Polaroid LCD tv DVD combo no power problem is it capacitors ?
The switch mode supplies in these TV's are an issue.
The high frequency transformers do give trouble as do the opto isolators.
I would be checking the electro's first with a capacitance meter, they can fail but not bulge the tops!!
Check ALL the solder joints that you can with a magnifying glass if you can get one.
If nothing shows up there, all you can do is go through each component one at a time and check it's value. The controller chip, transformer and opto are difficult to check so if all else fails, suspect them.
The transformer can be checked with a shorted turns tester if available. Also, remove the transformer from the board and carefully check each winding at the pins as they also have a tendency to break the winding at the pin due to thermal stress..
Nov 30, 2009 |
Cars & Trucks