Repara tus cosas Comunidad Tienda

Modelo A1224 / mediados de 2007 y principios de 2008/2, 2,4, o 2,66 GHz Procesador Core 2 Duo

Preguntas 548 Ver todo

Opciones

No Video on LCD

Hello, I have a A1224/EMC 2133 Core2 Duo 20" iMac that will not produce video on the LCD. I bought this system with a known no video issue with the intent to fix it. I am a computer repair tech with over 15 years of experience, just looking for some second opinions on how to proceed. When I originally purchased the system it would not produce video at all on LCD or external monitor, but the chime could be heard. I replaced the video card with a used x2600 card from eBay. the original card was a 2400XT. Now it outputs external video but no video on LCD. Below are the troubleshooting steps I have performed so far.

-System will produce video to an external monitor and boot to a setup disk

-Resetting PRAM had no effect

-There is no video on LCD at all. Using a flashlight, there is no ghosted image to indicate there is simply a backlight failure

-The backlight does not appear to be turning on

- Diagnostics LEDs 1,2 and 3 light up right away and stay lit up. LED 4 never comes on.

- Voltages on the power harness going into the LCD inverter are Pin1:3.3v, Pin2:0v, Pin3:-.03v, Pin4:12v. I may have the pins listed in the reverse order.

Contestado! Ver respuesta Yo también tengo este problema

Es esta una buena pregunta?

Sí No
Puntuación 1
Agregar un comentario

2 Respuestas

Filtrar por:
Mas Útiles Más Reciente Más antiguo
Solución Elegida

Opciones

After replacing the LVDS cable the screen comes on with backlight.

Fue útil esta respuesta?

Sí No
Puntuación 0
Agregar un comentario
Respuesta Más Útil

Opciones

See if it's the inverter: iMac Intel 20" EMC 2133 and 2210 Inverter Replacement

Fue útil esta respuesta?

Sí No
Puntuación 1

4 comentarios:

Would a faulty inverter cause an image to not be displayed on the LCD? Since the inverter only powers the CCFLs I would expect to still get an image on the LCD that could be seen with a flashlight.

- de

Can you see a faint desktop. If so replace the inverter.

- de

No, I see no image in the LCD. I also tried with a flashlight up to the screen, and no image is on the LCD at all.

- de

Since I'm not getting any image on the LCD panel I decided to order an LVDS cable first. I figure my steps in order of importance are get an image on the LCD, then look into the backlight not lighting up.

- de

Agregar un comentario

Añadir tu respuesta

Joe estará eternamente agradecido.
Ver Estadísticas:

Ultimas 24 horas: 0

Ultimos 7 días: 0

Ultimos 30 días: 1

Todo El Tiempo: 365