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Old 09-10-2019, 02:14 PM   #1
todd321
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City & State: Vác, Pest
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Default Dell 2412m picture problem

Hello!

I need some help with my Dell 2412m 24" monitor with the display failing shown on the video below.

https://youtu.be/9Uaw_PDpr4o

I'm not really familiar with flat panel displays, so feel free to correct me.

This monitor has an LG LM240WU8-SLA1-611 t-con(?) board, and a 4H.1GH01.A00 scaler board(?).
I have created a list of voltages measured on the t-con(?) panels test points. No idea what SOE, POL, FLK1 and FLK2 are.

Pin Voltage
VLCD 16,142V
VCC 3,295V
VGL -4,2V fluctuating approx. 400mV
VGH 25,2V
VCOM_L 6,406V
VCOM_R 6,406V
POL 1,639V
SOE 0,395V
FLK1 2,402V
FLK2 3,278V

VST -3,6V fluctuating approx. 400mV
VDD_O from 25V to -4V jumping
VDD_E from 25V to -4V
V1 15,144V
V2 14,505V
V3 12,446V
V4 11,369V
V5 10,253V
V6 8,475V
V7 7,954V
V8 7,516V
V9 7,005V
V10 5,219V
V11 4,074V
V12 3,022V
V13 0,946V
V14 0,318V

Can anyone point me into some directions where to look? What I found a bit strange is the VGL voltage, I checked it with a scope.

https://photos.app.goo.gl/cwv5aGG1Q3KVWH7b7

Last edited by todd321; 09-10-2019 at 02:18 PM.. Reason: Added photo album link
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Old 09-10-2019, 05:09 PM   #2
todd321
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Default Re: Dell 2412m picture problem

Found out that SOE is source enabled, POL is for polarity, FLKX is flicker control.
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Old 09-18-2019, 09:09 AM   #3
captainKKK
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Default Re: Dell 2412m picture problem

What voltages are listed on the COF IC datasheet? Likely VGL should be around -6 and VGH around + 25. Have you checked all the fuses? My guess is going to be US1, but it's only my guess.

Last edited by captainKKK; 09-18-2019 at 09:19 AM..
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