M # F27442 CH # CTC 203 AB4. PWM power supply blown: Q14101, 14102, 14103 shorted, horizontal output Q14401 shorted, R14108, & 14109 burnt to peices, T14401 replaced, just to be sure. Now, standby voltages ok: + 139 vdc, comes right down to + 130 vdc, but within 30 seconds or so, goes as low as + 121 vdc, horizontal drive in stby is also + 139 vdc, & goes to + 83.6 vdc at turn on, but drops to + 79 vdc, at the same rate as the + 139 volts. Changed the PWM secondary diode that supplies the 139 vdc, still the same. Picture looks ok, but "swells" with video changes when changing channels, or on it's own after 30 secs or so. Ideas? Rono.
- posted
19 years ago