This effect is caused by capacitors.

Try the AV Ports. If the effect is also there by using a vx recorder or any other external device, then the RGB board is defect.

Otherwise the tuner.

But: replace ALL electrolyt capacitors... on power supply and mainboard.

 Pink colours or green is a different problem, the PTC on the mainboard may be defect.

Die_Bogener:

Try the AV Ports. If the effect is also there by using a vx recorder or any other external device, then the RGB board is defect.

Otherwise the tuner. But: replace ALL electrolyt capacitors... on power supply and mainboard.

Now as you mentioned I remember that I tested that. The problem was the same with tuner and VCR.
So that would indicate the RGB board is defect? Should I first check the RGB board for some easily
spotted troubles or just replace the capacitors? How many of those there are? Any special types?

Die_Bogener:

 Pink colours or green is a different problem, the PTC on the mainboard may be defect.

The pink text color appears in teletext pages and in the on-screen-texts like channel names
and sound/picture adjusting bars. Sometimes the color is correct, sometimes not. Repairable?

Die_Bogener:

But: replace ALL electrolyt capacitors... on power supply and mainboard.

 Still thinking...

If I would start by replacing the caps: 

How big an operation this would be? How many capacitors there are in total to be replaced? And how easy task this is, I have a soldering tools and basic skills. How long it would take (approx) to complete?  Does anyone happen to have any pictures of the "insides" of a BeoVision LX5500, so I could get an idea what kind of space I'd be working on?

 In the case the RGB board is defect, how "bad" that would be? 

If you are not experienced in TV repair, I would be very wary about digging inside. The voltages can be lethal.

The set however is designed to be repaired and the boards will slide out - the service manual is on site.

Peter:

If you are not experienced in TV repair, I would be very wary about digging inside. The voltages can be lethal.

The set however is designed to be repaired and the boards will slide out - the service manual is on site.

Indeed I am not experienced in those things but I have red a lot about these and know the danger. I my case I'd be VERY careful and most likely to keep the TV unplugged as long as possible before making anything inside. And think twice before doing anything! Those are dangerous things, always good to remaind.

 

I've also found the service manual and checked it. Good reference. And as the boards are easily accessible I guess I'll try. Just waiting for the day I've time... :)

 

The MX/LX5500 takes around 3-4 hours to replace all capacitors. Costs are around 50 Euro.

If you dont have all necessary spare parts available, it takes a really long time to order... 105 degree Low ESR types are requiered and especially these types are hard to get.

Do not try to use standard 85C capacitors, they wont live long enough... maybe sometimes only some hours.

 Martin

 

Regarding the parts: do I have to first get the TV and take one capacitor out, mark it's ratings, then take out the next etc. or is there a part list somewhere available? (So I could order all the parts once and then just replace them one by one). I'll anyway need to order those as I don't have any 105 deg. caps. I cheched my retailer's website and there seems to be some Low ESR 105 deg. types available (at least). I downloaded the service manual, but didn't get too much out of it.

Start with the sync. board it placed in by itself on the bottom PCB next to the EHT trafo.

Yes: imho this is the board to start with (a known trouble maker) and just re-solder the solderings, especially if you look on the soldering side upper left, there's an IC and the smd things above that is usually causing trouble.

ipaul:

Yes: imho this is the board to start with (a known trouble maker) and just re-solder the solderings, especially if you look on the soldering side upper left, there's an IC and the smd things above that is usually causing trouble.

The board 'stands' on the motherboard in 2 small plastic clamps.

imho recapping is a bit of a waiste of time and money for this type of tv and chances are little you actually solve the problem, in these chassis it's mostly the same few caps going bad (if at all) and the others usually last for the lifetime of the tv, after all i assume you're not expecting it to work for another 20 years :)....

Generally speaking, the 'bad type caps' found in these tv's are the brown coloured elcos, used in some chassis and are usually founf in the base of the HT transistor and in the power supply, but these are not causing your problem.

Another easy trick: buy another one (not worth much without remote) and swap boards, so you know which board is faulty...

My experience with this model is that the weak part is the soldering/boards itself and there are less and less around with a reasonable tube because of the age (but if you find a good one it is a great tv with great sound).

Of course I expect this to work for another 20 years... :) I'd hope it to!
This would be basically just a try to fix the tv, to prevent it being dumped as nonworking... it wouldn't deserve that kind of destiny! Thanks for your post, I'll try resoldering first. Anything dramaticall to remember to do / or not to do? (Afraid of burning the IC accidently)

I've seen those brown elcos in some other B&O's of mine too. Some I've changed had had cracs on the top so they really looked bad.

Unfortunately I can't just buy another one, as I would hardly have the space for one anyway, not for two! (And those are still not too cheap here in Finland as there aren't too many of those around)

I really like the TV mostly because of it's excellent sound and desing.

There are plenty of dead sets on ebay ... would suggest buying one and swapping the panels ... makes a lot more sense timewise and less likely to get yourself into trouble ... once you have isolated the problem to one area, it will be simpler to perform your repair.

 

Neil 

Lausvi, i think the caps with the cracks on the top are of the older (pre-LX5500) type, the ones i refer to are the ones with the 'shiny' top, the trouble with those is that sometimes these start leaking, if so usually you can see the spots on the board and even smells.

ipaul:

Lausvi, i think the caps with the cracks on the top are of the older (pre-LX5500) type, the ones i refer to are the ones with the 'shiny' top, the trouble with those is that sometimes these start leaking, if so usually you can see the spots on the board and even smells.

Yes, I was actually thinking about non-tv-stuff. But yes, I know the problem

 

ipaul:

Usually, i start with pulling the chassis out, switch the tv on and with a plastic (or any isolated !!!!) 'tool' (like a tooth brush back end) i tap a bit on that suspicious board (or any other) while looking at the picture (if needed use a mirror) to find the 'pain-spot'.

Also checking the board with a magnifying glass will sometimes show little cracks in the soldering joints, many times you couldn't tell with the bare eye..

Carefully apply some new solder to the joint, as said the boards get weak because of ageing....