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lcd invertor boards

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norman:
Hi folks, I have been in the TV trade for 35 years now and I am looking for help on repairing invertor boards. I have had very little success in repairing them, I have checked transformers, capacitors, connections to no avail. Does anyone have fault finding information on these. Do you know of an inverter circuit that could be built to check lamps or a jig that could be built to repair/check invertor boards. Sorry for all the questions but I look forward to any replies. I hope I can be of help to anyone looking for information in the future. Norman.

rebel-mc:
Hi, I would normally just replace a small (2,4 or 6) invertor with a generic type.  I have fixed a few invertors by replacing some of the surface mount diodes or transistors.  But this has only been by robbing parts off another board.

TE:
DIEMEN, SA launches the first CCFL tester lamp for LCD TV which is able to check lamps for LCD screens from 10” to 42”. The CCFL lamp analyser for LCD TV provides a diagnosis for the lamp on the panel television/monitor without having to dismantle the part of the panel housing the lamps and without having to unplug the different connectors interacting between the inverter and the lamps. It gives a full, reliable analysis so in case the instrument indicates a bad functioning of one or several lamps, the panel can be dismantled and the lamp replaced with complete safety. When the instrument indicates that the lamp works correctly, this means that the breakdown is on the inverter board. This tester provides a significant reduction on the time spent on the repair since you avoid to uselessly dismantle the TV.

http://www.hrdiemen.com/products/eng/detall_noticies2.php

norman:
Thanks for the replies, I am slowly getting better at invertor repairs, I feel I spend too much time fault finding only to find I can,t locate spares. As we are all aware the price of invertor boards particularily for small screen tv's makes them uneconomic to repair. Thanks again for the input. Norman :wallbash:

Ohm Supplies:
Hi Norman

We find mostly the transformers are faulty.  We have even had a few boards where all the transformers have been faulty!!!!! Its just a learning curve learning how the transformers read and noticing the differencs between them, but I'm sure you'll get there.

We do sell transformers if you ever want to check us out.

www.ohmsupplies.co.uk

Kind Regards
Michelle

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