Hi

Thought I'd put this on here as it may well help some people.

I have a Hyundai HPT4240 screen. It had what appears to be a very common fault where the screen had a 1" black line down the middle of the screen.

After some digging around the Internet I found a site where one of the threads mentioned that this type of fault looked like a part of the screen not getting driven.

This gave me a clue where to look and after a few hours I have found the problem and the screen is now working fine. Its been on for the last 5 hours with no problem where as before the line was there every time I turned the screen on.

The actual fault I found:

Inside the screen at the bottom there is a driver board that goes behind the input board. This board has connectors on the bottom of it that go to the ribbon cables from the bottom of the screen. Half way along the ribbon cable there is a metal plate and on the back of this plate there are some surface mount components solderd onto the ribbon cables.

In total there are 6 of these cables. It appears each one controls a portion of the screen where it connects to the plasma screen. So I looked at the one just to the left of the middle. Where the components were soldered in one of the surface mount resistors had developed a dry joint. So with some carefull soldering I re-did all theresistors and capacitors (there are 4 of each per ribbon). Now the fault is no longer there. No need for a new screen or repair man + parts.

Total cost was about 8 hours to find the problem and 5 minutes with the soldering iron.

To get to these connectors means removing alot of parts from the screen so it takes a while but worth it. I have the unit soak testing now but will be putting it back together fully tomorrow. I can take pics of the problem and how to resolve it if anyone is interested.

Cheers
Dave

That's a coincidence, mine has developed the same fault just 40 minutes ago and I thought I'd do a search on AV Forums for a solution. When it first appeared I moved a few wires (about as technical as I get) and it went. Next time, moved some wires and it went again, though it took alot of wire moving By the third time of wire moving I'd realized there was something wrong with the TV and I could hear the 'Oooh, it'll cost you' already.

If you have any pics that would be great, and well done for getting to the bottom of the problem (assuming the black line hasn't come back, no update yet)

[freeman]

Mine had the turning off & refusing to turn back on problem .Luckily I took out the extended warranty (failed at just over two years) & it's now Comets problem Mine failed on new years eve,phoned Comet next day ,is it wall mounted ? answer yes ,ok engineer coming friday.
Friday came,engineer turned up ,it's wall mounted noted engineer ,yes I said it was when I phoned up the other day.There's two of us we can lift it down says I ,no health & safety won't let me ask you to help lift it down says engineer ,& Comet won't send two engineers on a first vist.
Due to there being two differnt board sets for this tv we will have to collect & take to our depot to look at .Comet collect next tuesday & tell me tv will be returned on the 23rd (a fortnight later).
23rd arrives not a peep from Comet ,so I wait for tv to be returned ,decide to phone Comet in the afternoon to see where tv is ,& they claim 23rd was not a confermed date & they are waiting for parts still (no idea how long they'll be ).
So I was all set to to Currys & pick up another tv(they had some for store collection) ,when I get a phone call from Comet service deptment ,they can't get the parts to fix the tv
But then give me a code to take to my local store for an exchange ,what money is the exchange for I ask as this tv hasn't been sold for a while .How much did you pay for it the service deptment asked ,£1300 I replyed ,that's how much you can have then was the answer
Now waiting for my new Pinoneer 4270xd to be delivered

Hi

No problem has not returned. Given it was there all the time at the end and its been on for a long time now without issue I'd say the problem is fixed.

I did take some pics but they are not too good. Will post them up later tonight.

Dave

This is a pic of one of the riboon cables. There are 6 on my TV that run along the bottom of the screen, Each one controlls the area above it so you cna guess well which one may be at fault. this is one of the end ones as the TV was back together when the pics were taken.

If you take the clips out from the board for the cable then take the metal plate off it will litf up and reveal some parts soldered onto the back of the plate and cable. I re-soldered all the parts (4 resistors and 4 caps) on the cables in the middle of the screen.

To get to the cables in the middle of the screen meant I had to remove the input board as the cables were under the ports on the bottom of the screen. This is what took the time.

Again appologies for the poor quality, couldnt find the camera so had to use my phone which is none too good.

hope it helps

Dave

[camorra]

nice post with informative help to owners of such a model!!

pics are ok

....and to repairmen too

thanks

Sorry for the last reply, black line hasn'r been around since so forgot about it - until yesterday when it came back. Thanks for the pics and advice, much appreciatted, and I've just spotted another poster with the same problem so I'll give him this link

good post dave r, (the soldering on the cable resisters and caps must have been difficult.) Could u explain in a bit more detail on the soldering if possible THANKS !!

i have had the same problem, with the same model, i looked for any dry joints but did not find any. (i have two back lines in center of screen).

but i did notice a burn on the underside of my input board, looks like it come from the speaker inputs. think i have a bigger problem.

but and help would be good !

http://www.avforums.com/forums/image...ies/please.gif

Hi

Its not too hard to do but you do need a good soldering iron with a fine tip (B&Q etc do them for about £10). All I did was go over each joint and touch it up with a fresh bit of solder. If you do one side of each component, and then the other side so you dont get the componenets too hot.

I will say that as for the dry joints you cant see them as the components are surface mounted but for the sake of just re touching the joints which takes little time then its got to be worth a try.

Since doing mine I've had no problems at all with the TV.

Originally Posted by dave_rodger

Hi

Its not too hard to do but you do need a good soldering iron with a fine tip (B&Q etc do them for about £10). All I did was go over each joint and touch it up with a fresh bit of solder. If you do one side of each component, and then the other side so you dont get the componenets too hot.

I will say that as for the dry joints you cant see them as the components are surface mounted but for the sake of just re touching the joints which takes little time then its got to be worth a try.

Since doing mine I've had no problems at all with the TV.

THANKS FOR POST DAVE-R

I'll give it a go in the week when i've got myself a good soldering iron, I'll post results. Been searching for a long time for this help. Nice One...

[ahus98]

Hi, i've had this problem with the black line on the screen just left of the middle. I've opened the screen and attempted to follow instructions of what could possibly be the fault in soldering. I beleive i found the part, but see from the pictures.....

I need to get myself a small soldering iron & figure out whether to attempt just retouching the little guys called C1 - C4 / R1 - R4 or both.

First we have the input board, then i removed it in the picture below, which shows 7 ribbon cables connected to the screen (well i think their all connected to the screen). I removed one of the ribbon cables in the picture by lifting the brown plastic clip upwards.

Then finally this is one of the ribbon cables...

UPDATE: PLEASE NOTE ONLY SOLDER THE LARGE ONES WITH 100 WRITTEN ON THEM, IT DID THE JOB FOR ME.

I Wonder will this really solve the problem, has anyone else had this problem & fixed it ??

I've not yet done anything to it, but its a cool tv, would be nice if i could fix it, the line on my screen appears, disappears whenever it feels like it.

thanks (especially to dave for the instructions on wat to look for, hope this can be fixed)

SORRY I am late with post of results of DAVE-R instructions for the D.I.Y fix it for the hyundai plasma.

It did work, could'nt be happier big thanks dave -r.



All it took was a touch up of dry soldering on all EIGHT components. ( Carefully)
(follow dave-r instructions, solder each side of a component to keep from over heating)
plasma has been on for over 8 hours, NO problems.

thanks dave-r

[ahus98]

Thanks for the report BIG-D, i guess i'll be the next to try it, the components are so tiny though i hope i dont mess it up.

Ah so u did do all 8 of those components, the C/R 1-4's. How did u manage to add solder to the very tiny ones, how much time did it take to complete.

Take the tv apart was quite simple, although we cant see the fault, is it correct to assume its the cable nearest to the line on the screen and is there anything else which could cause such a problem, that is if anyone knows.

I'll b attempting the soldering in the next couple of days.

thanks for the feedback.

Did'nt need to add solder, just carefully dry soldered the components, (heating up the existing solder with a very narrow solder iron). Always allowing cooling time.

Originally Posted by BIG-D

Did'nt need to add solder, just carefully dry soldered the components, (heating up the existing solder with a very narrow solder iron). Always allowing cooling time.

Soldering took about 5 mins including cooling time.

[ahus98]

OK thanks, just still need to go out n get this soldering iron, hope it works.

Had mine apart at the weekend but bottled it didn't have an internet connection at the time and was worried about taking it all apart and not being able to put it back together again.
Will try again this weekend though, now that I've seen the other pics and know that removing the board will reveal the cables.

BTW, a mate had the same problem with hus Hitachi, engineer came out and said the board was busted (without taking it apart), would cost too much to replace. Luckily the TV was still under warranty, but I can't help wonder if it was just the same problem as the Hyundai seems to suffer with.

[ahus98]

Hi, ive spend some time today trying and testing the tv but its appeared its fixed, thanks to the original poster & people who responded.

I've tested it for hours, its been on for about 5 hours now and working fine, connected my pc via DVI, so for the moment a nice 42" Plasma in my room (SWEET).

Will of course test it daily for a couple days to be sure but i think its worked. I initially removed about 3 of the ribbon cables to compare how the soldering looked on each, on the one with the problem (left to the middle), seems the soldering was cracked on some of the components particular visible on 1 (larger component). i also took a pen and made a little marking where the black line was located so i was sure it lined up to the appropriate ribbon cable. Attempted to reheat the solder with the iron from ebay for under £4, but when i tried it didn't work seems the iron removed a bit too much solder from one, so luckily had some fine solder which i added the slighest touch & redid the areas which i thought needed some extra,

I CONCENTRATED ON THE LARGER COMPONENTS AS THE SMALLER ONES SEEMED FINE BUT STILL TOUCHED A FEW OF THEM, I WOULD SUGGEST THAT YOU ATTEMPT THE LARGER COMPOENTS FIRST, BE VERY CAREFUL ON THE SMALL ONES.

Also make note of the metal plate undernearth the input board if connecting to test, ensure that it is in and that the input board and the little tuner board where the ariel is connected is screwed in saftely as not to cause any shorting, if this happens u could destroy it im sure. Once i was happy that the line wasn't coming back i closed it up, luckily finding the location for all the screws, i'll post pictures to help if u forget.

Opening the screen is fine, although a fair amount of screws, if you find difficult i suggest u have lots of space and make a record of where or at least photograph where the screws come from at each stage.

I have taken some photos if you are unsure how to put it back together so hopefully that will help, will post by the weekend.

Hope i said everything i have to, if yur unsure of something its best to ask guys/gals, if yur tv is broke n yur not bothered to open it, can i have it please, lol. GOOD LUCK & THANKS FOR THE RESPONSES.

[ahus98]

Just a quick mention, i assume that most people getting this fault have a line on the screen just a little to the right of the middle of the screen so its not actually central.

[ahus98]

Here are a few images of the tv, if opening, you need to or may need to remove the 2 silver metal sheets on the right(may not need to remove the right side, please check) and left on the screen, then remove the board with the inputs to the screen, followed by another metal panel which will reveal the cables. Reassembly was fairly easy, ensure u place the screws seperately though, the back cover itself has lots of screws, i kept those seperately from the screws from the inside of the tv.

I've actually got 3 lines on mine, the first that appeared is, as I look at the screen, to the right of centre. The 2nd that appeared is to the left of the screen and the 3rd to the right, at least I know what watching TV in prison must be like

As I said, I did take it apart last weekend, started to take the input board out but then thought twice as I had no way to view this thread if it all went wrong.
Put it all back together then realized I'd forgotten to reconnect a plug with 2 small screws so had to open it up and disassemble again. Still ended up with 1 screw left over though, and another small screw lost in the TV somwhere. Despite 2 of us lifting the tv, turning it upside down and shaking it, the bloody thing wouldn't come out from it's hiding place.

Ahus, forgot to ask, did you do all of the ribbon cables or just the one that was affecting the picture? Seems to me that if I've now got 3 lines, it's only a matter of time before the rest go, may as well do them all.

[ahus98]

By the way, i actually worked one mainly one of the ribbon cables where the line was present, i did check some of d others but didn't want to mess with them for the moment, although some of d others didn't look so healthy. I'll see how it goes, hope no lines return for a while.

I recommend u find a place where u can leave your tv cause its all going to take some time, especially those screws if they go running off, so keep them safe.

Lucky u to have three lines, well there are 7 ribbon cables on mine, if u wish to look and redo them all u could but when i was retouching them, the soldering iron can sometimes remove the solder well in my case anyway, i did need to add a little for those which needed, be very careful, u need very very little amount.

I'm not sure i'd probably first try n fix d existing lines, so make a little mark at the bottom of the screen where the line is, check the ribbon cables, see if the solder is cracked, fix yur lot n see if the lines disappear, if they do and your comfortable with doing them all then why not.

How is it that these joints if anyone knows gets so dried and cracked in a couple years, the heat, bad design or manufacturing or what?

Ah my tv is working fine still, well pleased with d results.

[The TV Engineer]

The joys of Lead free solder....

Also, if you get these lines and any of the larger resistors (10 Ohm) look blackened or have a small pin hole in them, this is due to the failure of one of the bonded IC's....
Very Very common fault, especially on this LG V5 panel. (i believe this set is the LG type anyway)
When these chips fail its a disaster as they cant be replaced, and means the whole PDP screen is u/s.

Praise to the guys who posted the walkthrough and photo's..

[ahus98]

Lead free solder, as i read it has problems, didn't look too much into it, but is there a solution or they just built these things so it dont last as long as d old crt's so people need to buy a new tv every 5 - 10 years.

Is there an alternative solution to this crappy solder? D lead version was stronger was it, until the lead was removed as a Hazardous Substance as part of (RoHS) & WEEE, meaning they got rid it of in July 1996, hmm.

Its not right, these cost of items these days are quite high & many people could just be told to throw away their perfectly working tv cause they have no idea it can be fixed, that just isn't right.

As for the resistors, luckily none fo them are gone, Yea i think this is a LG boards, cause i saw some lg stuff inside. Inside the model written is

PDP42V51330, urm, anyone know of an electronic manual for this Hyundai model? As i got this tv recently so a manual might be helpful for some of the menus n stuff, do u guys know whether the screen settings firmware can be updated to be better, cause its a bit lame, not enough settings.

The design of the screen is a bit weird, as if one of those little resistors fail, u cant really replace the part or for the unlucky ones who hand slips when trying to resolder the part near the ribbon cable, turn the cable and your tv is doomed, hey its possible, as its a bit awkward to solder in such a position, so be warned, keep it steady

thanks all

[The TV Engineer]

Yeah the 42V5 is the LG Version 5. This is the same as the SKY PDS4250 plasma and also a couple of the Toshibas.

I havent a manual for the Hyundai software no.

Well, gave it a go at the weekend but it hasn't helped. My brother came over on Saturday, the plan being to do it then, problem was that I hadn't used the TV for the past week, and the lines didn't appear though we had it running for 5 hours. Then, just before we settled down with the PS2, the lines came back

So Sunday morning we opened it up and set about fixing it. Eventually got everything out of the way (thanks to the pics, though the circuit board is different to mine), unclipped the ribbon cables and started. Unfortunately I didn't have a fine tipped iron (tried all the local DIY shops and they were sold out or didn't stock them) so was obviously rather nervous and think I underdid it a bit. Because the iron was flat tipped I was worried about burning the ribbon cable.

I've now ordered a fine-tipped iron from ebay but need a little advice about soldering. I've never had to dry solder before so not sure what I should be doing. I assume that I should be melting the solder that's already there and then letting it coll again? How long should the iron be in contact with the solder? And when someone says to do both sides, do they mean left and right of the R1-R4's or both sides of the cable (front and back). Didn't see how the back could be soldered without burning the ribbon?
Intend to have another go at the weekend

[ahus98]

Well hoonercat all lines disappeared hmm, sounds like how my tv operated when i got it, as it wasnt operated for a while, it ran for days before the line appeared. The soldering has to be the solution of course if u do it right, so take your time, it will be worth it when done properly.

I actually did the larger, wat do u call them, resistors (r1-4), i've never soldered such small components either but the one i bought of ebay did the job. When its said both side, take component R1, u have 2 ends of that component either side of the 100 written in the middle, where u see the solder just there, no where else.

I did try the dry soldering, as advised by the original post lister. Tried 2/3 times until i got it to work while soldering, yur not going to get it perfect & some of the solder comes off on the iron, so i luckily found some fine solder which i needed to add to 1 or 2 of the resistors, the slighest amount to ensure the components were properly joined.

Did one end of each component then returned to the first & doing the other end after so the components didn't get too hot, i held it there until it was hot enough to meld the solder, not too long, but u should see the solder spreading and looking shiny silder when its done so, just ensure their done properly & no cracks show.

I used my eyes, but u should use a magnifing glass to double check for cracks or to see if the solder is holding properly, if not you may need to add solder on those.

Hope that helps, all the best with that, u will need a few hours to do some patience & especially when u want to test it, u dont need to completely put everything back but put enough to ensure that the boards are held firmly and in place and that no part can touch anywhere and short out otherwise your tv will probably become as useful as your tablemat.

I put back the metal place over the ribbon cables, 2 screws over the turner board & 2 screws on the input board & observed the screen, my viewpoint being the floor looking up over the bed i had it on.

[The TV Engineer]

When you solder them, dont put solder on the iron tip, this is a common mistake and is a big no no...

You only do this when 'tinning' a new tip.

Have someone help you if required, and use one hand to hold the iron, and the other the solder, place the iron onto the joint, and as it heats it, then add a small amount of the solder onto the component, and it should flow nicely onto the joint.

If you put dollops onto the iron, it is heated too much and when you try and make it stick to the resistor and ribbon it will get messy, overheat the ribbon and resistor and probably cause damage, or.. this method will probably cause an even worse dry joint.

The best option for a novice using a soldering iron is to use some liquid solder flux.. lightly brush a small amount onto the existing solder joint and then heat the joint with the iron, this is whats known as a 're-flowing' technique.
you will be surprised with this easy method.. very effective.

Thanks for the advice, soldering Iron (fine-tipped this time ) turned up today but I probably won't get a chance to try it until the following weekend, I will let you know if it works (or if I ruin my TV ).

liquid solder flux

I like the sound of that