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Old 09-13-2012, 04:05 PM   #1
RuffRhyno
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Angry 2007 Samsung LN-S4095D won't power on.

I bought my Samsung lcd in March 2007 which means it was probably manufactured in 2006. I was watching Netflix when the tv flickered on and off as if it was being reset during a power brown out. There were brief artifacts on the screen and my home theater system displayed the HDCP ERROR message. Sound kept working, but the video wasn't coming back. It did this 2 or 3 more times over the next 5 minutes until it just wouldn't power back on anymore.

When pressing the power button on the tv, nothing happened. When pressing power on the remote, the light next to the power button would blink on the tv but again it wouldn't turn on.

After searching online I saw the common problem being the capacitors. Once I removed the cover and exposed the power board, I couldn't see any apparent issues with the capacitors. No bulging, leaking, etc. There was one capacitor that had black smearing on the top that looked like magic marker, but I remember seeing that can be leakage. So, I removed it. Upon close inspection of the capacitor, there is no swelling or damage to the top, I'm wondering if it was drawn on. I marked that capacitor in the first pic.

In the second pic, focusing on the upper right corner of the board which is a common problem area in other Samsung tvs, the caps seem ok, but there is one cap that seems to have a different substance on its surface than the one directly near it. They are wrapped in some sort of sleeve, so I can't tell what exactly they are. The only marking it has is that it is rated at 105 C. Could that be a problem as well?
Attached Images
File Type: jpg IMG_1301.jpg (616.4 KB, 15 views)
File Type: jpg IMG_1299.jpg (535.7 KB, 14 views)
File Type: jpg IMG_1294.jpg (637.3 KB, 12 views)
File Type: jpg IMG_1297.jpg (440.0 KB, 13 views)

Last edited by RuffRhyno; 09-13-2012 at 04:08 PM..
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Old 09-13-2012, 04:42 PM   #2
retiredcaps
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Default Re: 2007 Samsung LN-S4095D won't power on.

Quote:
Originally Posted by RuffRhyno View Post
There was one capacitor that had black smearing on the top that looked like magic marker, but I remember seeing that can be leakage.
That is likely black felt marker from the factory.

Quote:
They are wrapped in some sort of sleeve, so I can't tell what exactly they are. The only marking it has is that it is rated at 105 C. Could that be a problem as well?
If it is marked LM852 on the board, "L" is usually an inductor and they rarely go bad.

http://en.wikipedia.org/wiki/Electro...e_designations

http://en.wikipedia.org/wiki/Inductor

Do you have a multimeter and know how to measure DC voltage? If yes, what are the DC voltages on the two connectors in the corner? List them like so,

legend-silkscreen my reading
pin GND = 0
pin 5V SB = 5.034
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Old 09-13-2012, 05:54 PM   #3
sam_sam_sam
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Default Re: 2007 Samsung LN-S4095D won't power on.

In the photo that you have the one on left which I am going to say in #1 it looks like this may have cap pop it top

If I was working on this set and had it 5 years already I would check ALL CAPS with a ESR cap tester if you do not have one I would replace
ALL of the caps on that board with FC type caps

If you run this TV set like I run mine it ON for at least 12 to 14 hours a day and some time more than that

There is not that many caps on this board

http://www.digikey.com/product-searc...luminum/131081

In the search pick FC Type


Series = FC

Manufacturer

Capacitance = The value that you want
Voltage Rating = The value that you want
Tolerance

Lifetime @ Temp.

Operating Temperature = This will be 105
Features = General Purpose

Ripple Current

ESR (Equivalent Series Resistance)

Impedance

Mounting Type = Through Hole
Package / Case

Size / Dimension = The value that you want if you know the size

Height - Seated (Max) = The value that you want if you know the size



Lead Spacing

Surface Mount Land Size

Packaging


I hope this helps
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7 PC LCD Monitor
2 LCD Flat Screen TV
20 Desk Top Switching Power Supply
5 Desk Top Power Supply
5 Battery Charger Switching Power Supply for Power Tool
1 Battery Charger Power Tool Power Supply
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply
1 XBox 360 Mother Board
1 De-soldering Station Switching Power Supply & 1 Power Supply
1 Dell Mother Board
3 Computer Power Supply
1 HP Printer Supply & Control Board


These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps

Last edited by sam_sam_sam; 09-13-2012 at 06:42 PM..
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Old 09-13-2012, 06:48 PM   #4
budm
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Default Re: 2007 Samsung LN-S4095D won't power on.

Can I see the whole back side of the TV to see how all the boards are connected together?
On the first picture, there is a small connector on the top left of the board, next to it there is label indicating the function of each pin. Can I see that picture?
On CN801, there is a pin with 'ON/OFF', can you take the DC voltage reading when the TV is off and when the TV is turn on by the power switch, I want to see if the voltage is toggling at that ON/OFF pin.
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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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Old 09-13-2012, 06:58 PM   #5
retiredcaps
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Default Re: 2007 Samsung LN-S4095D won't power on.

Quote:
Originally Posted by sam_sam_sam View Post
If I was working on this set and had it 5 years already I would check ALL CAPS with a ESR cap tester if you do not have one I would replace
ALL of the caps on that board with FC type caps
@sam_sam_sam

Capxon makes terrible quality caps and while I would agree with your suggestion to recap in general (after there is some evidence the caps are at fault), the suggestion of using FC may not meet the original caps' ESR.

Panasonic makes FM/FR which has better ripple and ESR characteristics compared to FC.
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