Wednesday, August 3, 2011
Repairing Another Samsung LCD TV
This Samsung LCD TV (model LNT4065FX/XAA) was having a number of problems including taking 30-45 seconds to power on and sometime showing purple lines on the display when first turned on (see blog post about it with pictures CLICK HERE). After contacting Samsung through their on-line form, I was contacted days later by a service person. He did not think the problem was caused by capacitors but was instead the display controller board. Well, apparently not. The repair took about 30 minutes but capacitors had to be ordered on-line, they were $0.91 a piece. After the repair, the television turned on it about 5 seconds and no recurrence of the purple display issue.
See this entry about another Samsung LCD TV that needed a similar repair: CLICK HERE
UPDATE (Feb. 2012): Samsung has listed a settlement for this problem on their web site: http://www.samsung.com/us/capacitorsettlement/
Tools I used to make this repair: Philips screw driver, Weller soldering iron with stand, desoldering tool, wire cutters, and solder
This next picture shows the cluster of capacitors causing the problems.
The green arrow points to the area of the power supply board the capacitors were found on.
The next two pictures show the 1000 uF 25 V SAMWHA electrolytic capacitor with bulging tops. Note the small brown spots on top of two of the capacitors.
Last two pictures are of the repaired board with Panasonic capacitors.
Picture of underneath circuit board before the capacitor leads are clipped.