit blindly — I’m not entirely sure what I’m doing. Do you have any hints?

No problem! Unfortunately, you cannot reliably check the capacity of the capacitors if they are still connected to the circuit. You must remove them to get an accurate reading.

Another thing - do a visual inspection! Look for bulging capacitors. If you see any that are bulging, replace them.

Other than that, instead removing them all and testing one-by-one, the first thing that I would test is the power supply. With a multimeter connected to the output of the power supply, see if there is any voltage dip when the motor should start spin. The bulk capacitors (the big ones with large capacity) in the power supply are meant to provide energy when the motor starts. A motor which is starting needs large inrush current. If the bulk capacitors are failed, then the whole player will experience a "brownout" (supply voltage too low) when the motor tries to start.

If you are going to repair other equipment in the future, you might want to buy an ESR meter/tester. It is a device for testing electrolytic capacitors specifically (the type that fail the most often). The cool thing is, they can test many or most of those capacitors -in the circuit- without unsoldering them first. I have seen some with decent reviews for about US$100.

I will never let mine go, an analog-meter one I have had since the 1990s.

Thank you so much, guys!!
I also have a DVD player with some power issue very similar to the LD, except that the DVD detects and plays the discs normally after 2-5 minutes. It looks like it doesn’t have enough power to spin the disc at first but then I turn it on and off a couple of times and i works flawlessly. If I leave it on standby mode again, when I turn it on it will refuse again.

But all this to say I opened that DVD player up yesterday to try and figure what capacitors might need replacing and spent hours to no avail. I replaced three capacitors on the board that I suspect control the DVD drive, before I realized it migh be the power supply. But then I looked at the power supply and there is nothing that stands out. Really discouraging tbh. At least the DVD player is still working like before, didn’t damage anything.

But this kind of discourages me to open the LD and fail to detect the cause of the issue. Also, I can remove SMD capacitors quite easier now, but the other electrolytic ones I take an aweful lot of time to take them out, so the idea of replacing all of them really demoralizes me xD

You should not at all have to replace "all of" any type of capacitors in a device as new as a laser disc player. Doing that, or attempting to do so, would likely add risk of damaging circuit boards or other parts, or breaking wires attached to those boards.

I know that there is a sort of sub-set of electronic hobbyists/repairers who mainly (or only?) look at "replacing electrolytic capacitors" as a/the method of fixing things. Indeed, there are a -lot- of devices that can be fixed that way. But, none of them ever need/needed to have -all of- their electrolytics replaced (unless the device was made before maybe 1966). And a pitfall of blindly replacing capacitors hoping to "get lucky" is the chance of putting one in backward, or a wrong-value one, or damage as I mentioned above. I -thoroughly recommend- getting at least a digital multimeter if you do not have one yet, and also the service manual for your player, and measuring power-supply and maybe other voltages in the player so that you can maybe narrow down what is wrong.

I will again encourage you to buy an ESR meter. You already have two devices you want to fix. The point of using the meter is to save you from "spending hours to no avail" and getting discouraged. LD and DVD players are relatively quite complex machines; getting some general experience with more basic devices first will help you to approach "the big stuff" better. I remember my early days trying to fix things such as TV sets, without manuals or test equipment beyond a multimeter, and getting frustrated/discouraged too. This all takes practice, but it is worth it if you do want to get into technical work even as a hobby.

I do wish you much success!

Thank you so much for your encouragement and for sharing your knowledge with me! I've been practicing for a while, kind of new to soldering (began like 5 years ago but only done it very occasionally).
I do have a digital multimeter that I always use when trying to figure out whether capacitors are ok or need replacing, but I understand it isn't the best or most accurate method, and honestly I'd absolutely need some background theory or knowledge to be able to know exactly what I'm doing, you know? I really feel my lack of knowledge hinders me. I can fix some things, I have done it many times before, but I lack a lot of "tools" to help me identify what causes each problem before starting any procedure. Even if I do get service manuals I tend to struggle to understand them, you know? Upon visual inspection, if something stands out I might be able to figure stuff, but I'm quite limited.
I'm trying to practice on other equipments before opening the LD - I really don't want to mess it up.

I am glad to see that you do have an ongoing interest in repairing equipment, and that you have a multimeter and also service manuals. It does take a good amount of time and experience for things such as schematic diagrams and information in service manuals to be more understandable.

Please forgive me if I suggest any ideas that you already know or have done. Depending on how much time you can spend, and if you have space to keep or store things, you could pick up or accept old electronic devices such as portable radios, or stereo equipment or cassette tape players/recorders, and practice your soldering skills as well as attempting or doing repairs on them. Look online for electronic/PDF copies of "basic electronics" or "radio repair" books, or actual printed books if you have any libraries available near to you. I know that I learned many things by reading more than one book or discussion of a type of equipment.

No problem at all! I really appreciate all the ideas and tips you might have for me
I hadn’t thought about diving into repair books on the topic — that’s actually a great idea, thank you! I definitely feel like I need some theory and background to help me better identify components and understand how they work. I’m pretty sure that once I open up the V4000, I’ll have no idea what I’m looking at since nothing will really stand out to me.
I’d honestly be thrilled if, among all the electronics lying around here, the LD player just decided to fix itself without any intervention from me

I keep hoping for that here too, but darn it, all of my broken stuff insists that I use my soldering iron and other tools.

I actually bought a cheap-o one for about 20 bucks and it does actually work, so you can try the risk and get a cheaper one if you aren't
in the trade or on a budget.

I would have paid more for one but only used it once so far, so the 20 was just right.

If the need arises I can always buy one for 100 in the future.

Hey everyone!

It’s been a while since I first created this thread, and I finally have some updates — unfortunately, not very good ones. I’m hoping you might still have a few ideas left before I officially declare this player laser-deceased.

Since my last post, here’s what I’ve done so far:

• Full recap of the DRVB power board — no change at all.
• Partial recap of the PREB board (main laser board) — again, no change.
This board uses two bipolar capacitors that I didn’t have at first. I replaced all the other capacitors and, for testing purposes, temporarily borrowed the two bipolars from the DEMB (video/audio) board, which has identical values. I tested the player both before and after installing those donor bipolars — same behaviour in all cases.
• Partial recap of the CTCB board (the small board mounted directly behind the optical pickup). This one also has two bipolar capacitors, which I haven’t replaced yet. Still no change.

At this point, I’m honestly running out of options. I understand that ideally each capacitor should be tested individually rather than blindly replaced, but I don’t own an ESR meter and can’t afford one at the moment, so recapping directly was the only realistic option available to me.

Before concluding that the laser itself is completely worn out, my last possible attempt would be adjusting one of the potentiometers — something I’ve been trying to avoid at all costs. I know the main laser board has several pots, some related to adjustments I really don’t want to mess with (tilt, alignment, etc.). I would only consider slightly increasing the laser gain, if that’s feasible. Do you think this is a reasonable last resort? Honestly, I don’t feel like I have much left to lose at this point.

Based on all the testing I’ve done, I can confidently say that:
• The spindle motor itself is fine. It can spin the disc.
• The laser fails to lock onto the disc, so under normal conditions it doesn’t command the motor to spin up.
• If I slightly tilt the disc, the laser sometimes manages to detect that a disc is present, the motor spins up, but the laser then struggles heavily to read anything and eventually gives up. On one or two occasions it managed to identify the disc type as CLV, but most of the time it doesn’t even get that far.

I’ve invested a lot of time and effort into this repair — recapping, testing, and generally giving the machine some love — so this outcome is honestly pretty discouraging.

Any thoughts or suggestions would be greatly appreciated.

Hey guys!! Short update: my LD-V4000 is back to life!!! It’s not perfect, still have to calibrate some things, will post further details soon!