LG 60pb5600 unidentified reboot

[olivier.gendron@gmail.com]

Hi,

I have a plasma TV that is sometime restarting for no reason.

I replace the power supply and still have the same problem.

If I unplug everything except the power supply and the main board.. still have the same problem.

So, I conclude the problem is from the main board.

I have redone all solder joint that was looking poorly but no change.

Do you guys have any clue of wich part I should replace ?

[Andrew F. Ali]

Re: LG 60pb5600 unidentified reboot

Look for cold solder joints on the PSU. Especially the components on the heatsinks and those transformer legs.

[R_J]

Re: LG 60pb5600 unidentified reboot

I see shopjimmy has a main board repair kit, 2 larger ic's and the eeprom so maybe that would fix it?

[Andrew F. Ali]

Re: LG 60pb5600 unidentified reboot

Is the eeprom coming pre-programmed? If it is then you can give it a try or you can look for a another Main Bd. I missed in your original post where you mention that you replaced the PSU already.

[olivier.gendron@gmail.com]

Re: LG 60pb5600 unidentified reboot

Thank you Andrew F. Ali

R_J Yes I know ! but the fact that the problem is intermittent not sure if its ICS .

[Andrew F. Ali]

Re: LG 60pb5600 unidentified reboot

Perhaps you have loose cable connector?

[olivier.gendron@gmail.com]

Re: LG 60pb5600 unidentified reboot

Andrew F. Ali -> I dont think so. But to me a bad eprom will fail instantly not some times , not sure that is the problem. Is there a way to test it ?

[olivier.gendron@gmail.com]

Re: LG 60pb5600 unidentified reboot

Andrew F. Ali -> cables are fine

[Andrew F. Ali]

Re: LG 60pb5600 unidentified reboot

Andrew F. Ali -> I dont think so. But to me a bad eprom will fail instantly not some times.

I agree with you here. A cold solder in the CPU could cause this too. Do you have a Hot air Station?

[olivier.gendron@gmail.com]

Re: LG 60pb5600 unidentified reboot

I agree with you here. A cold solder in the CPU could cause this too. Do you have a Hot air Station?

.

No, but I tried with a heatgun twice, same problem, there is a lot of plastic component so wasnt that hot. I'm good at soldering, maybe i can try to carefully heat all the pins.

[Andrew F. Ali]

Re: LG 60pb5600 unidentified reboot

That's a lot of pins that are very close together. Have you considered just getting another Main Bd. off e-bay or Amazon??

[olivier.gendron@gmail.com]

Re: LG 60pb5600 unidentified reboot

This is not so bad ! I'll try and let you know