So a friend brought me his dead Samsung last night. When powered up no light on the screen except for a few sparkles and it keeps turning on and off. Anyway long story short found a blown bottom bottom buffer board. remove the board and applied the test pattern and when the screen gets to the red test it shuts off and restarts. Mainboard appears dead as nothing is on the screen when the test pattern is not enabled. What I have found is what appears to be a popped IC on mainboard. It's an 8 pin z102hai location IC207. This looks to be a voltage regulator of some type. Anyone successfuly replaced . this with success?
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Did I leave the soldering iron on? -
Re: Samsung pn58b650 mainboard issue
Welk I found a z102hai from another parts board. Still nogo.Did I leave the soldering iron on? -
Re: Samsung pn58b650 mainboard issue
Can we see a picture of the failed regulator?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Samsung pn58b650 mainboard issue
Here is the IC. Its a little scared up from pulling it with a pair o f tweezers but you'll see the hole in it. Replced it from another samsung but it was a 50" with a bad screen. Still does the same thing no picture and power cycles on and off. But I can get test mode to come up on logic board.
http://i845.photobucket.com/albums/a...ps5fadef10.jpgDid I leave the soldering iron on?Comment
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Re: Samsung pn58b650 mainboard issue
Jumper PS-ON to GND with 100 ohms, VS-ON to 5V standby with 100 ohms, remove LVDS and jumper 3-4 on logic board. Patterns should repeat indefinitely.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Samsung pn58b650 mainboard issue
Oh and I removed the faulty buffer IC. Bottom of the lower buffer board. Going to order a replacement. Its a panasonic AS16489A. Never had a panasonic IC fail yet. Oh well.
at first I was thinking maybe the buffer bird failure had caused something to happen to the mainboard but I don't see how that's possibleat least I have seven eighths of the screen now.Did I leave the soldering iron on?Comment
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Re: Samsung pn58b650 mainboard issue
Yep. Jumped the connections and it stays on with test patternsDid I leave the soldering iron on?Comment
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Re: Samsung pn58b650 mainboard issue
Any ideas what might be the issue with this mainboard before I just purchase another one? Does anyone have a schematic on it? Part Number is BN94-02855FDid I leave the soldering iron on?Comment
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Re: Samsung pn58b650 mainboard issue
well I am on a rant. Mainboard issues not an issue anymore I replaced it with a new one. But as for the buffer boards go why is it that I have bought two separate boards on eBay from two seperate sellers and both of them are shorted? Don't people test board's before they send them out I mean it's easy you put the black lead on the ground in you run the red lead along the buffer output to the panel and if you get a beep it sure did unbelievable. and also when you have a cracked screen why do people plug them in anyways to see if they still work cause that's what kills these boards immediately. I mean a cracked screen is a cracked screen. I wouldn't be buying these use boards if the sellers weren't saying that they have been 100 percent tested! obviously they have been 0 percent tested!Did I leave the soldering iron on?Comment
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Re: Samsung pn58b650 mainboard issue
You get this all the time.
Here, at least I test MY buffers before I sell them (though I don't sell too many parts myself.)
https://www.youtube.com/watch?v=51SZsfH60EYPlease do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Samsung pn58b650 mainboard issue
Well I just took two and made one good one. lolLast edited by freakaftr8; 10-31-2013, 06:23 PM.Did I leave the soldering iron on?Comment
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Re: Samsung pn58b650 mainboard issue
Tv works fine now. Removed a good ic from a dead board and installed it on my buffer board.Did I leave the soldering iron on?Comment
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