Re: Need help with Samsung LN40E550f7f
http://www.shopjimmy.com/samsung-bn4...upply-unit.htm look closely is this your power supply?
http://www.shopjimmy.com/samsung-bn4...upply-unit.htm look closely is this your power supply?
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Re: Need help with Samsung LN40E550f7f
You have the correct Voltages but it is missing the BL-ON signal from the main board to turn on the backlights circuit, the power supply board may have pull-up resistors for the control signals pins to allow self test of the power supply board, do unhook the cable from the power supply board to the main board then pug the TV into the outlet to see if the backlights will come on and stay on as long as the TV is plug in or not.
If the backlights do not come on then you need to report the Voltage readings on that connector of the power supply board again (without it connecting to the main board), the reading will tell us if the power supply board has pull-up resistors or not.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: Need help with Samsung LN40E550f7f
You have any dark lines spanning horizontally in the screen?
Just fixed one of these suckers the other night. 3 bad CCFL tubes. Usually represented with picture may or may not come on briefly but you can see with a flashlight. This model probably has pull up resistors so the CCFLs will come on if you disconnect the main board from the power supply.
If it does not look towards an inverter or CCFL failure.Did I leave the soldering iron on?Comment
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Re: Need help with Samsung LN40E550f7f
BTW, your power supply board is not the typical power supply-inverter combo board.
The board has the Inverter transformer driver circuit with MOSFETs on the power supply board, they supply high frequency AC to connector CNI801 pin 3 (LOW 193VAC) and pin 1 (HIGH 373VAC) of the power supply board to drive the Primary winding of the Inveter transformers on the Inverter transformer board, CNI801 also supplies 12VDC (which you report as present) to run the protection circuit on the Inverter transformer board.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: Need help with Samsung LN40E550f7f
https://www.youtube.com/watch?v=Z1DEkSguWtg testing boards and troubleshooting.Comment
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Re: Need help with Samsung LN40E550f7f
http://www.shopjimmy.com/cmo-27-d070...t-inverter.htm probably time to test inverter, you have two right, so if they both test the same, they might both be good. then it's looking more like a bad ccfl/lamp.Comment
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Re: Need help with Samsung LN40E550f7f
"6.blu_on -0v"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: Need help with Samsung LN40E550f7f
Sorry all,..internet went down again yesterday all afternoon and night. Grrr. Back at it now. Reading through my responses.Comment
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Re: Need help with Samsung LN40E550f7f
Yea but at least it was only a 40 inch. Try removing an LCD from a 75 or 80 inch by yourself. Smh.
The one I worked on had a constant blu-on so maybe this one could be inverter related.Did I leave the soldering iron on?Comment
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Re: Need help with Samsung LN40E550f7f
Ok not sure but is this the type you can jump ps on blu on and standby together to start up the power supply board?Comment
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Re: Need help with Samsung LN40E550f7f
So if you jumper blu on and standby the backlights should go on and stay on, correct?Comment
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Re: Need help with Samsung LN40E550f7f
https://www.youtube.com/watch?v=n54IurMvr6o here's a video explaining the jumper procedure.Comment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
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Hey everyone,
This power supply board is hard to find but there are repair kits available. This board had a blown fuse, FP801S, blown PFC MOSFET, QP802CS and ceramic cap, CP809. I replaced them with parts I already had and tested the rest of the parts that would've come in the repair kit and they were fine. I powered the board up on the bench expecting, in typical Samsung power supply board fashion, to see all my output voltages but, nothing. 0 volts on CNL801, CNM801 and CNT801. The only thing I have is 170vdc on the filter caps. No standby voltage either.
Anybody... -
I did not have any 27uf @ 50 volt capacitors but one nice thing is that it has enough room for two capacitors in parallel a 22uf and a 4.7uf @ 50 volts 22 plus 4.7 equals 26.7uf which so very close to 27uf I will show some pictures of it sometime tomorrow
This is one of the shit est boards I seen in a very long time and it was the daughter board the traces just lifting off the board I had to use the capacitor leads to repair the the traces and the main board is not any better because I had to repair several traces for the daughter board to the main board
After all of... -
I am attempting to test a samsung power supply board to verify the pfc ic is working. I am powering up the board with my isolation transformer. The board turns on fine but when I attempt to connect the ground for the scope probe, it trips out the isolator. I was taught not to 'float my scope' so I am wondering if I should test without connecting the ground lead or would that be asking for trouble? Not sure how else to test, I don't have a portable scope. I could plug direct to mains power but that would bypass the safety factor.
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Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic...
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