Electronics > Repair

Samsung 32" S32D850T Monitor Repair story

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remaker:
Some further (unhappy) updates.

At this point, I was thinking about cracked solder joints. I resoldered a number of places and even ran a heat gun all over the power supply board to reflow. Still no joy.

Often, a sharp mechanical jolt to the power board will restore it to operation, which had me focused on the solder joints.

The AC side of the rectifier is always fine when in failure mode, but the voltage on the far side drops precipitously when failing. I didn't make notes, just going from memory here.

I used a Kill-A-Watt that shows power draw 55W when working, drops all the way to zero when failing. All LEDs off when failing, front panel unresponsive.

I'm wondering is there is some hairline crack on a trace or something. The board routing tolerances look very right, with some thin traces running under very small 0201 zero ohm resistors.

Nothing obvious has jumped out at me. Lot of posts about failing this supply and whole power supply replacements are expensive and likely to meet a similar fate. Seems like a design issue.

m k:

--- Quote from: remaker on March 04, 2024, 09:34:18 am ---The AC side of the rectifier is always fine when in failure mode, but the voltage on the far side drops precipitously when failing. I didn't make notes, just going from memory here.


--- End quote ---

What you mean by far side?

Normal diode bridge rectifier can't drop DC if AC is not dropping.
Or can but then it would be a shunt of some sort.

SeNat:
Hi, I have the exact same problem as you with the same monitor. Please let me know have you found a solution?

joespeers:

--- Quote from: sausage on February 14, 2021, 11:50:35 pm ---I assume this is the place to share repair stories as well? If not I'll have it removed. Fixed and blogged about the repair over the weekend:

http://blog.waynejohnson.net/doku.php/s32d850t_monitor_repair

--- End quote ---

Thank you, followed this and fixed my monitor, the problem was exactly the same for me.

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