Forum > LCD TV forum

Fixing a Samsung LE40B652T4W power board (BN44-00264A)

<< < (2/2)

zomikula:
Just the one on the psu
check for any leaky ones.

 MUR360  was defo an issue on the 37"
may have carried on to the 40" as well

tobi1:
Hey all,

well it was a good attempt.

I found cracking at the Bridge rectifier legs. I also found a few other solders that looked suspicious so I decided to re-solder those.

I also tested a couple of the resistors and diodes. Zomikula, I couldn't find a DP805. There's DP804, DP806 & DP810 and all these were fine (constant reading only in one direction).

I cleaned the board (IPA) and put it back together and then BOOM.

So the fuse popped again and this time the resistor NT8125 (photos below) decided to explode too!

I presume if I replaced this resistor then the same explosion would happen again because of a problem somewhere else on the board? I don't like giving in so if any of you may know where I've faultered please let me know. Otherwise I'll concede defeat.

Thank you all for your help up to now as well!

Toby

Potential cracking


What went boom

Turnip:
Hi Tobi 1

Suspect exploded thing is a resistor, where when it heats up, it's resistance falls - Sort'a soft start.

Also suspect you gave it a hard start with a short in the P/S primary.

One useful way is to use maybe a 100 watt bulb in series with the mains input - If it glows brightly and doesn't go out after a few seconds, you've got a short.

Some shorts are only evident with voltage applied so you can measure around in 'relative safety' if you can't suss it cold - Chris.

Navigation

[0] Message Index

[*] Previous page