LE52A656 bricked

[fatguy666]

Hi. I've bricked my tv and posted about it on avforums but this seems to be a better place to get advice. Here's my original post.

Yesterday I got a LE52A656 from a friend, he told me the capacitors were gone on it so I replaced them and the tv came back to life.

Being the genius that I am, I thought I'd check out the service menu. To my knowledge I didn't change anything but when I reset the tv I was faced with a purple and green screen. Found a similar problem on a polish site http://www.elektroda.pl/rtvforum/topic2427223.html and that has a picture on it.

Anyway, tried turning it off a couple of times but kept coming back to that screen. I'd already updated the firmware to the latest, thought doing it again might reset everything but now when I press the power button the power led goes off after about 5 flashes but the panel doesn't come on.

Got the tv open again and the caps are all still fine. Short of phoning an engineer (don't have the money to get it fixed) I'm wondering if shorting the eeprom would sort it?

From reading a bit more after I posted it, no one seems to know what chip is the eeprom on this device and I'm not even sure this would work. I've read this post viewtopic.php?f=8&t=5436&p=39370&hilit=brick#p39370 and the only option seems to be going through the 3.5mm service port on the back. I've ordered the cables to do that but will it word if I haven't enabled RS232 debug in the service menu?

Really gutted about this and feel like a proper idiot! Thanks.

[juusso]

If here was no firmware flashing error, then eeprom reset may help. Worth to try.

[fatguy666]

Can't actually find the eeprom on this. From the service manual I got IC112 1103-000129 IC-EEPROM;24C02,2Kbit,256x8Bit,SOP,8P,5x

But can't see it anywhere. There is a metal shield on the board, could it be under that? Trouble is I don't know how to take the shield off

[juusso]

you have to check all 8-pin chips and write down labels. Every 8-pin chip you can find on mainboard on both sides. Post here and we decide which it is.

[fatguy666]

There's 11 that I could see

ic1107
ic1108
ic3101
ic3102
ic3103
ic3104
ic3106
ic3112_4hdm
ic5107
ic6102_dim
ic7206

Thanks for your help!

[juusso]

labels on chips. not ic numbers on mainboard

[fatguy666]

DOH! Sorry, I'll right back!

Most of them had very similar stuff on them but there was one which has "24C256BN" on it, would I be right in thinking that's the one?

From the service manual I had IC112 1103-001385 IC-EEPROM;AT24C256,256Kbit,32Kx8,SOP,8P,

[fatguy666]

Ah well, tried it and it didn't work. I'd already ordered an ex-link cable, not sure that'll do anything but I'll give it a bash when it arrives.

Probably need to replace the whole board now, can get one off ebay for ?50 if it comes to it.

Thanks for you help juuso

[juusso]

oh yes, 24C256BN could be the SoC eeprom. I hope you did everyything correct? Sometimes you require more than one try to get success. And you have to unplug TV from the electricity network first. If you try it from standby, no way, this definitelly wont work

Is here any other atmel chip on board? Because one you just mentioned can be easily by weltrend micom eeprom and it does nothing in your case.

[fatguy666]

juuso, there are lots of other atmel chips on the board but I can't remember what they are and I'm not opening the tv up again unless I get another board.

tbh, I managed to get the wire onto pin 5 ok but think i dropped too much on and stuck 6+7 together. I probably shouldn't have been messing about with it, just had a stubborn determination to try!

Again, thanks for all your help.