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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Fallen TV - no picture, sound OK
Hi all, I've searched around this group a bit so I think I've and idea
where my problem may lie, but I thought I should ask anyway, just to make sure. The TV in question is a Beko 284222WNS. At a recent party in my house, it was knocked off its table and landed on its screen. The weight of it ripped the plug out of the wall socket (and broke off the "Earth" pin, which was actually just a piece of plastic moulded to the plug). Amazingly it didn't shatter, and from a brief look inside, nothing seems to be broken or dislodged (it's a wee bit too heavy to pick it up and shake it to see if anything rattles). When I powered it up, the picture was gone completely, but the sound seems to be OK. I can't feel any static from the screen on power-up so I guess I've got no high voltage. Does this mean a transformer is busted or could it be something else? Any advice would be very helpful, I'm just wondering really if it's worth my while taking it in to be repaired... Cheers, Anthony |
#2
Posted to sci.electronics.repair
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Fallen TV - no picture, sound OK
On Aug 5, 7:01*am, Tony Ramone wrote:
Hi all, I've searched around this group a bit so I think I've and idea where my problem may lie, but I thought I should ask anyway, just to make sure. The TV in question is a Beko 284222WNS. At a recent party in my house, it was knocked off its table and landed on its screen. The weight of it ripped the plug out of the wall socket (and broke off the "Earth" pin, which was actually just a piece of plastic moulded to the plug). Amazingly it didn't shatter, and from a brief look inside, nothing seems to be broken or dislodged (it's a wee bit too heavy to pick it up and shake it to see if anything rattles). When I powered it up, the picture was gone completely, but the sound seems to be OK. I can't feel any static from the screen on power-up so I guess I've got no high voltage. Does this mean a transformer is busted or could it be something else? Any advice would be very helpful, I'm just wondering really if it's worth my while taking it in to be repaired... Cheers, Anthony More likely the printed circuit board is cracked somewhere. A visual inspection might possibly lead to some thing,m but there are hundreds of traces, any one of which could be broken. Bob Hofmann |
#3
Posted to sci.electronics.repair
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Fallen TV - no picture, sound OK
"Tony Ramone" wrote in message ... Hi all, I've searched around this group a bit so I think I've and idea where my problem may lie, but I thought I should ask anyway, just to make sure. The TV in question is a Beko 284222WNS. At a recent party in my house, it was knocked off its table and landed on its screen. The weight of it ripped the plug out of the wall socket (and broke off the "Earth" pin, which was actually just a piece of plastic moulded to the plug). Amazingly it didn't shatter, and from a brief look inside, nothing seems to be broken or dislodged (it's a wee bit too heavy to pick it up and shake it to see if anything rattles). When I powered it up, the picture was gone completely, but the sound seems to be OK. I can't feel any static from the screen on power-up so I guess I've got no high voltage. Does this mean a transformer is busted or could it be something else? Any advice would be very helpful, I'm just wondering really if it's worth my while taking it in to be repaired... Cheers, Anthony When you dropped it you ****ed it up. Duh. |
#4
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Fallen TV - no picture, sound OK
On Aug 7, 11:41*am, "Stacey Chuffo" phsd-
wrote: "Tony Ramone" wrote in message ... Hi all, I've searched around this group a bit so I think I've and idea where my problem may lie, but I thought I should ask anyway, just to make sure. The TV in question is a Beko 284222WNS. At a recent party in my house, it was knocked off its table and landed on its screen. The weight of it ripped the plug out of the wall socket (and broke off the "Earth" pin, which was actually just a piece of plastic moulded to the plug). Amazingly it didn't shatter, and from a brief look inside, nothing seems to be broken or dislodged (it's a wee bit too heavy to pick it up and shake it to see if anything rattles). When I powered it up, the picture was gone completely, but the sound seems to be OK. I can't feel any static from the screen on power-up so I guess I've got no high voltage. Does this mean a transformer is busted or could it be something else? Any advice would be very helpful, I'm just wondering really if it's worth my while taking it in to be repaired... Cheers, Anthony When you dropped it you ****ed it up. Duh. Wow, really? Damn, I never considered that... |
#5
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Fallen TV - no picture, sound OK
Tony Ramone wrote:
On Aug 7, 11:41 am, "Stacey Chuffo" phsd- wrote: "Tony Ramone" wrote in message ... Hi all, I've searched around this group a bit so I think I've and idea where my problem may lie, but I thought I should ask anyway, just to make sure. The TV in question is a Beko 284222WNS. At a recent party in my house, it was knocked off its table and landed on its screen. The weight of it ripped the plug out of the wall socket (and broke off the "Earth" pin, which was actually just a piece of plastic moulded to the plug). Amazingly it didn't shatter, and from a brief look inside, nothing seems to be broken or dislodged (it's a wee bit too heavy to pick it up and shake it to see if anything rattles). When I powered it up, the picture was gone completely, but the sound seems to be OK. I can't feel any static from the screen on power-up so I guess I've got no high voltage. Does this mean a transformer is busted or could it be something else? Any advice would be very helpful, I'm just wondering really if it's worth my while taking it in to be repaired... Cheers, Anthony When you dropped it you ****ed it up. Duh. Wow, really? Damn, I never considered that... It's probably the circuit board that is broken around the high voltage transformer. This is quite heavy and is usually only carried by the board itself, so a chock can easily break the board. Look for cracks and broken tracks and repair the tracks, if you are lucky it hasn't blown anything else. -- Ulrik Smed Aarhus, Denmark |
#6
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Fallen TV - no picture, sound OK
Ulrik Smed wrote:
Tony Ramone wrote: On Aug 7, 11:41 am, "Stacey Chuffo" phsd- wrote: "Tony Ramone" wrote in message ... Hi all, I've searched around this group a bit so I think I've and idea where my problem may lie, but I thought I should ask anyway, just to make sure. The TV in question is a Beko 284222WNS. At a recent party in my house, it was knocked off its table and landed on its screen. The weight of it ripped the plug out of the wall socket (and broke off the "Earth" pin, which was actually just a piece of plastic moulded to the plug). Amazingly it didn't shatter, and from a brief look inside, nothing seems to be broken or dislodged (it's a wee bit too heavy to pick it up and shake it to see if anything rattles). When I powered it up, the picture was gone completely, but the sound seems to be OK. I can't feel any static from the screen on power-up so I guess I've got no high voltage. Does this mean a transformer is busted or could it be something else? Any advice would be very helpful, I'm just wondering really if it's worth my while taking it in to be repaired... Cheers, Anthony When you dropped it you ****ed it up. Duh. Wow, really? Damn, I never considered that... It's probably the circuit board that is broken around the high voltage transformer. This is quite heavy and is usually only carried by the board itself, so a chock can easily break the board. Look for cracks and broken tracks and repair the tracks, if you are lucky it hasn't blown anything else. If there is serious cracking, its best to glue the cracks up *before* soldering as the flux in the solder will stop glue from sticking. If any of the high voltage parts have actually broken loose, taking a chunk of flap of board with them, condemm it. When reparing tracks, the crack *must* be bridged with wire thin enough to fit on the track, not just solder. Dont do a point to point 'rats nest' other than purely for testing - Its a safety issue - Loose wires under the board will reduce design clearances to ventilation slots in the cabinet base etc. Be very sure you've found and fixed *all* the cracks before switching it back on. Ive seen a few spectacular burn-ups when just one small crack remained! |
#7
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Fallen TV - no picture, sound OK
"Tony Ramone" wrote in message ... Hi all, I've searched around this group a bit so I think I've and idea where my problem may lie, but I thought I should ask anyway, just to make sure. The TV in question is a Beko 284222WNS. At a recent party in my house, it was knocked off its table and landed on its screen. The weight of it ripped the plug out of the wall socket (and broke off the "Earth" pin, which was actually just a piece of plastic moulded to the plug). Amazingly it didn't shatter, and from a brief look inside, nothing seems to be broken or dislodged (it's a wee bit too heavy to pick it up and shake it to see if anything rattles). When I powered it up, the picture was gone completely, but the sound seems to be OK. I can't feel any static from the screen on power-up so I guess I've got no high voltage. Does this mean a transformer is busted or could it be something else? Any advice would be very helpful, I'm just wondering really if it's worth my while taking it in to be repaired... Cheers, Anthony Maybe you need to read the F.A.Q. for the newsgroup before you post: http://www.repairfaq.org/samnew/tvfaq/tvdropped.htm |
#8
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Fallen TV - no picture, sound OK
On Aug 8, 12:23 am, "Nicole Bischoff" wrote:
"Tony Ramone" wrote in message ... Hi all, I've searched around this group a bit so I think I've and idea where my problem may lie, but I thought I should ask anyway, just to make sure. The TV in question is a Beko 284222WNS. At a recent party in my house, it was knocked off its table and landed on its screen. The weight of it ripped the plug out of the wall socket (and broke off the "Earth" pin, which was actually just a piece of plastic moulded to the plug). Amazingly it didn't shatter, and from a brief look inside, nothing seems to be broken or dislodged (it's a wee bit too heavy to pick it up and shake it to see if anything rattles). When I powered it up, the picture was gone completely, but the sound seems to be OK. I can't feel any static from the screen on power-up so I guess I've got no high voltage. Does this mean a transformer is busted or could it be something else? Any advice would be very helpful, I'm just wondering really if it's worth my while taking it in to be repaired... Cheers, Anthony Maybe you need to read the F.A.Q. for the newsgroup before you post: http://www.repairfaq.org/samnew/tvfaq/tvdropped.htm Thanks, I hadn't seen that, sorry. And thanks for all the tips everyone else. |
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