the defective individual boards 300 c and 300 d previously all assembling parts are correspondingly engaged with the alignment parts the functional individual boards 310 a and 310 c can be firmly bonded to or fixed on the first panel 300 by glue to achieve the replacement of the defective individual boards 300 c and 300 d when the replacement is finished a new complete panel 320 with four functional individual boards 300 a 300 b 310 a and 310 c is obtained by the engagement between the alignment part and assembling part accurate and precise positioning is available which helps avoid inaccurate placement of components in subsequent process it should be noted that profiles of the aligned part and the assembling part are not limited to the embodiment above various kinds of shapes are within the scope of the present invention as long as profiles of two parts are capable of being fitted with each other generally a more complicated profile leads to a more accurate fit moreover the number of the assembling part and alignment part can be increased according to needs for a greater precision reference is now made to fig4 which is a flow chart of replacing and aligning individual boards in a panel in accordance with a preferred embodiment of the present invention another aspect of the present invention is a method for placing and aligning an individual board in a panel which is capable of replacing the individual board in the panel by accurate positioning in a preferred embodiment the method for replacing an individual board in a panel includes the following steps in step 402 a defective individual board is separated from a first panel in step 404 a functional individual board is separated from a second panel each of the individual.