tesseract not able to read all digits accurately

I'm using Tesseract to recognize numbers from images of a screen taken with a phone camera. I've done some preprocessing of the image: processed image, and using Tesseract, I'm able to get some mixed results. Using the following code on the above images, I get the following output: "EOE". However, with this image, processed image, I get an exact match: "39:45.8"

import cv2
import pytesseract
from PIL import Image, ImageEnhance
from matplotlib import pyplot as plt

orig_name  = "time3.jpg";
image_name = "time3_.jpg";

img = cv2.imread(orig_name, 0)
img = cv2.medianBlur(img, 5)

img_th = cv2.adaptiveThreshold(img, 255,\
    cv2.ADAPTIVE_THRESH_MEAN_C,cv2.THRESH_BINARY, 11, 2)

cv2.imshow('image', img_th)
cv2.waitKey(0)
cv2.imwrite(image_name, img_th)

im = Image.open(image_name)

time = pytesseract.image_to_string(im, config = "-psm 7")
print(time)

Is there anything I can do to get more consistent results?