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| Vostro 1520 UMA (LA-4596P) No LVDS (crt working) https://vlab.su/viewtopic.php?f=41&t=136641 |
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| R EZ A [ 23 авг 2023, 20:21 ] | |
| Заголовок сообщения: | Vostro 1520 UMA (LA-4596P) No LVDS (crt working) |
hello my friends i have 4 new motherboards with same problem crt wotking fine but there is no LVDS matrix turns on but its just backlight and black screen i tried another cpu,ram,lcd and lcd cable tested flashing bios not help another motherboard work good in this setup +LCDVDD= 3.3V LCD_TST=3.3V LCD_CBL_DET#=0V LID_SW#=3.3V any idea? |
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| ricarry [ 25 авг 2023, 04:08 ] | |
| Заголовок сообщения: | Re: Vostro 1520 UMA (LA-4596P) No LVDS (crt working) |
Check the voltages of the lines: DISPOFF# INVT_PWM Anything, write me to DM |
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| R EZ A [ 28 авг 2023, 18:54 ] | |
| Заголовок сообщения: | Re: Vostro 1520 UMA (LA-4596P) No LVDS (crt working) |
ricarry писал(а): Check the voltages of the lines: DISPOFF# INVT_PWM thanks alot for your help DISPOFF#=3V INVT_PWM = 2.7V |
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| ricarry [ 28 авг 2023, 22:07 ] | |
| Заголовок сообщения: | Re: Vostro 1520 UMA (LA-4596P) No LVDS (crt working) |
R EZ A The voltages seem to be fine. I guess you're not testing the same display flex on all boards, right?... Could you attach photos of the display with the light in the room turned off? |
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| R EZ A [ 29 авг 2023, 20:19 ] | |
| Заголовок сообщения: | Re: Vostro 1520 UMA (LA-4596P) No LVDS (crt working) |
ricarry писал(а): The voltages seem to be fine. I guess you're not testing the same display flex on all boards, right?... Could you attach photos of the display with the light in the room turned off? i know what you mean but its not backlight problem i have 4 board with same problem but i also have working one too when i connect this matrix and lcd cable to working one, display works normally |
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| ricarry [ 29 авг 2023, 20:41 ] | |
| Заголовок сообщения: | Re: Vostro 1520 UMA (LA-4596P) No LVDS (crt working) |
R EZ A писал(а): i know what you mean but its not backlight problem i have 4 board with same problem but i also have working one too when i connect this matrix and lcd cable to working one, display works normally If you have a 100% functional board, you can take advantage and measure all the pins in diode mode, write them down and compare them with the other boards. Do the same with the voltages. You will surely find some difference |
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