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Samsung P2270HD Backlight switches off after 2 seconds

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jamiem1987:
Hi this is my first time posting here, been reading for a while and there's some fantastic advice on here.

I have a Samsung P2270HD LCD TV in for repair, basically the set powers up ok and the picture is crisp and clear for 2 seconds before the backlight shuts down, the sound stays on and I can still see the faint image of the lcd,

I've checked all the capacitors on the psu and they all look fine (no bulging/leaking)

Also it's a combined inverter/psu board

Anyone got any ideas?

Many thanks,
Jamie

ProDave:
Inverters switching off after a second or so is because the inverter circuit has detected something is wrong.

It may be a faulty tube, or just a tube gone out of tollerance, of could be a a component fault, often capacitors or transformers.

Do you have the circuit or service manual?

Have a look and tell us what chip is used for the inverter, there are many tricks you can do to disable or inhibit the protection circuits that will enable the inverter to run in spite of a fault which might make it easier to find and fix the real fault.

sparky:
hi
try and post a pic of power supply
dave

jamiem1987:
I havent got a service manual for this set, neither can I find the chip that controls the inverter, I've attached a picture to see if you guys can help me out any further

sparky:
hi
you will find the inverter transformer o/c intermitanttly
wiltsgrove sell them
dave

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