JVC VHS VCR with a very strange video problem indeed

This had a ghosting picture on playback

[@reacey]

Binge watching your vcr repair vids ..a treasure trove of knowledge ..for free .It makes me appriciate it even more, imagining how things were back in the day, when this kind of wisdom wasnt so easy to come by.

[@alexispieltin9379]

Hello, great job once again! This TDK part is an integrated filter, and it's covered to protect fine SMD components and eventual laser cut resistors printed on the ceramic board. This kind of component is not know for failing easily, and a common technology used for decades in tuners, tonality circuits, power amps... They also evolved incorporating active components, so the fact it's only a three legs components is sufficiently indicating here a special filter. The problem of these "surprise bags" is mainly a poor documentation (most are not even showing marks or labels), and has the bad reputation of difficulties to replace if failed. In fact, most of these are also custom made for a special application, and are impossible to provide or difficult to retro engine as far as you have more than three legs! However, some classic ones are still sold by specialists like IF low pass, Baxandals and other resistor arrays. Some also manufacture licenced circuits they protect with such coating. These are ancestors of custom programmed arrays or dedicated computers, sort of "brown" bag before the "black" boxes.
The screwdriver tapping or wet finger tricks are well known easy ways for old folks, still very usefull to locate bad circuits or components. It's like the "reflex" of hand tapping or shaking the unit to check for bad solders and connections, everyone with years at the bench will try that to begin with! All these are interesting to share, but all finally require a lot of experience in maintenance and knowledge. You should mention this is of limited use or even dangerous if you don't know what you do or general knowledge about circuit use and voltages involved! Of course there is no risks of lethal high voltages in a "modern" VCR outside the power supply, here in a specific shielded unit, but you could still find some "hot spots" around fluorescent displays... I won't mention some hair raising tricks I've seen 35 years ago implying a metal fork in a vacuum tube television set.

[@12voltvids]

Even vacuum fluorescent displays the voltage is not that high. 50 volts max. Might give you a tingle on your finger but that's about it. Naturally i wouldn't be putting my fingers in a plasma tv or crt tv or tube amp. Tubes scare the crap out of me. Require undivided attention.

[@tekvax01]

@@12voltvids I was once repairing a battery operated sega genesis portable, with a little plasma screen... I got a really nasty lift from that bugger!

[@12voltvids]

@@tekvax01
That would have been an LCD screen and you got bit by the fluorescent backlight driver.

[@tekvax01]

@@12voltvids very probably - I misspoke when I said plasma... But it frankly hurt more than a shock from a live TV CRT...
if you can believe that! maybe it was just because I wasn't expecting it at all...

[@12voltvids]

@@tekvax01
Those driver modules put out about 1000 volts.

[@AvidRetro]

Thanks 12voltvids. Your VCR videos helped me fix a SVHS JVC VCR. Great job on your content showing your valuable experiences.

[@tekvax01]

Those "ICs" are called thick film hybrids. The fault looked like some sort of RF VSWR termination reflection. That would cause ghosting for sure...

[@saarike]

Excellent repair and interesting problem! My humble thanks.

[@allrock1238]

JVC. PELN0690 is custom LOW PASS FILTER (If the source is correct) I have never ran into an issue like that before either .

[@zx8401ztv]

Sorry dave, but you are just too good at repairing things :-D
The fault sort of reminded me of composite video coax impedence mismatches.
Maybe the module earth pin was floating and making an odd resonance.
Anyway it works :-D

[@38911bytefree]

TDK is well known by it capacitors, I have seen some radio videos that use blocks similar to this. It is like a passive netwrok of componnets that has been sealed for ... stability ? ... avoid moisture ? .... TDK do actually some chips, but I think they are better knonw because their caps, probably a filter network of some kind ? ... I dont know even the basics of a VCR so no idea. Interesting vid as usual

[@joey_after_midnight]

Oh boy! I LOVE weird and wacky mysteries.. this is going to be a good one.

[@GeorgeGeorge-xj2bc]

A kind of delay line,once upon a time were two delay lines with different delay times for PAL and SECAM each.Due to the size and weight of these components are prone to dry joints.

[@stevehaywood5995]

Yes, exactly, looks like a luminance delay line of some type. Had this fault many times on TV's and VCR's in the past.

[@Ted_E_Bear]

Great video today !

[@nickfrench7372]

Great how u have got that vcr working again,,,the strange looking ic was the problem,,,but great how it was only a bad,dry solder joint connection,,and now it works showing a clear picture perfectly.

[@The31262]

I've seen this before on a JVC, and a Toshiba. Its a video peaking network. took a while to find first time!

[@mrjsv4935]

Interesting fault and nice to see it was simple fix. My 2003 Philips VCR is still working after it had some image problem. I think the tape guide mechanism has some mechanical wear, as there's pretty visible marks on the metal they slide on, even there's some grease left. Perhaps that's the reason it has randomly acting up, working fine most of the time though.

[@stroise256]

Bad soldier joint. Great job fix

[@audiogear474]

Good find. I did VCR work for years and never saw that exact problem. I remember many of this type JVC chasis had problems with bottom of guideposts falling off causing other pic problems.

[@12voltvids]

Guide post falling out was a common problem with JVC and Mitsubishi VCRs and Sony / canon 8mm cameras.

[@audiogear474]

@@12voltvids Yes and NEC also if I remember correctly

[@NunYa953]

Fascinating! I'm working on a later model JVC (2002). What would cause faint and muddy sound on one channel of the audio output? It's not heads as any sound I pass through it has the same symptom. I've changed some caps, checked solder joints, and even changed the jack on the back. I cannot figure out what the hell!

[@chillidogkev]

As I think has been said it's a filter network. I've come across lots of these on Sony Betacam SP boards and they are very sensitive to bad connections. Had that self same problem. Often the ones on the Betacam boards are an absolute nightmare because the legs that come out of them to solder to the PCB are in fact soldered to a board in the actual epoxy coated thing itself. Therefore, when you apply heat to the pin going into the main. PCB, linger a second too long and the pin unsolders from the end connected to the filter. It's ridiculous! I also found when these get too warm the picture quality goes bad and some freezer spray immediately sorts it. Awful things.

[@wahyung9669]

Not funny at the time but can imagine your soldering challenge, I can hear Homer Simpson cursing in the background. I'm not in the electronic repair industry but in electrical switch boards, little vibration over time can loosen screws, the source of the vibrations are from large contactor coils hum to maniacal thumps and transformers. As you would of guessed loose screws on cables causes arcing. In an industrial switchboard it can take months to loosen something and at home it could take years to decades. Just amazed to see components glued on boards reduce or solve electro/mechanical vibration causing faults.

[@BoB4jjjjs]

I had this fault and I couldn't understand it. I would take it onto the bench and look at it for an hour and give up, put it away again. One day I prodding around and knocked one of these by accident, the fault went away, but I was not sure what I did and the fault wouldn't come back, so I put it back together and after a few hours it appeared again. I knew the area the fault was in so it tapped around it on the board, but nothing, so I started giving everything a gentle push, I had been round the board several times before I touched one of these, the fault went for just a split second, but I caught the change in the corner of my eye. Eventually fount that if I bent this thing the fault would come and go. No idea what it was or what was inside and it only had a number printed on it, so I couldn't order one either. I looked in a box of junk and found something that looked the same, no idea what it came out of either. As the machine was deemed scrap I thought nothing ventured nothing gained. It looked almost the same but there was no way of telling, the number on it didn't give much away either. As it had been to a repair shop and they told the owner that it was beyond repair I put it in anyway. It worked and the owner said it was better than it had ever been. However, he had bought a new one and didn't want to pay for a repair. I didn't even ask him for money, I just told him how long I had spent on it (Days if added up), he said "If it is any use to you just keep it" so it sat in my parents house recording programmes off the TV for them to watch later. However, when they moved house it didn't go with them, even though I saw it working a week before they moved. I didn't ask why, but I saw they had a SP/LP video ( this was just before Video players and digital TV) then when Digital TV came online even the new one vanished and was replaced by a set top digital box for TV only.

[@tony359]

A device designed to be repaired, with slots for the board to sit vertical. We have lost all of that, Sigh.

[@geraldv203]

Just for reference, sometimes in arcade games some custom hybrid "ICs" are failing and there are some techniques to remove the coating. Creating reproductions hybrid may not worth the bucks, but when come times fo preservation it can be useful to know that alternatives can be done by hobbyists. You can find an example here :
www.jammarcade.net/gals-panic-repair-log-and-kaneko-px4460-lpf6k-reproduction/

[@nickfrench7372]

Looks like as if I,'ve been drinking too much to see that picture as double image,,,lol.

[@giorgostexnikos6976]

amazing .thenks

[@swilwerth]

If I saw it correctly it says LPF (lowpass filter) on the board. I guess it have inductors and capacitors. Maybe part of the RF filtering notch to get the downconverted chroma signal without the deep recorded hifi residue. But not sure. And the sympthom was really weird.

[@12voltvids]

Open ground I think.

[@Hi-Tech-Ray]

weren't earlier Magnavox VHS VCRs made by Panasonic?

[@crashbandicoot4everr]

PELN0690 is a low-pass filter according to a website.

[@noelj62]

I think such part is called couplette.

[@speedyboishan87]

Hi I have a video tape when I play the black bars on top and bottom are fuzzy, with other tapes it's clean what could be the issue, does my heads need cleaning.

[@12voltvids]

Alignment?

[@speedyboishan87]

@@12voltvids How do I fix that what do I need to do

[@NoureddineArbaoui-p3m]

Mon chariot ne fonction pas l'éjection ?

[@fadhlematrook1248]

WHAT THE HELL THAT PROBLEMS?

[@TheVCRKing]

I think this VCR needs glasses. LOL!

[@joey_after_midnight]

I think that's a 1992 - Magnavox VR9160

[@jaceknasalski1422]

Wet finger trick - my favorite procedure :) . Very interesting problem indeed. It looks like two half frames of the interlaced picture are out of phase. That chip looks like some kind of hybrid filter. Maybe this filter delays one half frame to match the other?

[@12voltvids]

Its a filter of some type. Low pass likely.

[@jaceknasalski1422]

It's probably impedance mismatch on the filter (open ground etc.).

[@12voltvids]

@@jaceknasalski1422
Yes open ground.

[@wahyung9669]

Jacek that’s what I guessed but after some though I started doubting myself. It dawned upon me that It’s a VCR composite circuit not a CRT deflection control circuit. Yes interlaced is involved. But the point being the output of the VCR is either composite or that same composite signal goes into a RF board, as it does not require any modification (TBC). It’s just a sream of ananlgue signal with sync pulses, colour burst and a train of pulses of varying duty cycle to wake up the circuit FOR the CRT if its odd field offset or even field offset coming up and at the same time trigger raster to fly back up. I sure you known this, but is for other non tech savvy and tinkers like me. I’m no electronic expert that’s why I enjoy this channel so much, was a dream of mine to work in a tv/vcr repair shop. Now going back to those field sychronization pulse trains/signals or field blanking interval, I noticed both odd/even are not indentical in durration or duty cycle pattern. This could be a possible clue, a speculation why we all seeing a double vision. It’s plausability rest in the circuit diagram. I love these odd faults, the best are those that have the same symthons as common faults. I be dumb founded if this VCR was handed to me, I would not known where to start. It be interesting to see what a high sampling storage scope uncovers on the composite output wave form. I be scrolling towards the field synchronising interval and see if there is a difference between fault state and working state. Another stab in the dark, could be tied to head switching in between frames (not to be confused with between fields on the same head). I’m doing my head (pun not intended), as in my mind can not find an explanation, its almost like ghosting but that happens when 2 RF signals arrive at the same antenna in different times.

[@jaceknasalski1422]

@@wahyung9669 yes, I was wrong. I'm not a repair expert too, it's my hobby. The knowledge is not enough, you need an experience. That fault looks much simpler: open ground->impedance mismatch->reflection in a filter->ghosting image. You don't need a RF signal to see this.

[@whodatdere1]

There was a guy on YT that actually had to re-create a hybrid module for some reason... Now I can't find it...

[@12voltvids]

There was a guy on yt that had made a vacuum tube.

[@whodatdere1]

@@12voltvids I will have to look for that

[@ejonesss]

it may be a cold solder connection.
because if the vcr was subjected to high vibration like was used for mobile use like an rv or camper van.
you may say "this ran on 110 could not be used in mobil use" an inverter may have been used to power it.
since it is a jvc built machine it is possible you can get a donor machine in that has some other worse problem and salvage part from another one.

[@12voltvids]

I think only the town idiot would say that. Everyone knows what inverters are. I had one in the RV i used to have back in the 80s.

[@ejonesss]

@@12voltvids i was saying that because mobile use would be the only reason for vibration damage .

[@12voltvids]

@@ejonesss
You sure about that?
I can assure you that this machine has never been used mobile. I know the history of it since it was new.

[@ejonesss]

@@12voltvids that is why i said "if" because mobile use is the only way i can think of that would provide vibration outside of putting it atop a high power sub woofer

[@12voltvids]

@@ejonesss
Solder connections fail usually because they weren't done right at the factory.

[@tacofortgens3471]

I seen this effect on crts, never on a vcr

[@audiodood]

If you need a replacement for one I have that card from another JVC vcr

[@12voltvids]

I don't need one. This machine is long gone.

[@stphinkle]

What is the function of that chip?

[@12voltvids]

I suspect it is a delay line or low pass filter

[@tinicum54]

Cover 1 eye.

[@motor-doktor9986]

👏

[@duncan-rmi]

reflection in a filter, couple of microseconds. bad joint on a terminating resistor, something like that.

[@duncan-rmi]

I work in broadcast, have done for thirty years. in the sony BVWxx series of betacam decks, there were filters that went bad. ampex did a badge-engineered version of the same deck, & it was their rep, rather than sony's, who told us that instead of spending £300 a pop on these damn things, we could dismantle them & fix them. the filters were in a metal shield, about an inch or so cube, with four or six connectors. you had to get them off the board, which was pretty tough to start with, then heat them up to get the guts out of the tin, then pick off all of the epoxy. the epoxy was the problem.... hygroscopic... moisture got in, turned it capacitive & changed the character of the filter. I reckon we saved about sixty percent of them this way, which was quite the saving.

[@duncan-rmi]

not RF.... chroma. it's to separate the colour-under carrier from luminance. those will be wound components & the cement is to reduce vibrration.

[@12voltvids]

It's a low pass filter to pass the 629khz chroma and strip the higher frequency carrier.

[@12voltvids]

Likely the ground went open.

[@jaceknasalski1422]

Open ground could cause impedance mismatch and displaying double picture.

[@thetechgenie7374]

eBay you can get about $75 for it plus charge separate shipping. I sell a few even mono ones for close to that. I stop messing with Craigslist years ago, as mostly scammers and low ballers on there now.

[@12voltvids]

I was scammed on ebay to the tune of 2500.00 after a buyer filed a charge back and kept the item. Fought it for almost a year and lost in the end, so I will never sell anything on ebay again.
I will throw something out before I will list on ebay.

[@thetechgenie7374]

12voltvids
That sucks, been through buyers that done similar, but call them and push issue till won cases and dealt with a few over the years. Learned never rely on online support and to call and get multiple supervisors If I have to and be Persistence I stay on the phone for over a hour at times I had buyers pull all sorts of scam from claiming not as described, to sending bricks, stealing parts and returning and use 3rd party shipping depots and won every case so far.
Yes eBay will usually always side with the buyers, you have to know the scams buyers pull in detail and be on top of them to do well and not get screwed over. It less then 3%of bad buyers I dealt with, but I know the game and scammers don’t usually bother with me anymore.

[@12voltvids]

@@thetechgenie7374
Fought it for close to a year. In the end PayPal's seller protection is dog shit. Does not cover seller if buyer funds their PayPal account from a credit card only from bank account. They file a charge back with their credit card and I'd their credit card company agrees with them they get their money back end of story. I wasted hours on the phone talking to various managers. In the end they said that is the cost of doing business. No different that if someone goes into a store and shoplifts. Haven't sold on eBay since. Once bitten.

[@Vintaginside]

eBay + PayPal can be a nightmare for the honest seller, let alone fees and comissions. I've had some false claims with subsequent losses and headaches. Result is I've been steering to other platforms.

[@12voltvids]

@@Vintaginside As I said never again. I won't buy anything from ebay (because everyone over pays) and I won't sell. I sell local, in person and get cash in my hand.
I have people meet me at the police station. Lets see them try to pull something off there and rip me off.

[@leonjohnsonjr3331]

Cold solder bad connection

[@12voltvids]

Yup, but could be inside that package and heat transfer fixed it.

[@leonjohnsonjr3331]

I use them to transfer to dvd

[@12voltvids]

I have a few decks for that, SVHS decks, and a couple of Toshiba D VR7 VHS / DVD recorders

[@mfbfreak]

Your scope not being triggered, kinda triggers me.

[@tekvax01]

yup! select the trigger to tv field one or two, and it will lock right up! #triggered