UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Television and Video

Notices

Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

Closed Thread
 
Thread Tools
Old 12th Feb 2021, 8:15 pm   #201
samjmann
Heptode
 
samjmann's Avatar
 
Join Date: Feb 2014
Location: Nottingham, UK.
Posts: 645
Default 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
__________________
It's never been right since we've had it...
samjmann is offline  
Old 13th Feb 2021, 2:14 am   #202
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default 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
19Seventy7 is offline  
Old 13th Feb 2021, 12:25 pm   #203
samjmann
Heptode
 
samjmann's Avatar
 
Join Date: Feb 2014
Location: Nottingham, UK.
Posts: 645
Default 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
__________________
It's never been right since we've had it...
samjmann is offline  
Old 13th Feb 2021, 3:49 pm   #204
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default 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
19Seventy7 is offline  
Old 13th Feb 2021, 5:14 pm   #205
John123
Heptode
 
Join Date: Jan 2007
Location: Luton, Bedfordshire, UK.
Posts: 891
Default Re: Philips G8 G22K522

I saw some rather excellent info on triplers and how they work in a recent video.
__________________
Regards,
John
John123 is offline  
Old 15th Feb 2021, 12:48 pm   #206
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default 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
19Seventy7 is offline  
Old 15th Feb 2021, 1:16 pm   #207
Welsh Anorak
Dekatron
 
Welsh Anorak's Avatar
 
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,884
Default 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!
__________________
Glyn
www.gdelectronics.wales
Welsh Anorak is offline  
Old 15th Feb 2021, 2:27 pm   #208
linescan87
Heptode
 
linescan87's Avatar
 
Join Date: Mar 2014
Location: Meath, Ireland
Posts: 547
Default Re: Philips G8 G22K522

Could you not just ad on a bit of high voltage wire? Maybe double up on heat shrink sleeving.
__________________
All the best, John Joe

www.youtube.com/c/ojnojirishvintagetvandradio
linescan87 is offline  
Old 15th Feb 2021, 3:03 pm   #209
Welsh Anorak
Dekatron
 
Welsh Anorak's Avatar
 
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,884
Default Re: Philips G8 G22K522

Maybe if you post a couple of photos we can see what's damaged and make appropriate suggestions.
__________________
Glyn
www.gdelectronics.wales
Welsh Anorak is offline  
Old 15th Feb 2021, 3:52 pm   #210
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default 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
19Seventy7 is offline  
Old 15th Feb 2021, 9:04 pm   #211
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default 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
Attached Thumbnails
Click image for larger version

Name:	F59C40F1-15E7-42DE-9C66-275E834F7E02.jpg
Views:	138
Size:	31.4 KB
ID:	226829   Click image for larger version

Name:	81F80B5D-3567-4BB1-8FE6-681038B9917C.jpg
Views:	121
Size:	20.7 KB
ID:	226830   Click image for larger version

Name:	D1905B2A-D566-4461-8433-5552E3F4AA86.jpg
Views:	132
Size:	30.2 KB
ID:	226831  
19Seventy7 is offline  
Old 15th Feb 2021, 9:27 pm   #212
davyrocket2
Pentode
 
Join Date: Apr 2011
Location: Westgate On Sea, Kent, UK.
Posts: 246
Default 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
davyrocket2 is offline  
Old 15th Feb 2021, 11:38 pm   #213
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default 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
19Seventy7 is offline  
Old 31st Mar 2021, 12:25 am   #214
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default 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
Attached Thumbnails
Click image for larger version

Name:	image0 (11).jpg
Views:	151
Size:	116.5 KB
ID:	230566   Click image for larger version

Name:	image0 (3).jpg
Views:	126
Size:	40.0 KB
ID:	230567  

Last edited by 19Seventy7; 31st Mar 2021 at 12:45 am.
19Seventy7 is offline  
Old 31st Mar 2021, 3:45 pm   #215
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default 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
19Seventy7 is offline  
Old 1st Apr 2021, 6:55 pm   #216
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default 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:
To disabled (override) the colour killer; Connect cathode of D7202 (TP26) to the 15 volt line (TP80). This will at the same time render the P.A.L. identification inoperative.
If it's worth a try, is it okay to connect TP26 to TP80? I assume so as they wrote it in the manual, but just want to double check

Thanks
'77
19Seventy7 is offline  
Old 1st Apr 2021, 7:27 pm   #217
jayceebee
Heptode
 
jayceebee's Avatar
 
Join Date: Jun 2007
Location: Durham, County Durham, UK.
Posts: 640
Default 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".
jayceebee is offline  
Old 1st Apr 2021, 7:39 pm   #218
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default 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
19Seventy7 is offline  
Old 2nd Apr 2021, 9:46 am   #219
Welsh Anorak
Dekatron
 
Welsh Anorak's Avatar
 
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,884
Default Re: Philips G8 G22K522

"Get it right in black and white!"
Always true...
__________________
Glyn
www.gdelectronics.wales
Welsh Anorak is offline  
Old 2nd Apr 2021, 9:47 pm   #220
19Seventy7
Octode
 
19Seventy7's Avatar
 
Join Date: Jun 2018
Location: Essex, UK.
Posts: 1,306
Default 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
19Seventy7 is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 4:36 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.