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tofubazille
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Last Activity: 01-28-2022, 04:31 PM
Joined: 04-02-2013
Location: Vienna
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  • tofubazille
    replied to DELL U2412Mb - defective Logic Board, black screen, backlight on
    in Troubleshooting Computer Displays
    Re: DELL U2412Mb - defective Logic Board, black screen, backlight on

    The picture in the attachment shows the 0Ohm resistor.

    Edit: Ok, just switched positions of the 0Ohm resistor and removed the 1,5kOhm Resistor and .... the monitor is back to life! Problem solved!

    Just for clarification: The PCB layout is indeed 4H.1GH01.A10 but the assembly is 5E1GH01004 for the 5V panel and 5E1GH01005 for the other voltage. The assembly version is written on a small sticker in the back of the PCB....
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    Last edited by tofubazille; 07-20-2018, 12:29 PM.

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  • tofubazille
    replied to DELL U2412Mb - defective Logic Board, black screen, backlight on
    in Troubleshooting Computer Displays
    Re: DELL U2412Mb - defective Logic Board, black screen, backlight on

    Though both Logic Boards have the same model number AND same revision there is a minimal difference: on my working board there is no SMD resistor of 1.2kOhm (R103, the one with 152 written on it) connected to the Vin pins 28,29,30 of the LVDS connector. What's the reason?

    Oh, another difference... at position R144 there is a 0Ohm resister on the new board, on the working board it is placed at R143. Looks like the Logic Boards are using different voltages for the panel!
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    Last edited by tofubazille; 07-20-2018, 11:35 AM.

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  • tofubazille
    started a topic DELL U2412Mb - defective Logic Board, black screen, backlight on
    in Troubleshooting Computer Displays

    DELL U2412Mb - defective Logic Board, black screen, backlight on

    Hi!
    I've got a problem with my DELL U2412Mb. The logic board has been grilled via USB in a power outage, all caps had 0Ohms and some SMD components were grilled.
    Only option was to buy a new board.

    I've got another working DELL U2412Mb here, so before I ordered a board from ebay, I cross checked which part is broken with parts from my other working monitor and it is the logic board. There's no chance that it is a power board, panel/Tcon or cable problem, I tested the components with the display controller from my other monitor and the setup is working like a charm....
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  • tofubazille
    replied to TWF LCD 2641ID parts needed
    in Troubleshooting TVs and Video Sources
    Re: TWF LCD 2641ID parts needed

    budm, thanks a lot!!

    I bought a new IC (FSD200) but I'm not sure if it will solve my problem (when I plug in the TV, the stand-by led is red for some seconds, then off).
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  • tofubazille
    replied to TWF LCD 2641ID parts needed
    in Troubleshooting TVs and Video Sources
    Re: TWF LCD 2641ID parts needed

    I really wonder why all repair kits use a BA159 instead of BYV36C (like shown in schematics). They are both rectifiers but I don't know if they are compatible. - The weird thing is that C202 and D201 are connected to each other, on my board they are limited to 600V and 400V, the replacements are both 1000V and the cap has a different capacity.
    So the question is: Did they use different components to improve the board layout or did they just use some components without thinking about it?
    A BA159 would be much easier to get.
    ...
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  • tofubazille
    replied to TWF LCD 2641ID parts needed
    in Troubleshooting TVs and Video Sources
    Re: TWF LCD 2641ID parts needed

    Yeah, this area is just a bit "smoky" on my board. I really wonder why my TV doesn't work anymore. I will try to replace C202, D201 and IC21. -
    I wouldn't buy these sets you mentioned, it's cheaper to buy in China (at least from Germany). I bought IC21 for 1,20€ on ebay (China) and the other stuff for some cents at a local store. Of course shipping will take about two or three weeks.
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    Last edited by tofubazille; 04-03-2013, 04:02 PM.

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  • tofubazille
    replied to TWF LCD 2641ID parts needed
    in Troubleshooting TVs and Video Sources
    Re: TWF LCD 2641ID parts needed

    Hi, here's the pic. ...
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  • tofubazille
    replied to TWF LCD 2641ID parts needed
    in Troubleshooting TVs and Video Sources
    Re: TWF LCD 2641ID parts needed

    Hi,
    D201 is a BYV36C diode.
    I'll go to bed now but will upload a pic of my board tomorrow.
    See more | Go to post

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  • tofubazille
    replied to TWF LCD 2641ID parts needed
    in Troubleshooting TVs and Video Sources
    Re: TWF LCD 2641ID parts needed

    Amazing, same day and nearly same problem here. When I plug in the TV the standby led is red for about 5 secs, then silence.

    My board is a 05TA132D / TEP110ID and you're right, my C202 is also 222M CS 560-2 565-1 Y400V and that's [B]2.2nF 400VAC[/B]. Here is the circuit plan for my board : h**p://arizanotlari.c*m/Semalar/Tv/lcd/telefunken/power/05ta132d-sema.pdf

    Your point no. 4 seems to be the jumper cable [B]J300[/B]. It's just a solid jumper, right between D201 and IC21.

    When did your board blow up? On power-on?...
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