Quote:
Originally Posted by luRaichu
New HOT, cleaned CRT pins & reflowed pads on CRT socket, and the TV is still doing the same shit (no lightbulb!). The picture starts normal but then gets too bright & loses H sync. At this stage +B is 131 to 132v. The colors get VERY saturated, and soon Green disappears followed by Red and Blue. Then all you've got is a bunch of monochrome garbage lines dancing across the screen. Sometimes, a bright colorful flash appears indicating something just disconnected. +B jumps to something like 139v in this state, and what once was a fluctuating whining noise becomes a monotonous high pitch. Orange filament glow disappears I think.
Next to the flyback, there is a pot labeled "SUB BRIGHT". Should I bother?
Edit: Just did another test run. The picture lasted for a few seconds but then the magical flash appeared and +B dropped to 127v! |
The #F002 will open if HOT shortens out, probably. If +B are not collapsing to zero V when image disappears*** (in fact it will rise due to R802), confirm measuring if HOT really shorted out. Perhaps only the oscillator can stopped due to some overload (try to run with brightness and contrast to minimum, normally this will suffice and not needs to adjust the sub bright).
Perhaps the screen grid (G2) are cranked up. Is interesting to reduce it to see that happens.
***if is the oscillator protecting something or faulty oscillator.