I found these values on several Sharp Image schematics.
Maybe worth checking against the ones you have.
H-Posi = 10k
H-Hold = 10k
V-Posi = 1k
V-Size = 100k
V-Hold = 5k
Bright = 2k
Contrast = 10k
Use your ohm meter to mesure the ones that aren't broken.
Measure the ohms between points A and B. The two legs side by side.
This should give you the total value of the pot.
Check between A and C or B and C while turning it to see if it varies like it is supposed to.
A ------
>
<------ C
>
B------
Hope this helps.......

(still not exactly sure which model you have though)