12th Feb 2021, 8:15 pm | #201 |
Heptode
Join Date: Feb 2014
Location: Nottingham, UK.
Posts: 645
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Re: Philips G8 G22K522
Burning the midnight oil with this one!
If you get a so called universal tripler, be careful that the diode and capacitor leads are connected correctly. If not you can get all sorts of odd picture effects. I'm sorry but I cannot ever remember fitting a universal into a G8, but maybe someone on the forum may be able to to advise. Whatever you do don't crop any of the leads until you're quite sure everything is OK.. From what I recall you could use a universal for any TV, but the diode and cap lead connection varied model to model. SJM
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13th Feb 2021, 2:14 am | #202 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
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Re: Philips G8 G22K522
Definitely was, I was up until about 4 AM trying to sort it out. I’m really gutted about it as I’d have liked to have kept it as original as possible, but getting it to work again is more important to me.
I’ve thought about soldering some HV cable from the tripler given to me to the cable I’m left with. I have some insulation tubing from the tripler given to me too. I’m not sure if it’d be worth risking it though. There’s a tripler on Donberg which I might buy and fit. I’m a little worried about the LOPT panel snapping as it turned out the wire had come loose too, unfortunately. There’s a small amount left that I should probably be able to solder but I’ve no idea if its still intact under the insulation. Fingers crossed it is. I’m not even really sure how the panel broke, I was removing the remnants of the old rubber cap and it just came with it. Must go brittle with age as the original LOPTs panel I removed shattered into pieces. I’m going to order some super strength super glue to repair the panel and then probably a new tripler. Id rather be safe than sorry around the EHT sections. Thanks ‘77 |
13th Feb 2021, 12:25 pm | #203 |
Heptode
Join Date: Feb 2014
Location: Nottingham, UK.
Posts: 645
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Re: Philips G8 G22K522
Personally I would go with the HV cable and sleeving. If you can make the AC feed post on the tripler as solid as possible, so much the better.
Chances are there is still quite a few other problems to sort out yet, no point in running up more cost before you really have to. I've lost count of the number of times I got a shock from that connector, when I used regularly service G8's. Does give you a very nasty jolt, but I lived to see the day. Always have one hand completely away from the chassis when working live. That way current doesn't flow through the chest directly. Whatever you do stay safe, ensure you're away from large earthy masses like radiators, when working live. SJM
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13th Feb 2021, 3:49 pm | #204 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
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Re: Philips G8 G22K522
I think I’ll go with the HV cable and sleeving too, as you say it saves cost and I’ve still got a lot to sort out. I’ll also get some HV tape to wrap around the join. Just to make sure it’s secure and well insulated. Wasn’t sure if it was a good idea either
I can imagine it’s easy to get a shock from that connector. I always have my hand behind my back or in my pocket and always make sure I’m away from anything metal. Though the funniest thing is I’ve only ever been shocked by a TV when it’s off, never when it’s on. Touch wood... Thanks for the help ‘77 |
13th Feb 2021, 5:14 pm | #205 |
Heptode
Join Date: Jan 2007
Location: Luton, Bedfordshire, UK.
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Re: Philips G8 G22K522
I saw some rather excellent info on triplers and how they work in a recent video.
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15th Feb 2021, 12:48 pm | #206 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
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Re: Philips G8 G22K522
That's a really interesting video, Thanks for linking it. I've seen Michaels videos a few times but I've only just now subscribed.
His video did get me thinking though, of actually repairing my tripler itself, in that I open it up, attach a new lead and pour some new resin in. I'd actually much rather that approach for some reason Thanks '77 |
15th Feb 2021, 1:16 pm | #207 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,884
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Re: Philips G8 G22K522
If you do make sure you use a resin capable of withstanding high voltages. Bear in mind chips and lockfits aren't keen on kilovolts arcing to chassis!
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15th Feb 2021, 2:27 pm | #208 |
Heptode
Join Date: Mar 2014
Location: Meath, Ireland
Posts: 547
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Re: Philips G8 G22K522
Could you not just ad on a bit of high voltage wire? Maybe double up on heat shrink sleeving.
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15th Feb 2021, 3:03 pm | #209 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,884
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Re: Philips G8 G22K522
Maybe if you post a couple of photos we can see what's damaged and make appropriate suggestions.
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15th Feb 2021, 3:52 pm | #210 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
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Re: Philips G8 G22K522
Well my original plan was to add some more HV wiring, but I don't know if I trust it too much. I did originally do it and it felt weak, granted heat shrink will strengthen it a bit.
Thanks for the heads up about the resin if I do go down that route. I'd have probably just bought any old type. I'll get some photos over when I can, I'm a little busy at the minute but give me an hour or so and I'll have them up |
15th Feb 2021, 9:04 pm | #211 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
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Re: Philips G8 G22K522
Well wasn’t that a long hour
I got some photos but they’re not very good as my camera just wouldn’t focus. Theres still plenty of cable left, and it’s only just too short to reach the stud. Maybe it’ll be better to strip the cable down further to give me more wire to work with Thanks ‘77 |
15th Feb 2021, 9:27 pm | #212 |
Pentode
Join Date: Apr 2011
Location: Westgate On Sea, Kent, UK.
Posts: 246
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Re: Philips G8 G22K522
Do you have a drill then make a small hole thread the wire through use the piece you are trying to connect and make a loop and thread through and solder carefully use flux if it helps make the join
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15th Feb 2021, 11:38 pm | #213 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
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Re: Philips G8 G22K522
Oh I didnt think of that at all, I'll give that a go I think. Definitely sounds much better than just soldering the two ends.
I'll let you know how it goes Thanks for the ideas and help, really appreciate it '77 |
31st Mar 2021, 12:25 am | #214 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
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Re: Philips G8 G22K522
We're up and running again!
It's taken me a while to get round to it as I've been applying some glue to the snapped LOPT panel every day or so to build up some strength, (real reason was I was just too wussy and kept putting it off as I didn't want to ruin anything further ) I ended up attaching some HV wire and sleeving as said. It probably isn't the best of repairs as it was extremely awkward, but it's holding and it shouldn't see any more disruption for a while, so unless problems occur it can stay. Managed to get a picture on screen, this time off a Freeview box just as that's what was wired up. Don't let the image fool you, there's still a lack of sync, I was just lucky enough to get a picture while it was relatively centred, so I know it's not just the xbox the set doesn't like. Still plenty of faults to cure but at least there's a picture to work with again - I forgot about the 120uF cap until this write up, I’ll swap it out tomorrow and see what happens there Thanks '77 Last edited by 19Seventy7; 31st Mar 2021 at 12:45 am. |
31st Mar 2021, 3:45 pm | #215 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
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Re: Philips G8 G22K522
Another update: Replaced C538 with a 220uF and this does seem to have made a significant improvement, although not 100%. The picture will remain stable for longer, and doesn't scroll as long before it locks again. There's limited colour at times, but it does seem that when the colour goes the picture is most stable - so no change there.
Thanks '77 |
1st Apr 2021, 6:55 pm | #216 | |
Octode
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
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Re: Philips G8 G22K522
Just had a thought, would you say it's worth a try disabling the colour killer to see if that has an affect, considering it's struggling mainly with colour images.
Quote from the manual: Quote:
Thanks '77 |
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1st Apr 2021, 7:27 pm | #217 |
Heptode
Join Date: Jun 2007
Location: Durham, County Durham, UK.
Posts: 640
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Re: Philips G8 G22K522
Don't waste your time looking for faults in the chroma circuitry, there may be none. Colour problems can often be caused by incorrect timing of pulses fed from the line output stage, particularly those fed to the colour burst blanking and as you still have weak line lock this could very easily be the cause. Concentrate on achieving solid line lock, as the saying goes "get it right in black and white".
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1st Apr 2021, 7:39 pm | #218 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
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Re: Philips G8 G22K522
I don't think there is a fault as such within the colour circuitry as from what I can see it has got relatively good colour. It was just as I've very rarely got line lock on a colour picture compared to black and white.
overriding would've just been to see if it had an affect or not, but wont worry too much about it for now then Thanks '77 |
2nd Apr 2021, 9:46 am | #219 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,884
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Re: Philips G8 G22K522
"Get it right in black and white!"
Always true... |
2nd Apr 2021, 9:47 pm | #220 |
Octode
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
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Re: Philips G8 G22K522
Which is why I wondered if overriding the colour killer would perhaps help stabilise the picture.
I thought maybe if it did lock the picture that maybe I could measure the points that I’ve already done and see if there were any differences, and see if it could possibly show where the fault may lie within the IF/Timebase panel(s)? I can’t think of anything else now, not that I’d know much anyway. Thanks ‘77 |