Hello all. Currently trying to fix my nieces tv. Has no video. She did her own research and did the flashlight test. then ordered a replacement inverter. I installed it, however it did not fix the problem. There are no swollen caps. I suspicion the power supply board, but I need a schematic or other assistance in testing. Yes, I have a multimeter and a usb oscilloscope however, I don't know how to use the oscilloscope yet. Have searched and searched for service manuals, schematics, etc. to no avail. The power supply board is a BN44004400B. Thanks!
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Need help with Samsung LN40E550f7f
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Re: Need help with Samsung LN40E550f7f
pretty smart niece to figure that out it could be the inverter board. However for your board is a PSU repair kit at SJ available that fixes: The Samsung BN44-00440B Power Supply Component Repair Kit includes all necessary components to repair common failures on the Power Supply. Symptoms include will not turn on, no backlights, missing 5V standby or PFC.
http://www.shopjimmy.com/samsung-bn4...repair-kit.htm
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Re: Need help with Samsung LN40E550f7f
So what Voltages do you have on the connector of the power supply board that goes to the main board when TV is in standby and when power switch is activated?
You MUST report the pin name and follow by the Voltage reading for each pin so we can see if they are correct or not.
We also need good clear the pictures of YOUR whole power supply board.Last edited by budm; 02-19-2018, 06:19 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=24809
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Re: Need help with Samsung LN40E550f7f
Exercise caution when testing power supply board, it can be deadly. there are legends like little maps on the power supply board that tell you what voltages to expect from the connector pins, put negative lead on ground like the chassis for example, also check those 2 fuses if you haven't, I check those fuses with tv off and unplugged. The voltages have to be checked with tv on or plugged in of course.Last edited by nomoresonys; 02-19-2018, 09:42 PM.
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Re: Need help with Samsung LN40E550f7f
Voltages are as follows both on the power supply as well as the lead in to the logic board:
Power supply:
Pin 1=5.17
2= 5.17
4= 12.78
5.=12.78
6.=12.78
7.=12.78
At Logic Board= same
Lead to inverter:
pin 10= 12.07
pin 2= 12.76
At Inverter: Same
Any not listed had value of 0.
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Re: Need help with Samsung LN40E550f7f
Originally posted by nomoresonys View PostExercise caution when testing power supply board, it can be deadly. there are legends like little maps on the power supply board that tell you what voltages to expect from the connector pins, put negative lead on ground like the chassis for example, also check those 2 fuses if you haven't, I check those fuses with tv off and unplugged. The voltages have to be checked with tv on or plugged in of course.
I found the voltages on the board. - Not easy to read!
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Re: Need help with Samsung LN40E550f7f
1) No pin names to tell us what each pins are.
2) There are 14 pins on that power supply connector that goes to the main board but you only report 7 of them and without the pin names as requested then those reported numbers are just about meaningless.
3) Samsung BN44-00440B power supply board?
4) You need to follow the instructions.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=24809
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Re: Need help with Samsung LN40E550f7f
Originally posted by Kindred1 View PostThank you for the warning. I actually have done a lot of computer work and 3 t.v.'s so far. I learned my lesson on things holding a charge years ago.
I found the voltages on the board. - Not easy to read!
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Re: Need help with Samsung LN40E550f7f
http://www.shopjimmy.com/samsung-bn4...upply-unit.htm is this your power board? you may have gotten a bad tcon board, hard to tell, I see shopjimmy has 1 for 10 bux. oops my bad you said inverter not tcon.Last edited by nomoresonys; 02-20-2018, 08:54 PM.
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Re: Need help with Samsung LN40E550f7f
Does this tv have a metal back cover? if so are there any burn looking marks on it, like where the power board is etc. just worked on a sammy ln40c650, you can check my thread if you care to, but take your time, I double and triple checked everything before proceeding, you may have a whole different issue of course.
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Re: Need help with Samsung LN40E550f7f
No scorch marks. 450v caps read 375v. Everyone is talking about standby mode; on this t.v. , when is off, the indicator light stays red and I have no readings. If I turn it on, it chimes, the light flashes and then goes off. After several minutes, it shuts off.
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