Samsung P2270HD Backlight switches off after 2 seconds

[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

[jo11yr0ger]

I have exactly that same issue.  The picture shows occasionally for a split seconds then switches off leaving a black screen and just the sound playing..  Did you fix yours and if so what did you buy and how did you do it.

Any help would be appreciated.  

[sparky]

hi
you can buy from ebay unsolder old one and fit new one
fault cured
dave

[jo11yr0ger]

Not sure what i am looking for on Ebay?

[sparky]

hi
inverter transformer or the complete panel
do you no what to do?
dave

[jo11yr0ger]

Absolutely no idea mate i'm afraid.

[Turnip]

Hi,

Original piccy not good enough to make out panel or transformer number - checked my pics and can't find identical one - Chris.

[jo11yr0ger]

Might just sell it as faulty for spares.  As I'm getting no where with it.  Curry's where i brought it fun want 95 pound before they've even diagnosed the problem then will come the bill to fix it.  By this time i may as well have purchased a new one.

[gemjen2]

if you live anywhere near south derbyshire id be happy to help you,sam

[sabre504]

Hi if you update your area you live in there may be a member close enough to help more

[jo11yr0ger]

Hi if you update your area you live in there may be a member close enough to help more

Done, Thanks.