Question about Polaroid 4011-TLXB LCD TV
....all the capacitors appear fine. The power light cycles from blue-to-red, and no picture or sound. The board number is 860-AZ0-JK371H. I can not find a legible schematic. I checked the caps with an ohmmeter (in circuit), and they all respond as expected. None are obviously blown as typical with this situation. The regulator, number STR-A6252M has some dark marking around it (as though it had been overheated). Does this part fail often? I can only get readings off three of the seven pins, as access is blocked by a heat sync. Can I bench test that part? What else can I look at with my multimeter to figure out what the problem is? No budget for this job. It must be in house, and next to free. I would appreciate any gratis info, or documents to help me solve my problem. Thanks.
Hi the blue and red cycling is a bad mainboard firmware fault thanks
Posted on Mar 19, 2017
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Posted on Jan 02, 2017
Check that everything is pluged in and only use 105 degree c caps 85 degree ones will not last long. New caps can be bad with todays parts i see lots of new ones that are bad. I would replace ALL caps on a power supply board the heat kills them so they may need replacing every year or more if the set is on a good part of the day. The power supply is on to some extent all the time a set is plugged in. Watch the + and - on the caps put it in wrong and you may blow out other parts and for sure the new cap.
Posted on Nov 02, 2009
Disconnect the jack lead that goes to the inverter board and see if you have 24v from the P/S. If you don't then you should replace the power supply. If you have 24v, then the inverter board is bad.
Posted on Nov 30, 2009
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