technika lcd 32-209 screen blanking

[wessy67]

hi there i am new to this site i have a problem with my lcd tv the picture is perfect after switching on then after 1 min 55 seconds the screen freezes and then the screen fades to blank still got sound so switch it off and on again and it does exactally the same and the same time could this be down to a faulty capacitor any advice would be greatly recieved

[seanc]

Re: technika lcd 32-209 screen blanking

Can you take the back off and take some pictures?
They can be a maximum of 2000x2000px and please attach them to the forum using the manage attachments function.

[wessy67]

Re: technika lcd 32-209 screen blanking

here are some pics with the bach off seanc

[Dgtech]

Re: technika lcd 32-209 screen blanking

After closely reading the description of the problem, it sounds more like an overheating processor than capacitor problem. However, It only costs about $5.00 to change the caps out just to rule them out.

[wessy67]

Re: technika lcd 32-209 screen blanking

After closely reading the description of the problem, it sounds more like an overheating processor than capacitor problem. However, It only costs about $5.00 to change the caps out just to rule them out.

thanks dgtech would finding this possible prossesor be a big job

[Dgtech]

Re: technika lcd 32-209 screen blanking

Change out the caps first with low ESR caps. Ruling this out is critical to taking the next steps. Replacing the processor means replacing the board so... do the easiest, cheepest step first - capicitors. Of course, you can always check the connectors for a good connection.

[japlytic]

Re: technika lcd 32-209 screen blanking

I see what appears to be Samxon GF Series in the power supply board, which are a known bad unit. What are the other brands and series (e.g. CapXon KF) of electrolytic capacitors on the main logic board?
Also, replace the two black and one brown electrolytic capacitors in the bottom right corner of the main logic board.
Finally, check the SMD electrolytics if they are not bulging.
I think the heatsinking of the main system controller in the centre of the main logic board is inadequate.

[wessy67]

Re: technika lcd 32-209 screen blanking

I see what appears to be Samxon GF Series in the power supply board, which are a known bad unit. What are the other brands and series (e.g. CapXon KF) of electrolytic capacitors on the main logic board?
Also, replace the two black and one brown electrolytic capacitors in the bottom right corner of the main logic board.
Finally, check the SMD electrolytics if they are not bulging.
I think the heatsinking of the main system controller in the centre of the main logic board is inadequate.

sorry for the delay japlytic here is a little drawing of capacitors

[wessy67]

Re: technika lcd 32-209 screen blanking

can anyone say which other caps on the above drawing are know bad caps please

[momaka]

Re: technika lcd 32-209 screen blanking

All are, except for the EPCOS. EPCOS makes good capacitors. However, I see that one of them is rated for 85C only. Therefore, it would be a good idea to replace it, as well as all of the other 85C rated caps.
Samxon also makes good caps, but their GF series are known to be problematic.
The only cap you don't need to replace is the 150uF 450V Samxon.

[wessy67]

Re: technika lcd 32-209 screen blanking

thanks momaka will do