Mulja tv repair portal
Equipment Repairs => LCD TV forum => Topic started by: feenix on December 19, 2011,05:49:59
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Ran for 5 yrs long hrs no probs
Now wont start led just flashing on/off @ 1/2 sec intervals with slight clicking noise so assume s/m power supply fault
Anyone been ther and where the heck is the AS helpline or spares site
I can post a pic of board if poss
Thanks All :41:
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Show us a picture.
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Show us a picture.
OK how do I go about that?
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Hi, From what I could see on your picture I don't recognise that panel. Are there any output voltages from it?
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Hi Feenix,
What piccy ? sounds a bit Vestel to me - give some panel numbers, or real piccies - Chris
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Hi, From what I could see on your picture I don't recognise that panel. Are there any output voltages from it?
I have checked diode and the two main drivers on heatsinks but a gegeral opinion poits to capacitiors and no way to test these so cant check votages at mo.further A/S have changed names and dont have their site working yet
Been on net but no one has this unit ie partsmaster ect
Cheers old bean
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Hi Feenix,
What piccy ? sounds a bit Vestel to me - give some panel numbers, or real piccies - Chris
Trust you got that Chris I dont know how to put on forum
Cheers
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Hi Feenix,
Thanks for the pic - haven't seen one exactly the same but last similar one I met had a duff chopper driver chip, think is was a SG6841SZ.
Attached your pic - Chris.
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Hi Feenix,
Thanks for the pic - haven't seen one exactly the same but last similar one I met had a duff chopper driver chip, think is was a SG6841SZ.
Attached your pic - Chris.
-------Yup no one can identify or supply this board! ref that chip----
Is that the small black chip with 2 legs front and 2 back? says IC2 see it on top of transformer (no IC 1 anywhere)
Also there is a diode near one heat sink --see-- near power resistors on left hand side-- at the bottom it was like carbon but cleaned it off looks ok not shorted or o/c may be a zener but get sucker tomorrow so can remove and check it prop all capacitors look mint so who knows
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Thermistor near top coil left h side in black is shorted heat makes no difference to reading this could be the culprit as probably anti-surge? MF72 5 D11 and looks like Ic1 is under board
Cheers
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Groan my local supplier does not keep thermistors-typical
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if you d'nt no what you are doing measuring components you
could do more damage than good try and get a replacement panel
make sure you but all the parts numbers in google and search for one
dave
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If only I could sparky if only I could
Thermistor is shorted no doubt about it but this panel most be well tired by now
Looks like a bin job
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Hi
the thermistor is probably a NTC surge limiter and will read 10 ohms or less, so is more than likely not faulty
Keith
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Yes but no amount of heat brings a change in value which it should
Looked all over for a board and it is hopeless even used and breakers I will have a play after xmas but with the price of another is it really worth it
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Hi Feenix,
That black disc might be a VDR across mains for spike protection. Note the chopper semi seems to have three pins so suspect a drive chip under the board - Chris.
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Yes but no amount of heat brings a change in value which it should
Looked all over for a board and it is hopeless even used and breakers I will have a play after xmas but with the price of another is it really worth it
Well I got lucky or so I thought, someone won a Tevion 19" Hd usb and all that--- and I bought it cheap but despite a 3 yy warranty the picture is truly awful and no amount of adjustment makes a diff so I will be fixin my AS set in 2012---streaks ahead on picture and colour
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That smps is one of the simplest i have seen, thats all, no digs, have a happy new year all of you.
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What I have done before with an unobtainable power supply, is substitute a completely different one.
At the end of the day, it only needs to supply a few voltages (they even label it so you know what they are)
So first power it up with a bench power supply (you may need several) to determine the current requirements for each output.
Source an alternative generic power supply.
You will need to figure out some switching so the standby functions work. I used the "on" signal from the main board to switch a relay, via a transistor.
I did this on a Bauer XT32 a while back as the original PSU had a well known habit of self destructing, and I wanted something more reliable.
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Hi Folks,
Guess our original chum has had some sort'a solution - he got lucky, as he said - who are we to deny his version of reality - Quuq folks are known to be cool and sometimes a bit whimsical, but ever total empathy - Chris.