I have a Sylvania 32" LCD that stopped working after a thunder storm.
I have some electronics experience and removed the back cover to find that the main fuse was blown (4A/125V). I replaced the fuse, only to have it blow again within seconds. I'm assuming that there is a shorted component(s) downstream of the fuse. Does anyone out there have experience with this board, that may be able to give me a good starting point for testing. I only have a digital multimeter and a simple cap tester that requires caps to be removed for testing.
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Re: ba71f0f01042 power board blows fuse
I'm not too familar with this model, but to give you some pointers, you will find when you have this problem the fuse will go straight away as there will be some of the semi-conductors short circuited. Check your bridge rectifier diodes & also the chopper transistor in the power supply. As a general check, test most of the diodes & power transistors & replace any that read short circuit on your meter. Hope this may help you as a guide line.
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TV won't turn on means the power supply section is dead. Open the back cover if you can. Check up for the blown fuse. If the fuse is blown, replace a new one of the same rating. If the TV works, enjoy viewing and if the fuse blows again consult some TV tech. Never try another fuse with higher rating. It might seriously damage your TV. Good luck.
on the power board you will see a black flat ac converter with this on it + ~ ~ - on it check this with a meter its more than likely to have gone as its the first thing to go in a storm. the + and - can be the other way round ~ ~ is the mains volts in and + - is the volts out if the ~ ~ has no resistance it has blown and it will keep blowing the fuse check the + - and you should have a resistance from the rest of the power board.
Hello If the TV doesn't turn ON ata all, it is surely due to some fault with its power supply regulator section. You haven't given any otehr details of your tV, than it is only a 32 inch CRT Sylvanial Tv. No model number; so I only can provide you a solution in general. Check the ON-OFF switch for its contact. Normally, TVs uses DPST type switches [Double Pole Single Throw]. If any one contact amoung them have any problem with its internal contacts, the set won't switch ON. If the switch is OK, come towards the power regulator section circuit board, and check whether the fuse has blown out or not. If it has blown out, replace it with same type and ampere rating. Never use higher ampere rating than specified. The ampere rating will be maiked either on the rims of the fuse, or at the printed circuit board, just under the fuse. After repalcing the fuse, switch ON the TV and see whether it works well or the replaced fuse blows up as soon as you switch ON the set. If the repalced switch burns out as soon as you switch ON the set, the power supply section has damaged [shorted components in it]; and should be replaced. Normally for LCD TVs it will be good to replace the power supply as card basis. This power regulator card can be bought from most of the electronic spare part shops at your town, orby the authorised service center for Sylvania at your town. If you may have given its model number, I could send you the picture of the power card of your TV. OK.
Hello, this can be fix but know that Ur power supply board is dead, u know basic electronics’ and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get ur tv power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement. Hope this helps...
The most common problem is the Power/Backlight Inverter Board. There are 6 mini transformers on the board, one goes bad and the TV will turn itself OFF automatically for " Protection Mode". Replace the whole board or replace the bad mini transformer.
Whole board, BA71F0F01042
Mini Transformer, LTZ2PC0MS008
Since the main fuse is being effected, it suggests that there is a major problem in the power supply section. I would be looking for a shorted rectifier diode. If you have any experience with electronics, you may be able to locate this problem. If hte set is still in warranty, return it for warranty service. If not, try loking for burned components etc.