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17IPS02-2 (technika 19in lcd No Power)

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Turnip:
Hi B/I,

Thanks for the shematic, hope you've sorted the set, if not, some voltages, perhaps.

Not met a rising ESR - suspect battery in your meter - Chris.

blackillusion:
Hi Chris, not a problem.

On with the set, nope I haven't got very far. I am a novice so still learning a lot. Reading through LCD repairs by justine yong and testing the voltages. I fluffed up and blew the voltage regulator and looks like a transistor and a zener again. So have replaced the regulator and zener. I get 244V ac at the rectifier diodes. I get DC 340V over the filter capacitor - isn't that a bit much?

Also I don't get a stable voltage out of the VCC pin from the regulator, might be because I have replaced the transistor Q810 (the coppers are visible).

Turnip:
Hi there,

Haven't read the Justine Yong bit, but would suggest you try a new panel from "ChasHyde" and mend the other at your leisure.

340v at the filter is normal, as is the 244 AC input - it's a matter of checking all pre-chopper transformer components for failure - any duff bits can pop the rest at switch on.

Tough life - for the dedicated telly basher - Chris.

blackillusion:
Indeed its all fun and games. Well the fact is I'm learning and using this one to learn. Its a spare time thing and no rush to go anywhere so can take as long as I want. Obviously this is a power supply fault. I need to replace transistor Q810 and would be back where I was before blowing the regulator IC.

jimca007:
can I make a suggestion to protect your nice new components and , in an emergency you !
Make up a wee extension lead with a 100 watt light bulb ( ordinary lamp bulb ) in series with the live before it reaches the socket of the extension and use this to test your repairs.
if you have a severe overload the bulb will light and remain lit. If it gives a wee falsh and goes out the loads pretty normal and if it flashes the psu's trying to come up and overloading.
It's basic it's cheap and it's easy but can save a right few quid in blown components !

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