Mulja tv repair portal
Equipment Repairs => LCD TV forum => Topic started by: bonesy on November 12, 2016,06:18:28
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Hi guy's got the above model Philips,which is dead no st-by light.The set has no customer controls at all on set,just remote.I've checked psu voltages,the always 12 volts is low at 9volts,24volts sitting at 20 volts.There are no voltages from signals board back to psu (psu on or st-by on/off)I presume because the 12 volts to signal board is low.The voltage across the smoothing caps is just short of 360 volts,caps rated at 450 volts,so may be a little low.Just wondered if anyone's had any dealings with this 4000 series t.v.
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Is there no 5V for the micro?
Dave
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No ,there's nothing marked up on either end of psu cable,so I presume its derived from the always 12 volt, on the signals board.& because the 12volt is low,then 5 or 3.3 volt is also very low.
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Strange, maybe look around the micro for a voltage clue, should be a electrolytic around, the main clue is no standby light.
Dave
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Well spent a bit more time on it Saturday,Ran up psu out of set by applying 5 volts to psu on pin from ssb.All rails came up to near marked values.As I said it has no customer controls on set,or so I thought!But when I removed the ssb board from set,right at the bottom of the av inputs section,I found a small tact switch.When I looked on bracket to see what it was,it's marked with on/off symbol.Gave it a push & away it went,all working fine.Stupid engineer,stupid design,still at least wont fall for that again.Lol.
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Yep, I know how you feel..... I've been had like that - and so as as other folks, the owners I mean.
"Mi telly's not workin, can ya come un ava look pleese"..... sure you get there and find the plugs been removed by 'er who must be obeyed' for hovering purposes, just as I was getting the last screw out the back..... Oh oh, what's this I've found! Now if they'd painted the darn button red it'd stand out like a sore thumb - right where you wouldn't expect to see a switch.
Dave
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Philips have always done things their way, and having worked for a rental company tied to them, you should always expect the unexpected.
Can be an earner though, as had several Philips CRT combo in where folks didn't realise the on/off switch was on the side even after they'd turned it off there - Chris.
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I think it got me because there were no other customer controls on the set.Won't forget that one again.The tact switch was literally right in the bottom corner,very poorly marked.
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Philips have always done things their way, and having worked for a rental company tied to them, you should always expect the unexpected...... - Chris.
Right on.... and they never change. So you'll know about the G6 and the PD500 voltage stabilizer then. My worst nightmare with Philips is their auto change record player decks..... one telly can't remember the chassis wires use to fall off every time I looked at them.
Dave
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I think I was lucky,I fixed a few g8 &9's but mostly kt3 & k30/5 which I didn't mind.I remember some years back now being confronted with a 36" wide screen set,sat on a massive glass stand with legs.
After spending a huge amount of time looking fiddling,came to the conclusion it was all one piece,not stand plus tv.When the custy came home he confirmed that when un-boxed in house it was all in one.
So had to spend ages fixing it in the house.Made lots of money out of the famous "Charlie" vhs decks,rebuilding them,engineers use to bring them to me by the van load,tubes of white grease & lots of patience.Lol.I wonder if I could remember how to do one now,or Panasonic G mechs another big earner.
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Could pick KT3 and G8 up as ex-rentals, they were good sellers. G8's were the 'bottle swappers dream' - just lob a new panel in.
A bottle swapper an engineer who's capabilities doesn't exceed that of changing valve's and always carries a screwdriver in his top pocket for clouting purposes.
Dave
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Hi Dave,
It's a thought but G8's had few valves. We used to have a chap in the old days who could screw the mains input down to 200v without taking the back off.
We eventually lost him to private enterprise - He used to take the bus for his rounds as could service tellies without tools.
Sadly lost touch in the late 60s, but 'HO' is ever remembered in Norwich - Chris.
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You are right Turnip.... I meant G11 chassis.
Dave
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I worked with one,the most short tempered person you could ever wish to meet.He could look at his job sheets & predict which ones would have to come in which ones you took the back off.He new the location of every public loo in Northampton(weak bladder)The main controlling factor every single day,was be back to by 4.45pm because of the F in 5o'clock traffic all other drivers are f in merchant bankers.Being a passenger in the little Bedford van was like an outing with Lewis Hamilton minus the skill set.We were all convinced that one day,he would just keel over from a heart attack.In his time he knocked countless people off bicycles,at least two coppers on traffic duty & one traffic warden on the bonnet of the van.Never prosecuted would you believe.
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Hi Dave,
You're pulling my BU105/2 - G11's had even less valves than G8s.
Matter of curious history - Worked with a chap who worked for 'Spencer West' in Gt Yarmouth. He insisted that they had sorted colour television using a mono tube, and in the late 50s.
Reality was rather fun as they did design - sort'a, but insisted most every valve should be dual to save cost - They did sound with a PCF80 and F/OP with an ECL80 where bottom cramping was the norm. Mind you, they did great cabinets, as one of the chaps was great with wood.
Never saw their colour set, but at 19 was almost a believer, as can be at that age - Chris.
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My Dad for many years worked all over the uk,installing / removing machines from factories.Lathes,huge milling machines,transformers,all sorts of stuff.I remember him telling me about working at a GEC plant,in the 1950's,where one of the research engineers showed him their experimental colour t.v.All mounted in dexion racking,full of valves & stood about 7 plus feet tall & around 8-10 feet long.The end result was displayed on an RCA picture which was almost ,but not quite round.Dad reckons this was around 1954/55 ish,but can't remember where the factory was.The nearest I got to that was the thorn 3000/3500 service rack that was made of dexion & Rank Bush Murphy,was a more plush blue welded steel frame,with slots,you placed your board in an ally frame & that fitted/slid into the main steel frame.
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Hi Bonesy,
The Ferg 3000/3500 were cool sets (Although caps suffered as they sensibly placed the power and line scan boards at the top - To be heated by everything else)
Was working for Rediffusion at the time, where panels were mended in a standard telly with a mirror behind it. They also tried mend Bush 823 and their very own crap colour hybrid set the same way.
Horrified, as I formerly worked for Visionhire who sensibly had test rigs for most every set (Apart from the GEC models that never went seriously wrong, and the Decca hybrids were just as good, and had better pictures)
Was lucky enough to buy a mono test card generator in a 7 foot rack from Pye in Lowestoft. Used a monoscope tube and used nearly 3 kw - Warm workshop 'till I got the colour version that worked off 2 x AA cells a while later - Chris.
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Young apprentice fitted headphone socket on a Thorn 1400 chassis in his bedroom. Lol, using old style head phones one night.... he got hell of a shock, then ber ber BANG as the wire melted! The headphone socket lead draped across the dropper!
Yeah Redifusion MK3 & 4 sets were great sets ...... and so was Granada's with the thyristor line stages. Redifusions I saved the I.F panels for the IFT as coil formers.
Dave
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I wasn't great fan of thorn stuff tbh,I did like the ITT/KB sets,Decca's all gave good pictures,I think the Granada sets were called "Finlandia" may be,Scandinavian sets,very good pictures.My Mum & Dad had two Tandberg ctv2.2 chassis,very good set's very reliable,they both clocked up over 20 years,before their lovely Teak / Rosewood cabinets were replaced with finest Panasonic black plastic,which after being on for three/four hours use to let out a loud cracking sound,as the plastic expanded.During the very late seventies early eighties,there was a shortage of tv sets,so all sorts of euro set filled the gap.Oddest one I ever fixed was an EMO from France,nasty pictures,pretend wood cases,dodgy tuning.
I'm sure like me,it's hard to believe how many manufacturers there were & how many are long gone,but every now & then an old name reappears from the past,but this time cheap nasty set.
Suppose we should have made this separate post,lol.
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Hi Bonesy,
Best tube set I ever met was the B&O - Also in rosewood, but so full of (SSB) dries that folks binned them before the tubes had expired although sound and picture quality was terrific for the time, with that flip down panel for tuning and such.
Next best was one that used 4 x BD131 in bridge for F/OP - Telefunken of course, where if a fly crawled across the touch buttons - Got a service call that night. It was rather amazing as it had a drop panel under the set with an incredible number of pots to sort convergence, and to be honest, it could be the best converged set on the market.
Again got pile of them early, and with good tubes due to heat induced dries, so moved everything hot on to aluminium panels fixed above the main board. Took a while, but in those days I had time and enthusiasm, rentals being profitable - Chris.
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Yes I had forgotten about the B&O's the little shop in London where I served my time,was an agent,very expensive sets,fantastic build quality,but the early valve ones ran so hot.If I remember rightly all the cables were laced together around the edges of the panels.I think they lost a bit of their sparkle when the first all transistor sets came in,we changed quite a lot of early PIL tubes,which failed.
I also remember Telefunkens & of course proper Grundigs & early ultra sonic remote hand sets.All gave very good pictures.You tend to forget that almost all the Scandinavian countries also had their own tv manufacturers,all of which are now gone.How many people there must have been at one time making,selling & repairing that box that sits up the corner of the room,or now day's hangs on the wall.
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Hi Bonesy,
Had forgotten 'till you mentioned 'Grundig' with the thyristor line scan, where dries were just a bit of a problem, and Sony sets with a 'Gate Turn Off' thyristor thingy that didn't, and went S/C.
Guess can't complain about modern sets, even if we have to puzzle 'em out, as they're cheap enough to dump after any guarantee, and the bits can be useful.
Mind you, have been saving bits for some years, and it's mostly a waste of space and time, as folks move on to the newer models which are thinner, and now curved for some reason. Mind you, a curved screen should be tougher than a flat one - Chris.
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I'm sure the custy's will find new ways to smash even curved one's,lol.