nickelflippr
Member
I'm having a crack at fixing a Vizio (P42HDTV10A) 42" Plasma tv, which in turn uses an LG PDP42X32000 screen and associated driver boards. Found a couple of power supply caps that had slight bulges (Nichicon 330uf 450V) and replaced those. Also found a Taicon 1000uf 16V that was definitely bad on the tuner board, and replaced that.
With this model you can short a couple pins on the AUTO GEN plug to display an internal pattern, and I did so. Patterns were fuzzy/snowy for several minutes and slowly got better and better till a decent picture/pattern arrived. Pulled the test and hooked up a Direct tv box, and have the same thing, slow startup till decent picture. On occasion a loud burst of static over the speakers happens.
Took power board readings and all the 5, 9, 12, 24V rails look good. The Vsc, Vy, Va, and Vs look good too. In taking the Xsus voltages, my probe slipped and took out the 5V 10A smd fuse on the Ysus board. Fixed that, hope I didn't take anything else out?
So any thoughts on what direction to take this? Don't have a scope handy to test ripple or waveforms. Here's a pic of the startup condition.
With this model you can short a couple pins on the AUTO GEN plug to display an internal pattern, and I did so. Patterns were fuzzy/snowy for several minutes and slowly got better and better till a decent picture/pattern arrived. Pulled the test and hooked up a Direct tv box, and have the same thing, slow startup till decent picture. On occasion a loud burst of static over the speakers happens.
Took power board readings and all the 5, 9, 12, 24V rails look good. The Vsc, Vy, Va, and Vs look good too. In taking the Xsus voltages, my probe slipped and took out the 5V 10A smd fuse on the Ysus board. Fixed that, hope I didn't take anything else out?
So any thoughts on what direction to take this? Don't have a scope handy to test ripple or waveforms. Here's a pic of the startup condition.