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LCD repair education.
fix2003:
small monthly magazine pdfs
i would like to read them 2 are they uploadable here
cheers
Keith:
Hi
there are several training manuals in the downloads section, I know 'coz I put them there! Unfortunately manufacturers service and training information isn't what it used to be, I don't think they expect equipment to be repaired out of warranty.
I will see if I have any other training stuff about.
Keith
Davy:
Apart from LCD TV Courses which is as rare as rocking horse manure, there is only one way to learn... "get cracking" with 'hands on experience', that's how you learned the old method. These modern sets need a total different approach in servicing.
The main criteria I'd say is the power supply and inverter board, if it's a fault on the main board, then I'd reckon everyone would be scratching their heads for a while at least..... what is there to change, have you the tools should we have a chip down, will it be worth it? As someone on here said getting to know what voltages to expect from a psu is a good start which these must be 'hash free'.
The trouble with TV engineering and such like in this day and age is because these things are a 'throw away', many a folk won't even bother to have these repaired, there's the quote and the bill, I've had TV sets given to me as scraps when all they wanted was a psu re-cap.
I too started with crystal sets... those were the days!
OldLes:
Keith, where exactly is the "downloads section", I can't see it. It is usually very obvious to others when I seem to be blind to the obvious. (It took me a while to realise that many "non-existent" circuits referred to in messages only appeared when I was logged in!) Can you point me to some of the training manuals you have downloaded?
Davy,yes, I know I need to just get "stuck in", but I have so many demands on my time that if I spend an hour today, it may be another week before I look again, so I almost need to repeat all the same steps.
For another couple of months I have the advantage of analogue signals as well as digital, but that changes soon. I am pretty well equipped with test gear, such as DVM, Avo, sig gennies (probably redundant), analogue storage and traditional scopes (mains and mains / battery) and other stuff.
Where I need to freshen up the grey cells is with a dead set, working out why? It seems that "Stop" signals appear from everywhere, and I need to get to the logic of where they all are, and which to look at first.
The main advantage I have is that the only pressures to complete come from me. Since I retired, I made the decision that I don't work for anybody for money. Myself, or good friends for free. I hope to present my son with a couple of LCD sets, but only if there is no significant monetary outlay. OldLes.
Keith:
Hi Old Les,
If you look at the top of this page you will see 'downloads' just click that.
Modern electronic equipment is usually processor controlled, making fault finding very difficult! Protection circuits don't just monitor voltage and current. If the processor doesn't get the correct communication from all circuits it will shut down, which is why corrupt eeprom data causes lots of problems.
With LCD TVs it usually possible to force a power supply on so you can check for correct voltages and clean supplies. And you can usually force an inverter on too. Unless anyone knows of some tricks the only way to check a main board or Tcon is by substitution.
I don't do many TVs now as the customer usually says 'If it's gonna cost more than 20 quid we'll buy a new one'
This is a Sony training manual.
http://www.tv.quuq.org/index.php?ind=downloads&op=entry_view&iden=1391
Good luck
Keith
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