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7-1. Dynamic Focus
Focus is poor
FVH
FVV
Is the waveform of the DF pin in FBT correct? Yes 1. Check the CRT socket or connector wire. 2. Trouble in FBT or CRT.
HITACHI : 450V 180V SAMSUNG : 370V 180V
FVH FVV
No Is the drain voltage of the Q605 about 650V?
Yes
1. Check the waveform of] the pin 13 of FBT. 2. Check D614, D613.
No Is the base voltage waveform of the Q244 correct? No 1. Check the 12V DC line. 2. Check Q607, Q602, Q603, Q605 and Q604. 3. Check the waveform of pin 13 in IC501. 4. Check the DZ610, DZ611.
