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| Acer Aspire 7560G (Compal (LA-6991P)) jumping contrast. https://vlab.su/viewtopic.php?f=59&t=16062 |
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| abhilashvaman [ 06 окт 2013, 09:34 ] | |
| Заголовок сообщения: | Acer Aspire 7560G (Compal (LA-6991P)) jumping contrast. |
Brought this unit - split matrix. Completely broken down (by ship from one deck to the second moved quickly). Platform: Compal (LA-6991P). Matrix stood there: B173RW01 But when replacing the matrix transpired very intriguing defect - jumping the contrast on the display. Went through several matrices - and they either do not show the image, or display, but with a jumping contrast. The main speaker jumping chaotic. Change vref on the matrix resistor slightly improves the display, but the twitching will not disappear - the distortion of colors. Now is the matrix: N173FGE. Firmware matrix does not lead to anything - if drained what was in the previous one - out there. And it all comes down to the same effect - either jerks or not out. BIOS firmware on the different versions is no it does not affect the iso. turned some fluctuation in the power matrix pines - but the overall makeup external power does not change the situation. On signal lines can not see no crime - at least as seen from the oscillograms. Flex is not interrupted - and the impact it has no effect on the picture. Remained all three assumptions: 1. The new matrix is not friends with the frequency of Sloka (maybe that introduces a handful of existing blemishes.) 2. May break out a pair of synchronization - and oscilloscope shows the interpenetration of the signal within the processor array. 3. For this laptop is needed B173RW01 - just look for it. Otherwise - the brain melted |
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| RsM [ 06 окт 2013, 11:26 ] | |
| Заголовок сообщения: | Re: Acer Aspire 7560G (Compal (LA-6991P)) jumping contrast. |
It is a Full HD matrix. It uses 2 LVDS channels. Check their resistance on MB (16 wires, relatively gnd) without matrix. |
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