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?I've checked another manual for the VP chassis and for all sizes and CRT brands (including 25" Philips like yours) the value of C38 and C76 is always 680nF. Only some of the bigger tubes require a different value. Now I don't know what's on your chassis but I bet they're 680 and since these caps lose (not gain) capacitance when they degrade which makes the picture more compressed towards the side, I don't think they're out of specs (i.e. they kept the nominal value). Then again nothing forbids you to try different values as per my previous suggestion.
); i think i have to go too deep on my tech crt knowledge so for the moment i will try with the new crt board and if im not able to solve the issue i will try to follow your useful tips.
something must have been wrong with my old account. 
I wasted all day yesterday working on it.
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def combine_high_low(high_bytes, low_bytes):
"""Combines two byte arrays where the first array provides the high byte
and the second array provides the low byte for each 16-bit word."""
if len(high_bytes) != len(low_bytes):
raise ValueError("Both files must have the same length.")
combined = []
for hb, lb in zip(high_bytes, low_bytes):
# Combine into a 16-bit word
combined_word = (hb << 8) | lb
# Append high byte
combined.append(combined_word >> 8)
# Append low byte
combined.append(combined_word & 0xFF)
return bytes(combined)
def read_file(file_path):
"""Reads a file and returns its contents as a byte array."""
with open(file_path, 'rb') as file:
return file.read()
def write_file(file_path, data):
"""Writes binary data to a file."""
with open(file_path, 'wb') as file:
file.write(data)
def read_address(data, address):
"""Reads a 16-bit value from the combined data at a specified address."""
# Each address points to two bytes forming a 16-bit value
index = address * 2
return data[index] << 8 | data[index + 1]
def main():
# Paths to the input files
path_200e = 'F:/Desktop/MAME/nvram/harddrivcb/mainpcb_200e'
path_210e = 'F:/Desktop/MAME/nvram/harddrivcb/mainpcb_210e'
# Read the files
data_200e = read_file(path_200e)
data_210e = read_file(path_210e)
# Combine files: High byte from 200e, low byte from 210e
combined_high_200e_low_210e = combine_high_low(data_200e, data_210e)
# Combine files: High byte from 210e, low byte from 200e
combined_high_210e_low_200e = combine_high_low(data_210e, data_200e)
# Save the combined data to new files
write_file('F:/Desktop/MAME/nvram/harddrivcb/combined_high_200e_low_210e', combined_high_200e_low_210e)
write_file('F:/Desktop/MAME/nvram/harddrivcb/combined_high_210e_low_200e', combined_high_210e_low_200e)
# Read specific addresses
address_212 = read_address(combined_high_200e_low_210e, 0x212)
address_213 = read_address(combined_high_200e_low_210e, 0x213)
print(f"Address 0x212: {address_212} (0x{address_212:04X})")
print(f"Address 0x213: {address_213} (0x{address_213:04X})")
print("Files combined successfully and saved.")
if __name__ == '__main__':
main()
def read_combined_file(file_path):
"""Reads the combined file and returns its contents as a byte array."""
with open(file_path, 'rb') as file:
return file.read()
def split_combined_file(data):
"""Splits the combined data back into high and low byte arrays."""
high_bytes = []
low_bytes = []
for i in range(0, len(data), 2): # Process two bytes at a time
high_byte = data[i] # High byte (from the first file)
low_byte = data[i + 1] # Low byte (from the second file)
high_bytes.append(high_byte)
low_bytes.append(low_byte)
return bytes(high_bytes), bytes(low_bytes)
def write_file(file_path, data):
"""Writes binary data to a file."""
with open(file_path, 'wb') as file:
file.write(data)
def main():
# Path to the combined file
combined_path = 'F:/Desktop/MAME/nvram/harddrivcb/combined_high_200e_low_210e'
# Read the combined file
combined_data = read_combined_file(combined_path)
# Split the combined file back into original high and low files
high_data, low_data = split_combined_file(combined_data)
# Save the split data back to original file paths
write_file('F:/Desktop/MAME/nvram/harddrivcb/mainpcb_200e', high_data)
write_file('F:/Desktop/MAME/nvram/harddrivcb/mainpcb_210e', low_data)
print("Files have been successfully split and saved.")
if __name__ == '__main__':
main()
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