Bad Caps in Mitsubishi CK-2690R TV

[Per Hansson]

Re: Bad Caps in Mitsubishi CK-2690R TV

Thanks for the info on the SLR
Impressive pics for such a erm, how do I put this, relativley speaking compared to what is available cheap lens

So now you only have the 18-70 lens? Why not buy some more?
You know, SLR cameras are a great way to burn money, but since you already own one or several? I gues you already figured that part out

[Krankshaft]

Re: Bad Caps in Mitsubishi CK-2690R TV

The jungle IC is the main signal processor IC that usually contains the IF, sync, chroma, horizontal and vertical drive, video, etc all on one IC.

It's a jungle of circuits . You could say Signal Processor IC if you want but I guess that doesn't sound obscure enough.

The IC I replaced in my Panasonic CRT (with the weird OSD, sound, but no picture symptom) was the result of a bad jungle IC.

[bgavin]

Re: Bad Caps in Mitsubishi CK-2690R TV

So now you only have the 18-70 lens? Why not buy some more?

I own a Sinar 4x5, full complement of Rodenstock Sironar-II lenses, plus Nikon 75mm ultrawide. Lusting over a 47mm super angulon, but only in my heart.

I also own multiple Nikon film SLRs, full complement of Nikkors.
Nikonos, single 35mm lens.
Multiple RZ-67, full complement.
Four C330f, full complement.

The only thing that gets used is the D200 and 18~70.
I'd like to have the 18~200, plus the 12~24, but I've been out of work 5 years... no money for toys.
The 18~70 really works well.

[Per Hansson]

Re: Bad Caps in Mitsubishi CK-2690R TV

wow, that's some serious piece of kit!
I can tell you have been into this muuuuch longer than I have (hell, probably longer than I'm old )

[bgavin]

Re: Bad Caps in Mitsubishi CK-2690R TV

I started shooting weddings in 1968 (age 18), with C330 tlr. I was a free agent for a discount wedding shop in San Francisco. All they wanted was decently exposed negs. I got paid $75 for the shoot, turned in the film, they handled the rest.

As it turned out, I have a flair for doing wedding work.
I take along a full size backdrop and full Norman 2000 strobe system, umbrellas, slaves, etc. I run a wireless trigger these days to free me from the cord. This portable studio produces beautiful results in otherwise crappy locations.

This was shot in a junk room at the local community center. Pentax 6x7, 135mm lens, if I remember correctly. Kodak Pro-S color negative film.

[Per Hansson]

Re: Bad Caps in Mitsubishi CK-2690R TV

Impressive shots bgavin, I looked some more on your site
And I was right, I'm born '83 so you've been shooting longer than I've lived

[bgavin]

Re: Bad Caps in Mitsubishi CK-2690R TV

I'm just that much closer to dead...


My daughter's drummer loaned us a 32" Toshiba until I get ours fixed.
Jeeeez... I've never moved such a HEAVY television before. It was everything the two of us could move from her car last night. It filled the cargo bay of her Matrix.

I true redneck fashion, I have the working TV sitting on top of the dead TV.

BTW: can anybody tell me if removing the HV cable from the CRT is an easy or difficult task? This would make it much easier for me to solder the board on the bench, instead of at the back of the set.

[Krankshaft]

Re: Bad Caps in Mitsubishi CK-2690R TV

Hehe I have a 32" Toshiba (Orion built flatscreen CRT).

Quite a beast weight wise I agree. I'd say washers, dryers, and fridges I've moved were heavier though. CRTs tend to want to tilt forward since all the weight is at the face of the CRT (where all the thick glass is).

Be sure to discharge the anode first get a flathead screw driver.

Take some wire put alligator clips on the ends clip one end to the screwdriver and the other end to the CRT ground braid.

It will be tensioned by a spring across the DAG of the CRT. With the wire connected slip the screwdriver under the suction cup and make contact with the anode clip.

After it's discharged peel up the suction cup the connector is just a two claw squeeze clip. Squeeze the clip together with a pair of pliers gently and remove the anode wire.

Be sure to attach that alligator lead from the braid to the anode cap and keep it grounded because the CRT can regain some HV even after discharging.

[PlainBill]

Re: Bad Caps in Mitsubishi CK-2690R TV

I'm just that much closer to dead...


My daughter's drummer loaned us a 32" Toshiba until I get ours fixed.
Jeeeez... I've never moved such a HEAVY television before. It was everything the two of us could move from her car last night. It filled the cargo bay of her Matrix.

I true redneck fashion, I have the working TV sitting on top of the dead TV.

BTW: can anybody tell me if removing the HV cable from the CRT is an easy or difficult task? This would make it much easier for me to solder the board on the bench, instead of at the back of the set.

It's easy if you take the proper precautions.

If a picture is worth 1000 words, a video must be worth even more. This You Tube video gives directions.

PlainBill

[Per Hansson]

Re: Bad Caps in Mitsubishi CK-2690R TV

I was just thinking video please when I read Krankshaft's post
And then with PlainBill's even more so
But no linkeh?

bgavin; But I will also be that much closer to dead when I'm able to use the equipment like you

[PlainBill]

Re: Bad Caps in Mitsubishi CK-2690R TV

I was just thinking video please when I read Krankshaft's post
And then with PlainBill's even more so
But no linkeh?

bgavin; But I will also be that much closer to dead when I'm able to use the equipment like you

Growing up in Minnesota, I learned to avoid Swedish jokes.

Your point about the link is well taken. Look Here:

PlainBill

[Wizard]

Re: Bad Caps in Mitsubishi CK-2690R TV

Plainbill, that link is bad instruction. Note the certain comments. Kitchen glove is a deathly JOKE, HV have no problem going through this. Also guys are wrong about 90 plus KV. These TVs operates 5 to 32KV depending on one CRT of given size (larger CRT and multi-CRTs needs is beyond 27KV, max is 32KV).

The right way is HV probe. I use probe's tip under the suction cup to discharge the CRTs through the clip clipped to the bare grounding braid strap that is stretched tight across the CRT's bell. First clip the grounding clip to that said strap and work the HV probe under the suction cup and listen for gentle crackles/clicks and watch the needle fade away to nothing. There are ways to construct safer HV discharge tool. It takes several 500K carbon resistors in series inside a plastic or glass tube and sealed well at both ends with stiff wire poking out at one end and other end sufficient length of wire to a clip.

Ghetto is good screwdriver with length of jumper wire (ends are clips) and do this but it will be loud *snap!* and Not too GOOD to CRT's anode button (blows the dag coating around the anode button, inside side of CRT) this way. I usually reserve this ghetto method for junking CRTs. But I don't like doing this as there is no way of knowing if the handle is sufficent or has a flaw that HV simply chose to fly to one's hand while discharging to the ground so I use HV probe either way.

Cheers, Wizard

[PlainBill]

Re: Bad Caps in Mitsubishi CK-2690R TV

Plainbill, that link is bad instruction. Note the certain comments. Kitchen glove is a deathly JOKE, HV have no problem going through this. Also guys are wrong about 90 plus KV. These TVs operates 5 to 32KV depending on one CRT of given size (larger CRT and multi-CRTs needs is beyond 27KV, max is 32KV).

The right way is HV probe. I use probe's tip under the suction cup to discharge the CRTs through the clip clipped to the bare grounding braid strap that is stretched tight across the CRT's bell. First clip the grounding clip to that said strap and work the HV probe under the suction cup and listen for gentle crackles/clicks and watch the needle fade away to nothing. There are ways to construct safer HV discharge tool. It takes several 500K carbon resistors in series inside a plastic or glass tube and sealed well at both ends with stiff wire poking out at one end and other end sufficient length of wire to a clip.

Ghetto is good screwdriver with length of jumper wire (ends are clips) and do this but it will be loud *snap!* and Not too GOOD to CRT's anode button (blows the dag coating around the anode button, inside side of CRT) this way. I usually reserve this ghetto method for junking CRTs. But I don't like doing this as there is no way of knowing if the handle is sufficent or has a flaw that HV simply chose to fly to one's hand while discharging to the ground so I use HV probe either way.

Cheers, Wizard

Wizard, you obviously have much more experience with modern TV chassis than I do. I seem to recall that a couple of decades ago manufacturers started getting the 5 KV focus voltage by using a voltage divider fed by the CRT voltage. IIRC, this provided two benefits - the focus voltage tracked changes in the high voltage, providing a more stable focus, and as a side benefit, it discharged the CRT. Was I mistaken, or have things continued to evolve and this is no longer the case?

PlainBill

[bgavin]

Re: Bad Caps in Mitsubishi CK-2690R TV

Is there a danger if i simply leave it connected to the board while I work the board?

From the comments above, it seem the CRT is live with stored energy, and being attached to the board might give me a very bad experience.

[Krankshaft]

Re: Bad Caps in Mitsubishi CK-2690R TV

Getting bit by the HV builds character . High voltage low current.

I have had some sets self discharge (to around 2kv) within hours however others haven't. Besides during troubleshooting it's not uncommon to power up the board for a test and then disconnect it again if you didn't find the problem or need to examine the board more closely.

I personally discharge with my HV probe (Tenma brand from MCM) but that thing cost me $70 bucks. Which I'm sure someone who will only use it once won't want to invest in.

http://www.mcmelectronics.com/produc...-6530-/72-6530

But since I've worked on many TVs and have used it countless times it's paid for itself.

Leaving it connected is more trouble than it's worth it's a PITA to work on a board with it connected the board will probably be vertical the whole time.

If you haven't plugged in the set for a day or so the HV will probably be close to nothing you may not even hear a snap from the screwdriver.

[bgavin]

Re: Bad Caps in Mitsubishi CK-2690R TV

Is there a PDF or eBook that has TV Service for Dummies?

[Krankshaft]

Re: Bad Caps in Mitsubishi CK-2690R TV

This book got me started:

http://www.amazon.com/TV-Repair-Begi.../dp/0070158061

It's not an ebook though.

This book is great for those who know the basics:

It really goes into detail exactly how the horizontal circuits function, deflection types, the inner workings of a CRT, troubleshooting methods, etc.

http://www.amazon.com/ES-Presents-TV...9516203&sr=1-3

I picked up a used copy for less then half price.

After the books though it's just experience gained by working on different sets. I learn something new every day and I've always got you guys on the forums if I'm stumped.

[bgavin]

Re: Bad Caps in Mitsubishi CK-2690R TV

I found a used Amazon copy for $16 shipped, so it is on order.
Thanks for the tip.

[Wizard]

Re: Bad Caps in Mitsubishi CK-2690R TV

I work on board with HV suction cup stuck to the CRT all the time since majority of problems is easily resolved for day to day work. Only and only time I have to brother pop off HV cup/unclip from CRT is if TV is clumsy (read: consoles) or need real long and detailed work then I do it.

There is only one and one brand that is WORSE to do that is RCA with rear projection types starting PTK195 and later is they went from push in/pull out to permanent push in with external rubber sleeve. The RCA service manual states one have to worry at wire (spin it both ways bunch of time while maintaining steady pull till bit of wire breaks in two. I tell you it is extremely ANNOYING and runs high chance of leaving too much bit of wire behind in there rendering 60-100 part junk for reuse!

The solution is unsolder flyback transformer from the mainboard and pull mainboard out. After making *certain* fly is not the problem which is usually is. And RCA is so predictable in failures.

Cheers, Wizard

[bgavin]

Re: Bad Caps in Mitsubishi CK-2690R TV

Just a bit off topic...
Q: Who makes the most reliable TV? Just in case I have to buy a new one..