Why won't LCD from 12" G4 1G work in G4 1.33?

I have replaced the (cracked) screen in my iBook G4 12" 1.33 with one from a iBook G4 12" 1GHz. It won't work.

All the posts here indicate that it should be compatible. I have only swapped the LCD panel (as per the step-by-step guide), not any of the cables etc.

With the new screen, there is no video (on LCD or external monitor. After about 50 secs, the back light comes on and there is static (noise) from the speakers but that is all. The display data cable gets hot. If I disconnect the data cable from the LCD all works fine with an external monitor.

I have also tried an LCD from a 12" G3, with identical results (The G3 & 1GHz G4 LCDs appear identical, the 1.33GHz one is a different manufacturer: CHI-MEI). Essentially the same problem occurs if I put the 1.33 LCD into the G3.

Nothing seems to be fried as if I put them all back where they came from everything works.

I have rset the PRAM and the PMU

I deduce the displays are different, though iFixit offers only one replacement for all 12" iBooks. Could the Data cables be different? They are similar to look at. I have not opened up the Motherboard end yet. Has anyone experienced a similar problem?

Answered! View the answer I have this problem too

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Thanks for the comments. As you know, changing out the cables is a lot more difficult than swapping the LCD panel. I was hoping that I am wrong and someone may have come across something similar before, especially as everyone seems to say that all 12" LCDs are interchangeable.

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I swapped a lot of LCD panels in many iBooks G4 models and never really checked the panel brand. I even often used G3 panels in iBooks G4 without problem but it seems that the CHI-MEI can be picky sometimes that's why I recommend to use the LVDS cable that match the panel. Try it and let us know if it worked.

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Using the LVDS cable from the donor machine was successful, though the cable is too long as the 1.33 logic board socket is in different place. I left out the modem to get it fit comfortably (no great loss).

It seems that the ChiMei screen needs a non-standard cable that is not compatible with normal screens and vice-versa.

Thanks for your help.

It would be useful to others if it was noted against your Product code: IF150-052 that in some 1.33GHz 12" iBooks a replacement LVDS cable is also required.

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maybe you should try the other lcd cables to see if the problem is solved or if the cable still gets hot.

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Try the LVDS cable from the iBook G4 1ghz matched with its LCD panel. The LVDS cable could have a different form factor but the two connectors are identical and should connect to the 1.33 LVDS port. The inverter cable is different. The connector to the 1.33 logic board inverter socket is smaller.

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Indeed the cable system is the secret to a successful transplant of the LCD. As others have found out, merely swapping the LCD panel won't work. The cable must also be part of the transplant. Earlier today, I successfully swapped my defective ChiMei LCD panel and cable with a whole LG Phillips LCD assembly and cable taken from another 1.33 GHz iBook.

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