Hi!
The problem:
My son's LCD ceased to work a week ago, he was watching some cartoons on it when suddenly it powered off, power led went off. I did not see smoke, but I could smell it in the air.
What I've done so far:
After I disassembled it, i saw burn marks under the IC marked U320.
Also thought, while I'm at it, i'll change all the capxons to some higher quality ones. Desoldered them all, and just for curiosity I measured capacitance in all of them. C661 or C662 was half the rated capacity, and couldn't get a reading on the big cap, so I guess that was bad too. Tried to find rubycon/panasonic/other high quality caps, but for some values I only found samwha and hitano in my local shop. Anyway, I changed them all to new ones.
Changed the burned IC (it was a TOP246FN), also F110 fuse was blown, so changed that too to an identical one.
Still not powering on, I can't get 13V or 5V reading on the output side, I have ~330V on the big cap tho.
Any ideas what to test next?
I'm thinking bad diodes, in that case which one should I start with?
Thanks in advance.
The problem:
My son's LCD ceased to work a week ago, he was watching some cartoons on it when suddenly it powered off, power led went off. I did not see smoke, but I could smell it in the air.
What I've done so far:
After I disassembled it, i saw burn marks under the IC marked U320.
Also thought, while I'm at it, i'll change all the capxons to some higher quality ones. Desoldered them all, and just for curiosity I measured capacitance in all of them. C661 or C662 was half the rated capacity, and couldn't get a reading on the big cap, so I guess that was bad too. Tried to find rubycon/panasonic/other high quality caps, but for some values I only found samwha and hitano in my local shop. Anyway, I changed them all to new ones.
Changed the burned IC (it was a TOP246FN), also F110 fuse was blown, so changed that too to an identical one.
Still not powering on, I can't get 13V or 5V reading on the output side, I have ~330V on the big cap tho.
Any ideas what to test next?
I'm thinking bad diodes, in that case which one should I start with?
Thanks in advance.
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