Re: Samsung LN52A650A1FXZA dead, standby LED just flashes repeatedly
1k ohms, on the good and the bad board. You're talking about these 2 right?
1k ohms, on the good and the bad board. You're talking about these 2 right?
Attached Files
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Last edited by kevinm34232; 10-05-2017, 03:05 PM. -
Re: Samsung LN52A650A1FXZA dead, standby LED just flashes repeatedly
If that 3.3V regulator output is the one that feeds the input of 1.8V regulator then the one you measure resistance between the output of one regulator to the input of another regulator then it cannot be 1K resistance between the two pins.
Need to find the schematic of that main board to find out where that 1.8V regultor gets its input Voltage from. May be start check the resistance between the input of that 1.8V regulator and output pins of other regulator to see which one shows < 1 Ohm.
You can try downloading these service manuals:
http://elektrotanya.com/?q=showresul...oria=&kat2=all
BTW, what is the designator number for that 1.8V REGULATOR IC? U???, IC?????Last edited by budm; 10-05-2017, 09:07 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Samsung LN52A650A1FXZA dead, standby LED just flashes repeatedly
Yes the 3.3v regulator is IC901, 1.8v regulator is IC1103 and has 2.4v at input.Attached FilesComment
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Re: Samsung LN52A650A1FXZA dead, standby LED just flashes repeatedly
The input pin of IC1103 leads back to pin 3 of IC101 (MP1583DN)
http://www.monolithicpower.com/Deskt...ocument?id=238
NM I replaced this IC voltages normal but still same problem thanks for the help..Last edited by kevinm34232; 10-06-2017, 08:45 AM.Comment
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Re: Samsung LN52A650A1FXZA dead, standby LED just flashes repeatedly
OK, so the input Voltage of 1.8V regulator IC1103 is not fed by the other 3.3V regulator IC901, the input comes from switching regulator generated by IC101.
Did you download the service manual? May be IC101 feedback circuit is the problem.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.
Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today.... -
Hi. I got a Vizio with no power or standby, and won't turn on with remote or button. I checked the voltages on the connector and all read 0.00V or nearly 0(0.050 ON/OFF pin). None of the pins are labeled STB for standby although I do see some 5V pins. Other than the obvious standby led, which isn't coming on, is there a way to check for standby voltage on this PS. I'm trying to see if my problem is the PS or mainboard. Some Vizios I have fixed with no standby led me to think it was the PS but it turned out being the mainboard. Any experience with this set would be greatly appreciated. -
A) TV initially dead
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E) Powered back on and it now runs for a few minutes before relay clicks, screen goes blank, Main Board Red Digital Optical... -
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If power has been disconnected for 5 minutes, the tv turns on fine, until turned off and left for a couple minutes, as the standby light will then turn off again.
I've seached and found that this is most likely a failing PSU, and I've seen repair services on eBay fixing these symptoms, so I am hoping that someone here has fixed... -
I am working on a QN750Q8FNBFXZA. Dead except the standby light. It blinks what appears to be 1 3 1 2. 1 long blink, pause, 3 short, pause, 1 long, pause, 2 short, pause, repeat. A service manual would be very helpful, or if anyone knows these error codes. Thanks!
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