Analysis + b overcurrent protection. Just turned on (screen not lit) when current is 400mA (normal); screen after normal Imaging. Show highlight frame scenes, +B currents of up to 1. 2A。 General picture and confirm current O. 8A。 (Sony 29 inch color TV, its normal line current is 700mA. Maximum current should not exceed 900mA. Or overcurrent protection will occur. )
Highlight the screen and confirm current shows abnormal brightness limiter circuit on this computer. It can be concluded that the fault is caused by ABL circuit failure.
Close examination revealed IC001 (TDAl 2067) 46 foot plate line cracked, after welding troubleshooting.