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ener_dk
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Last Activity: 08-07-2023, 09:57 AM
Joined: 11-22-2019
Location: DK3230
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  • ener_dk
    replied to Lenovo M800
    in Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals
    Re: Lenovo M800

    I have checked the diode and it measures OK.
    If I ohm the RTC power line to ground its about 6,5K ohm without the diode on the board. I have have also lifted all the resistors and caps around the battery no change in resistance.
    PCH? Did you mean PCB?

    I tried to locate the RTC ic but no luck - there are some IC that I cant find datasheets on so I guess that one of them is the RTC IC.

    But any way the PC works now and it online so every time Windows starts the clock it syncronized.

    Thanks a lot for your guidance ...
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  • ener_dk
    replied to Lenovo M800
    in Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals
    Re: Lenovo M800

    I found the problem
    Its the 3,3 RTC power line that is draining the CMOS battery to fast.
    I have checked the dual diode and the passive components around the the battery nothing seems defective.
    So a quick fix is that I took a wire from the 3.3 v PSU too the RTC power line to see if that "fixed" the problem and it did.
    So thereis something on the RTC power line is half dead?!
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  • ener_dk
    replied to Thomson 32HB3103 sound problem
    in Troubleshooting TVs and Video Sources
    Re: Thomson 32HB3103 sound problem

    I lifted C138 close to TPA3110d2 and the problem was resolved.
    C138 is connected to /SD on the chip.

    BR
    Ener_DK
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  • ener_dk
    replied to Lenovo M800
    in Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals
    Re: Lenovo M800

    Thanks for your reply piernov.

    No I don't want to kill it - could be nice if I could repair it.

    32 ohm on a 5v line is 715mW or 311 mW on a 3.3v line.. so in my world that normally pretty low resistance.
    But this is my first mainboard repair so I still have a lot to learn.

    I cant google a diagram for it or even another thinkcentre model.
    So do you know if the onboard power supply is more or less the same as on a Lenovo laptop?
    It would be nice to have an idea on how it works instead of looking in the dark....
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  • ener_dk
    started a topic Lenovo M800
    in Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals

    Lenovo M800

    Hi All,

    I have an M800 (10FX) where is completely dead.
    The PSU is new and the power switch pulls 3.3 v dc low.

    I checked the mainboard for obvious problems as burned component and leaking caps.

    What I found was a liquid spill around the chipset.
    I cleaned it and tried again without any luck.

    Then I check the caps around the chipset and the resistance is about 35 ohm.
    So I lifted a lot of the caps and the power FET with same resistance to check for faulty components.
    No caps and FET seems to be faulty but the...
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  • ener_dk
    replied to Toshiba plasma 50WP16 wierd double image fault
    in Troubleshooting TVs and Video Sources
    Re: Toshiba plasma 50WP16 wierd double image fault

    Hi piershs,

    I can not find any reference to IC9011 in the service manual other than the selfcheck.
    None of the IC's in the selfcheck is in the component list so I don't know what the test if good for?

    If you replace the D-Board you need to do these adjustments according to the service manual:
    White balance, Pedestal and Sub brightness for NTSC, PAL, HD, PC and 625I signals.

    So taking that into consideration it would maybe be a good idea to replace the D-board??
    This is my...
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  • ener_dk
    replied to Thomson 32HB3103 sound problem
    in Troubleshooting TVs and Video Sources
    Re: Thomson 32HB3103 sound problem



    Little update: I gave the TPA3110d2 a little blow with the heat gun at 100 Celsius and could reproduce/speed up the problem.
    So Im going to replace the TPA3110d2

    BR
    Ener_dk...
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  • ener_dk
    replied to Thomson 32HB3103 sound problem
    in Troubleshooting TVs and Video Sources
    Re: Thomson 32HB3103 sound problem

    Did anyone resolve this problem?
    I have the same problem on a TCL f32b3804 with the almost same PCB.. they have just added a LAN connector.

    I have checked that the amplifiers for the speakers and headphones are not the same.
    The amplifier for the headphones are the 14 pin IC just above the headphone plug.

    I'm thinking of replacing the TPA3110d2

    BR
    Ener_dk
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