lin4sm
Senior Member
Last Activity: 09-06-2024, 09:10 AM
Joined: 09-12-2011
Location: United Kingdom
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It was very long time ago. Most likely I have bought 2nd hand part for this TV. -
Re: LG 55EC930V OLED Is panel OK?
I've got test pattern when turned power supply on. Did not do test points.
I get green, red, blue, white, black screen. All colours has specific distortion, see attached photos.
[ATTACH]204534[/ATTACH] [ATTACH]204535[/ATTACH] [ATTACH]204536[/ATTACH] [ATTACH]204537[/ATTACH]Re: LG 55EC930V OLED Is panel OK?
I've got test pattern when turned power supply on. Did not do test points.
I get green, red, blue, white, black screen. All colours has specific distortion, see attached photos.
...Last edited by lin4sm; 12-23-2019, 06:10 PM.Leave a comment:
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Re: LG 55EC930V OLED Is panel OK?
I haven't used external power supply. It would be more convenient, but... thanks for letting me know.
Had some food. Now I am happy to proceed with testing.Leave a comment:
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Re: LG 55EC930V OLED Is panel OK?
I want to double check that I would not make mistakes.
In the photo I have market where I will connect 12 V.
And I will need to test screen on pins that I have marked in red square, am I right?
Is it OK to use external power supply for 12V?
[ATTACH]204528[/ATTACH]...Leave a comment:
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Re: LG 55EC930V OLED Is panel OK?
I have small workshop in my house.
There is an old oscilloscope in my storage. I do not know if it is still working. Never used it just turned it on once 3 years ago. I did forgot a little how to use it as last time used it 15 years ago in University.
I can try something with it only tomorrow afternoon.Leave a comment:
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Re: LG 55EC930V OLED Is panel OK?
Tried with LG remote to turn on TV and with phone pressing IN_STOP command.
No difference. Still same clicking.
Ar you sure that its main board fault? When yesterday I did tests, screen had white line.Last edited by lin4sm; 12-23-2019, 01:58 PM.Leave a comment:
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Re: LG 55EC930V OLED Is panel OK?
Tried my luck pressing IN_Stop 100-200 times. TV does not react to this command. Tried both apps. One that I have and you've sent. No difference.
I have tired this command on other LG TV. It did not start that TV too. I had to turn TV on to activate this command. But its other LG....
Are you sure that In-Stop command should start TV?...Leave a comment:
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Re: LG 55EC930V OLED Is panel OK?
Remote came with TV AKB73975761.
Could you please guide me how to use In_STOP command?...Leave a comment:
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Re: LG 55EC930V OLED Is panel OK?
I do not know
When TV is plugged in to socket I get barely lit grey LG logo.
Turning TV on relay clicks logo lights up when relay clicks again logo fades out no more light on it. If pressed once again power button logo lights up and fades into no light.
Exactly same behaviour when LVDS cable disconnected....Leave a comment:
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Re: LG 55EC930V OLED Is panel OK?
Tried power only button.
P201 same voltages as previous test.
P201 I get 24.1 V for a 1 second then drops to 0 V.Leave a comment:
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Re: LG 55EC930V OLED Is panel OK?
When I was reading 12 and 24 volts without main board doing SMPS testing.
P201 11.9 V and 24.6 V. P202 24.1 V. P202 after some time with car bulb dropped to 24V exactly.
When all cables connected I get different readings.
P201 11.8 V, 25.2
P202 1.2 V
Panel or t-Con drawing too much power?Leave a comment:
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Re: LG 55EC930V OLED Is panel OK?
Did as you said. Power button on TV. Tried all 4 HDMI from YouView box. I could not hear a sound....Leave a comment:
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Re: LG 55EC930V OLED Is panel OK?
Tried all 4 HDMI connections. No sound.
What I have noticed when I turn on TV I can see red light in optical port.
If LVDS is connected it stays on 1 or 2 seconds longer compared to disconnected LVDS.
I've been using POWER ONLY button on service remote. After using this option on other LG TV it switched to analogue TV. So it should be same on this OLED. In that case I have to change input to HDMI to get sound an I right? TV does not respond to remote as it goes to protection mode.
Tried...Leave a comment:
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Re: LG 55EC930V OLED Is panel OK?
UC18 was under silicone thermal pad. Marks on chip are from the pad.Leave a comment:
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LG 55EC930V OLED Is panel OK?
I've bought faulty OLED TV. When pressed power button it Powers on for 2-3 seconds. Relay clicks for on and then off click. LG logo fades out.
Checked power supply according to OLED SMPS Testing manual.
All voltages fine. Bulb test fine.
Installed MyRemocon on android device with IR. Pressed "power only" button. Got same cycle like with normal remote.
Inspected LVDS and can 4 cables that goes to panel. Panel cables as new. LVDS contacts slightly discoloured. Cleaned with contact cleaner and brush. No changes.
As member Diah offered disconnected middle two... -
Re: UN55B6000VF white screen with disconnected T-Con
Most probably you will need to replace some of the SMD caps as from photos I can see that they are damaged by corrosion. Ribbon cable that connects board to screen will have to be cut slightly (just not too much) approximately 1 mm. All traces have to be connected back together where corroded. Tiny wire can help connecting them. SMD components that are not damaged should be reflown I do this this with solder iron and a lot of flux. It is job that requires precision and skills, possible to repair. Had tree TVs like that 2 managed...Leave a comment:
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Re: No picture Samsung LE40R88BD BN41-00813E
Power supply is fine. All caps are within range and ESR still good on them.
Main board programs blank eeprom chip with default settings.
Somehow forgot to do this on this board and was scratching head for solutions.
Newer Samsungs do not have this easy fix any more.Leave a comment:
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Re: No picture Samsung LE40R88BD BN41-00813E
Issue solved. Just now remembered that I have not replaced eeprom IC1803 chip just in case.
Soldered new blank chip in and its working fine!Leave a comment:
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Re: No picture Samsung LE40R88BD BN41-00813E
Haven't tried vga, do not have anything to connect right now. Other sources SCART and HDMI are same - blank screen.Leave a comment:
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No picture Samsung LE40R88BD BN41-00813E
I have Samsung LE40R88BD TV. No picture.
Problem have been isolated to the main board. With other main board TV is working fine. No problems at all.
So with this main board have sound, backlight is working. No picture. Totally black screen. 12V to T-Con board is supplied.
Where should I be looking for problem?
Attached two photos of the main board.
BN41-00813E BN94-01472M....Last edited by lin4sm; 08-12-2016, 06:18 AM.
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