Re: Samsung Model TV LN40B630N1 No Picture
$80 (incl shipping for the PSU/Inverter and $112 plus $29 shipping for the main board. I felt like I got hit by a lightning surge. 2 years ago I replaced the TCON board. Doesn't say much for Samsung reliability. They have a 6 month warranty on the board repair where they pay the shipping both ways. Moduslink PTS in Bloomington, In. Turnaround was less than a week each time.
Pros: Board were repaired professionally. TV now works.
Cons:
- First time with PSU, not repaired (No voltages out)
- Sent back PSU with...
cfuller201
Member
Last Activity: 08-19-2013, 11:12 AM
Joined: 08-03-2013
Location: Canton, GA, Masters of EE, Universiy of Florida
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Re: Samsung Model TV LN40B630N1 No Picture
Display is now perfect.Leave a comment:
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Re: Samsung Model TV LN40B630N1 No Picture
Received Main board back from repair and installed. Display is perfect before I fixed the power supply board and main board.
Final report. Thanks for your inputs.Leave a comment:
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Re: Samsung Model TV LN40B630N1 No Picture
When I get these 2 boards back, can I power up without the tcon board. What would I get on the screen? Thanks. Or should I put all boards back in and power up?Leave a comment:
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Re: Samsung Model TV LN40B630N1 No Picture
ModusLink PTS repaired the PSU/Inverter board. They suggested I send back the PSU and Main board for testing and Repair. I UPS'd to them today. Couldn't find any schematic on the Main logic board. Think Problem is with the INV ON/Off Pin from the main board. I'll let you know what happens.Leave a comment:
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Re: Samsung Model TV LN40B630N1 No Picture
Thank you. I will put back together and try this.
In the meantime, can someone tell me which of these signals on the power supply connector comes from the main board to light up the video. Pin 23 inv_on/off seems like a good candidate. That is when I disconnect the psu connector I get the backlight screen lit up. Thoughts"Leave a comment:
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Re: Samsung Model TV LN40B630N1 No Picture
The TV went out during a heavy rain/lightning storm. BTW I have a Masters of Electrical Engineering from the University of Florida. For $50 a tech will diagnose problem but typically replacement boards are very hard to find. We have 8 LCD TVs in the household so I want to get better at fixing.Leave a comment:
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Re: Samsung Model TV LN40B630N1 No Picture
No and NOLeave a comment:
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Samsung Model TV LN40B630N1 No Picture
New Member. First Request for info
TV Symptoms: When plugged into 120 V AC, front panel power on light is solid red. No picture, no sound, no backlight, lcd panel is black. When I unplug cable to Main board (BN41-01149A) from PSU/Inverter (BN44-00264A) backlight comes on completely and all voltages I measured are present. So my guess is there is a problem with Main PCB or TCON.
Question: How to troubleshoot which one to replace. 2 years ago I replaced the TCON board.
Samsung Model: LN40B630N1F
Model Code: LN40B630N1FXA
Manufactured: 2009
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Re: New Members - please post your introductions here
Hello. My name is Clark Fuller. I came to this blog because of my interest in fixing LCD/LED TVs for me and my friends.
I am a retired electrical engineer via University of Florida circa 1961.Leave a comment:
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