Technika lcd40-270 pcb issues??

[andyw632]

hi all new to the forum, please tell me if i break any forum rules . i have a technika lcd40-270 that turns on and off on its own for like 20 minutes until it eventually powers on and works perfectly until i turn it off, i purchased a used pcb off of ebay, which the tv just turns on and off but never turns on with the ebay bought pcb, the seller assures me it works, but i have read how terrible these board's are and in my mind if my pcb turns the tv on after 20 minutes and the ebay bought one doesnt turn on at all, the one he sent is faulty too, does this sound like a faulty pcb or could it be the main board? thanks in advance for any info/help andy

[vinceroger69]

Re: Technika lcd40-270 pcb issues??

does sound like the ebay ones faulty, whats the part/model number from the power board? if you have a multimeter there maybe some tests we can help you do also if possible can you upload a clear picture of the psu so we can see what we are dealing with cheers.

[andyw632]

Re: Technika lcd40-270 pcb issues??

yes ill get on with uploading the pictures straight away, the board model is g0281d v0:0

[andyw632]

Re: Technika lcd40-270 pcb issues??

struggled getting pictures with phone, could possibly upload some better ones tomorrow, thanks for your reply and also my pcb is exactly the same but a couple of the solder joints are touching on the right hand side of the board under the connectors on the ebay one but on mine they aren't not sure if thats how its meant to be or not, thank you

[vinceroger69]

Re: Technika lcd40-270 pcb issues??

struggled getting pictures with phone, could possibly upload some better ones tomorrow, thanks for your reply and also my pcb is exactly the same but a couple of the solder joints are touching on the right hand side of the board under the connectors on the ebay one but on mine they aren't not sure if thats how its meant to be or not, thank you

can you show a picture of your board and then the ebay one so we can see what you mean cheers

[andyw632]

Re: Technika lcd40-270 pcb issues??

ill do it straight in the morning, the mrs is moaning as she wants to watch the tv and dont appreciate it being in bits lol, thanks for your help and sorry for the inconvenience, i apreciate your time and effort, thanks

[vinceroger69]

Re: Technika lcd40-270 pcb issues??

try this with your working psu before you switch it on in the morning try heating the whole power supply up with a hair dryer for about 3 to 4 minutes also aim the air under the heat sinks onto the capactors under them it the tv now starts straight up ok theres a good chance its just a capacitor issue on your old but working psu

[andyw632]

Re: Technika lcd40-270 pcb issues??

i tried it earlier on both psu's it certainly came on faster but still took time on mine, but it made no difference to the ebay one, but ill give it a go tomorrow because i didnt hold the heat on for aslong as that, cheers

[tom66]

Re: Technika lcd40-270 pcb issues??

To me that indicates a bad PSU... You could prob fix the original yourself. My guess - cold solder or bad startup cap

[andyw632]

Re: Technika lcd40-270 pcb issues??

Soldering really isn't my forte I must admit but general knowledge is quite good l.I take it as the startup cap is the largest one on its own? Thanks

[vinceroger69]

Re: Technika lcd40-270 pcb issues??

no the start up cap is usually a very little one in size when the lights good try to take a good clear picture and we will point it out but also try the hairdryer trick too as some times if a cap is bad heating it up will get the set working for fault finding purposes.

[vinceroger69]

Re: Technika lcd40-270 pcb issues??

sorry my post came up twice please ignore

[budm]

Re: Technika lcd40-270 pcb issues??

Start up caps.

[andyw632]

Re: Technika lcd40-270 pcb issues??

its definately the startup caps, it comes on about in about 2 minutes when i heat the 2 capacitors, iv resoldered them underneath, but still same reply, there 220uf 50v im trying to locate some panasonic ones but im worried about the size, will they all fit or do they differ in sizes, thanks for the help guys, this is genuinely the best forum ive come across in a long time

[tom66]

Re: Technika lcd40-270 pcb issues??

Buy them from CPC. Free delivery. Don't risk it with eBay.
What values do you need?

[andyw632]

Re: Technika lcd40-270 pcb issues??

220uf 50v,10uf 50v is that is or is there some more info thats on them? thanks

[tom66]

Re: Technika lcd40-270 pcb issues??

Are they the only two small caps on the primary (HOT, AC) side of the power supply? Any other small ones in that region? Note, primary marked by the black boundary.

[andyw632]

Re: Technika lcd40-270 pcb issues??

yes theres 2 small ones 25v 47uf and another small one looks the same as the one stated but theres no details on it that i can see because of the metal surround covering it

[tom66]

Re: Technika lcd40-270 pcb issues??

It's probably best to replace all of them. You can bend the capacitor over to read the values, or desolder them.

[elviramjw]

Re: Technika lcd40-270 pcb issues??

Did this solve your problem? I have the same issue with the same model tv