XO Troubleshooting Display/lang-es: Difference between revisions
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This is the portion of the [[XO Troubleshooting Guide|XO Troubleshooting Guide]] for diagnosing problems with the display of an [[Hardware|XO laptop]]. |
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Esto es la parte de la [[XO_Troubleshooting_Guide/lang-es|Guia diagnóstico del laptop XO]] para diagnosticar problemas con la pantalla de un [[Hsrdware_specification#Laptop_Hardware|laptop XO]]. |
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{{anchor|The display doesn't turn on}} |
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==La pantalla no se enciende== |
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{{Translated text| |
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Use a strong light shining on the display to confirm that the problem isn't that [[#The_backlight_doesn.27t_turn_on|the backlight won't turn on]]. If you see text or graphics on the display, the problem is with the backlight. |
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Use a known good display to check whether the display or the motherboard is broken. |
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If the known good display also does not turn on, the motherboard is broken and should be replaced. |
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| display=none }} |
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Use una luz fuerte que brilla en la pantalla para confirmar que el problema no es que la [[#The_backlight_doesn.27t_turn_on|luz del fondo no se enciende]]. Si ve texto o gráficos en la pantalla, el problema es con la luz de fondo. |
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Utilice un pantalla conocido como buena para comprobar si la pantalla o la placa madre está roto. |
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En caso de la pantalla conocido como buena también no se enciende, la placa madre está roto y debe ser cambiada. |
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{{anchor|One half of the display looks bad}} |
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==La mitad de la pantalla se ve mal== |
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{{Translated text| |
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Many of these end up being problems with the main display cable (the thick one). The rest are due to display failure. |
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Muchos de estos son problemas con la cable principal de la pantalla (el grueso). El resto se deben a falla de la pantalla. |
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{{anchor|Is the display cable properly connected ? |
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===¿Está conectada correctamente el cable de la pantalla?=== |
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[[Disassembly_top|Disassemble the laptop]] to access the larger flex cable from the display to the motherboard. Make sure that it is properly seated in its connector and properly clamped down. The white stripe on the cable should be close to and parallel to the black tab clamping the cable down. |
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''Photo needed here, a closeup of the display connector'' |
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If the connector is broken (the small black tab fails to stay in place), the motherboard will need replacement. |
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{{anchor|Is the display broken ?}} |
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===¿Está roto la pantalla? === |
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Use a known good display to check whether the display or the motherboard is broken. |
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If the known good display shows the same problem, the motherboard is broken and |
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should be replaced. Typically, this problem is due to a display failure. |
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==The display fades to white== |
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This problem is almost always due to a display failure. Follow the same debugging procedure as with [[XO_Troubleshooting_Display#One_half_of_the_display_looks_bad|one half of the display looks bad]]. |
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==The backlight doesn't turn on== |
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If the backlight isn't on in [[Open Firmware]], or when turned up using the ''display brightness'' keys in Sugar, check the following: |
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===Is the backlight cable connected ?=== |
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[[Disassembly_top|Disassemble the laptop]] to access the small flex cable from the display to the motherboard. Make sure that it is properly seated in its connector, and properly clamped down. |
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If the connector is broken (the small black tab fails to stay in place), the motherboard will need replacement (see [[XO_Temporary_Backlight_Cable_Repair|temporary repair]]). |
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===Is the lightbar broken ?=== |
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If the cable is well seated, then it is possible that the actual lightbar in the display has failed. Test the laptop with a known good display. If its backlight works, then the original display has a [[Disassembly_backlight|lightbar that needs replacing]]. |
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===Is the backlight power supply broken ?=== |
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If the backlight of a known good display doesn't work, the motherboard needs replacement. |
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:Suspect components are the backlight power supply: U9, D9 (1A schottky), L9 (4.7 uH), R147 (11 ohms), R144 (10K) and Q13 (2N3904 equivalent). |
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==The backlight comes on, but could go out at any time== |
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If the backlight doesn't stay on, there are two possibilities: |
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* Power management software is dimming the backlight to save power. |
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* You have a hardware problem. This case is the same as [[XO_Troubleshooting_Display#The_backlight_doesn.27t_turn_on|the backlight doesn't turn on]] |
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==The backlight isn't even== |
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In this case, a vertical pattern of light and dark is seen on the display. The difference between light and dark regions being strongest at the bottom of the screen. |
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===Is the backlight cable properly connected ?=== |
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[[Disassembly_top|Disassemble the laptop]] to access the small flex cable from the display to the motherboard. Make sure that it is properly seated in its connector, and properly clamped down. If the connector is broken (the small black tab fails to stay in place), the motherboard will need replacement (see [[XO_Temporary_Backlight_Cable_Repair|temporary repair]]) |
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===Is the lightbar partially broken ?=== |
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If the cable is well seated, then it is likely that the actual lightbar in the display has failed. Test the laptop with a known good display. If it shows an even backlight, then the original display has a [[Disassembly_backlight|lightbar that needs replacing]]. |
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===Is the motherboard backlight driver broken ?=== |
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If a known good display shows the problem, the motherboard needs replacement. |
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:Check the voltages across R147, R148, and R149 when the backlight is operating. They should be equal. If they are not, replace the corresponding switch transistor (Q13, Q14, or Q15, respectively) with a generic NPN low power switching transistor (2N3904 equivalent). |
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[[Category: Repair]] |
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[[Category: Hardware]] |
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[[Category: Developers]] |
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Revision as of 16:34, 13 July 2008
| Traducción de XO_Troubleshooting_Display | original |
| english | español +/- | cambios |
Esto es la parte de la Guia diagnóstico del laptop XO para diagnosticar problemas con la pantalla de un laptop XO.
La pantalla no se enciende
Use una luz fuerte que brilla en la pantalla para confirmar que el problema no es que la luz del fondo no se enciende. Si ve texto o gráficos en la pantalla, el problema es con la luz de fondo.
Utilice un pantalla conocido como buena para comprobar si la pantalla o la placa madre está roto.
En caso de la pantalla conocido como buena también no se enciende, la placa madre está roto y debe ser cambiada.
La mitad de la pantalla se ve mal
Muchos de estos son problemas con la cable principal de la pantalla (el grueso). El resto se deben a falla de la pantalla.
{{anchor|Is the display cable properly connected ?
¿Está conectada correctamente el cable de la pantalla?
Disassemble the laptop to access the larger flex cable from the display to the motherboard. Make sure that it is properly seated in its connector and properly clamped down. The white stripe on the cable should be close to and parallel to the black tab clamping the cable down.
Photo needed here, a closeup of the display connector
If the connector is broken (the small black tab fails to stay in place), the motherboard will need replacement.
¿Está roto la pantalla?
Use a known good display to check whether the display or the motherboard is broken.
If the known good display shows the same problem, the motherboard is broken and should be replaced. Typically, this problem is due to a display failure.
The display fades to white
This problem is almost always due to a display failure. Follow the same debugging procedure as with one half of the display looks bad.
The backlight doesn't turn on
If the backlight isn't on in Open Firmware, or when turned up using the display brightness keys in Sugar, check the following:
Is the backlight cable connected ?
Disassemble the laptop to access the small flex cable from the display to the motherboard. Make sure that it is properly seated in its connector, and properly clamped down. If the connector is broken (the small black tab fails to stay in place), the motherboard will need replacement (see temporary repair).
Is the lightbar broken ?
If the cable is well seated, then it is possible that the actual lightbar in the display has failed. Test the laptop with a known good display. If its backlight works, then the original display has a lightbar that needs replacing.
Is the backlight power supply broken ?
If the backlight of a known good display doesn't work, the motherboard needs replacement.
- Suspect components are the backlight power supply: U9, D9 (1A schottky), L9 (4.7 uH), R147 (11 ohms), R144 (10K) and Q13 (2N3904 equivalent).
The backlight comes on, but could go out at any time
If the backlight doesn't stay on, there are two possibilities:
- Power management software is dimming the backlight to save power.
- You have a hardware problem. This case is the same as the backlight doesn't turn on
The backlight isn't even
In this case, a vertical pattern of light and dark is seen on the display. The difference between light and dark regions being strongest at the bottom of the screen.
Is the backlight cable properly connected ?
Disassemble the laptop to access the small flex cable from the display to the motherboard. Make sure that it is properly seated in its connector, and properly clamped down. If the connector is broken (the small black tab fails to stay in place), the motherboard will need replacement (see temporary repair)
Is the lightbar partially broken ?
If the cable is well seated, then it is likely that the actual lightbar in the display has failed. Test the laptop with a known good display. If it shows an even backlight, then the original display has a lightbar that needs replacing.
Is the motherboard backlight driver broken ?
If a known good display shows the problem, the motherboard needs replacement.
- Check the voltages across R147, R148, and R149 when the backlight is operating. They should be equal. If they are not, replace the corresponding switch transistor (Q13, Q14, or Q15, respectively) with a generic NPN low power switching transistor (2N3904 equivalent).