Shorted HOT's in newer TV's

[Findm-Keepm]

One old trick we always used was a 100W litebulb in series with the collector supply to the HOT. Sometimes you can isolate the flyback pin and connect the lightbulb there, other times, break the trace running to the collector and tie it in there. Bulb bright? Too much current running through the HOT, meaning something else is wrong, usually shorted diodes in the scan-derived supplies (flyback secondary(ies), a shorted cap, a high-ESR cap or two in the scan supplies, or something downriver fed by the scan derived supplies (Vert output, audio output, tuner, etc.) If the bulb is dim, low current being drawn by the sweep circuit, so let it run for a few minutes, power down, and check the HOT and flyback temps. Warm? probably ok to restore the collector supply. HOT? look at the tuning side of the fly - the driver xistor (leakage) /driver transformer (shorted turns, intermittent, etc). ALWAYS check for cracks in the area of the flyback - large mass mounted to a flimsy board=crack potential and cracked runs are not uncommon.

With the lightbulb in circuit, the scan voltages will be lower, so don't be alarmed with a shrunken pic, bad pincushion, or other subtleties.

Hope this helps,