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It is not necessary to remove the white flat cable. After removing the three gold screws from the board, go to the next steps and in step 9 remove the cover while hold the board against the cover to prevent stress on the white cable.
I've had two of these calculators for many years. I finally went to replace the batteries and one of them seems to be sealed shut, it can't be opened without destroying the case. The second one opened ok. I was in Walmart and they have these in the school supplies section. A new TI-30Xa was only $9. The display is a bit larger as well. If you can't open it then this is a low cost alternative. BTW, In the one that I changed batteries, it work without any reset. but this may vary.
If there is no sound from your speaker, check the settings > speaker on/off. Also, if the headphone jack is being used the speaker will cut off.