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Forum 1

CTV 1979 Philips G22C700/01 G11 Chassis

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crustytv
(@crustytv)
Posts: 12254
Vrat Founder Admin
Topic starter
 

You may have seen my request to find a Philips G11 with Teletext in the wanted section. Well, @slidertogrid was thinning out his collection and had a non-Teletext for sale, long story short, I decided to buy it anyway as I fancied it, and it adds to my Philips collection. I now have a 1969 G22K511 G6, a 1973 Philips G17T320 (mono)320 series, a *1974 G8 Philips G26k536/05, and now a 1979 Philips G22C700/01.

The set was working, but herein lies a tale of woe and a word of caution even when using Shiply.

I bought two TVs from Rich (the other one will be another thread) so posted a transport request on Shiply. In due course all the bids started to roll in, the usual chancers quoting stupid prices, followed by the more sensible ones. I did my due diligence (although I thought I had) checking feedback and jobs. Opted for a team that had glowing reports, although they had only been on shiplys books for a few months.

To cut a very long story short, they had little regard or understanding what they were transporting required care. Thankfully, Rich had wrapped the two sets in bubble wrap. One TV was very large so would not roll around, but had a vulnerability point at the rear due to a large box protruding to protect the neck end of the CRT. The other was this G11, light thin and would easily tumble if not secured, you can guess where I'm going with this.

However, I was unaware of this tumble and assumed as it had been working before I would just power up, tune in and place it in the museum. Upon powering up, I started tuning into the museum signal, after a few seconds I thought it curious that the snowy raster not appeared and just as I checked the brightness all of a sudden there was a mighty Whoosh, Phut! Followed by a cloud of smoke.

Hmmm, off to the bench.

Upon opening up, I was presented with a line board hanging from its plugs and 3E out of its socket, likewise the dynamic correction panel was dislodged hanging. It then dawned on me for this to have happened the set must have taken a tumble or two in the back of the van. Yep, the air turned blue F'fing idiots was the mild version.

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The panels had detached due to the chassis to PCB mounting lugs having sheared off, this resulted in the top corner of the line board breaking off, luckily no traces were damaged. The correction panel mounts had also sheared, but had not broken the panel. Searching in my stores produced a set of NOS G11 chassis mounts.

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OK, that dealt with that problem, but what was the cause of Whoosh, Phut, smoke? I noticed C129 looked incinerated on one side, ah-ha the culprit, or so I thought. In went a new 0.47 400V and I powered up yet again, and this time I had line collapse, Yikes! As it happens, Rich sent me a NOS line unit, it was in pristine condition, so in that went, exactly the same line collapse fault!

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Surely two boards could not have the same fault, especially when one is a pristine new old stock, so I started fearing that the scan coils had gone o/c or there was some unseen damage to the correction panel that routes coils. I then as is so usual of me I embarked on a rabbit hole afternoon, by the evening having continuity checked all the coils, all leads and all PCB traces I was no further forward, and feeling like I should take up knitting, time to break for a spot of dinner.

Upon my return later that evening with a refreshed and fed mind, I studied the cct, following the path of the line scan. Clarity descended, C129 (already now replaced), C131 & C135, all in the feed to the scan coils via the correction panel. C135 the last in the chain, "hmm a 910n cap, let's check that, OH that only reads 10n". OK so what does the NOS line panel read, that read OK at 910n! Curious, so why did it produce the exact same fault as the original line board.

Sod-law is why! Looking at the NOS board print side, C135 had a dry joint, so wasn't in circuit. The original board's C135 had failed very sneakily via the lead-out nearest C129 and left virtually no trace of its failure, giving me the impression it was C129 that had burned up. What were the chances of two boards having different failures of C135.

Replacing C135 brought sanity back and the TV is working just fine now.

Having subsequently spoken to a couple of TV engineers, they said, "OH yes, the 910n cap was a known failure point on the G11.  Oh, to have the benefit of trade experience!

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Up until this time, I've not had any problems with shiply drivers, and I've been using them for 10+ years. What this has taught me is to avoid people who have been with shiply just a few months despite glowing reviews, I won't make that mistake again. It could have been so much worse, and thankfully the TV yet to be revealed arrived unscathed.

Sorry for the long-winded post, chaps, if you've made it this far you have my sympathy.


* Below a 1974 G8 Philips G26k536/05, if anyone is up for swapping this lovely clean example on its original stand for any 22" G8, send me a pm.

Forum 2

CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection

 
Posted : 21/06/2024 4:04 pm
ntscuser, Cathovisor, slidertogrid and 1 people reacted
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slidertogrid
(@slidertogrid)
Posts: 1403
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I'm so pleased that you have repaired the set Chris, I was gutted when you sent me the pictures of the damage. The set was my bedroom set for many years. I'm delighted it has found such a good home.  Previously when a courier collected some sets they wrapped them in blankets and secured them with ratchet straps, Not so with this latest bunch. Thank Gawd we bubble wrapped them! I explained at length that the sets must be secure and not allowed to fall over it obviously fell on deaf (or stupid) ears! Anyway all's well that ends well, the set looks great! 

Rich

 
Posted : 21/06/2024 5:26 pm
crustytv reacted
crustytv
(@crustytv)
Posts: 12254
Vrat Founder Admin
Topic starter
 

The G11 is now on a stand and placed in the museum, currently sandwiched between two PYEs' and two TX's, placed underneath is a period correct Philips VR2022 video 2000 VCR. At some point, I need to have a good rearrange to group sets together. However, that's going to be like playing those little puzzle games we had as kids, remember them? Shuffle little plastic red and white squares around, until you get them split evenly left and right. Well, you get my drift. Now, must try and find a little Philips sign to place on top.

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CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection

 
Posted : 22/06/2024 5:04 am
Lloyd and Cathovisor reacted
Cathovisor
(@cathovisor)
Posts: 6700
Famed Member Registered
 

I've just realised that I have a number of those little push switches with the red LED in them; they were in one of those "mixed items by weight" that Sendz Components used to sell.

 
Posted : 22/06/2024 7:35 am
crustytv reacted
Doz
 Doz
(@doz)
Posts: 1503
Prominent Member Registered
 

I remember a 9n1 giving issues, but not a 910n.... but it was a long time ago!

 
Posted : 22/06/2024 9:58 am
crustytv
(@crustytv)
Posts: 12254
Vrat Founder Admin
Topic starter
 

Maybe your brain remembers it as a .91uF and not nF, whatever, it's such a damn weird value!

c135

 

CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection

 
Posted : 22/06/2024 10:29 am
Doz reacted
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