Re: Laptop motherboard may be dead
The laptop i would like to repair is a Alienware M17x. I agree replace motherboard would be the quickest, but time is really not an issue. I also agree that an isolated dongle would make a lot of sense. WE have used the gear dongle hundreds of times without any problems. never thought of the possibly of the ac wires reversed.
thumper69
Member
Last Activity: 09-04-2023, 07:31 AM
Joined: 02-18-2018
Location: Wabasha,Mn
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Alienware M17x Laptop motherboard may be dead
We use a laptop to connect to an omron CPM2A serial port for programming and data transfer. Using a usb to serial adaptor and a blackbox connecting cable. The operator of the equipment had a failed ac power plug that powers the plc and changed it reversing the hot and neutral lines. the result was when connecting the plc to laptop it blew out adapter, plc, and laptop. apparently it sent 115 volt ac via ground into usb port of laptop. Laptop appears to try and power up but shuts down after a few seconds. Any repair possible or do i need new motherboard. -
Re: Sony KDF70XBR950
Which mirror.Leave a comment:
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Sony KDF70XBR950
Picture is not very bright. Has new oem Lamp. Anything else that might cause low brightness. -
Insignia NS-39D310NA15
Was wondering if anyone would know were to get service manual for this model. This model has only one main board which has both power & control for all other functions. Thanks in advance. -
Re: Panasonic TC-P50G20
Sent SC board in for repair. Results of repair: 14 bad components. Repair was Successful and the tv lives again. most Sc's would throw a 4 blink or 7-8. I think in my case 15 volt supply to sc shorted or so it seemed and vsus main voltage open so sos read 15 volt first. Just a guess. Thanks all for the help.Leave a comment:
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Re: Panasonic TC-P50G20
budwich- i thank you for your input. I spent almost 20 years in the TV repair business and these kind of problems always drove me crazy. You have to have this before you have that. Sometimes the creators of these high tech equipment forget someone somewhere will try to repair without enough documentation without the availability of tech support and sadly not enough parts at a reasonable price. We are left to do our best with parts from ebay or repair services with a wing and a prayer. I applaud those who find a way to keep things working. Never give up, always...Leave a comment:
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Re: Panasonic TC-P50G20
Sitting here thinking about what other possibilities than the Sc. Has there been occasions of the A board sos analysis faulty to the point of shutting down. If so one would think there must be a way to reset.Leave a comment:
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Re: Panasonic TC-P50G20
I don't have a trouble shooting guide with a page 79.Leave a comment:
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Re: Panasonic TC-P50G20
Well Testing was done at the 15 volt output at p11 i believe with sc 20 connected voltage at less than 1 volt than sos kicks in. Testing was also done at the 15 volt line just to make sure it read the same as 15 at p11. sc 20 was disconnected and 15 volt again measured and was normal until sos again shuts the set down i would think because no current coming from 15 volt on sc board. P board generates the 15 volt and than feeds A board which than supplies 15 volts to SC board through a flat cable. If the problem were on the A board i would think removing sc...Leave a comment:
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Re: Panasonic TC-P50G20
Budwich i think i will either look for a working board or boards or send in for repair. Either way the cost can add up fast. In this case trying to be as conclusive as possible before making a choice. The reason for asking meter question was in most cases probing almost always shows capacitor action which on my fluke meter may seem to show short but you can see the resistance rising quickly which to me indicates a non shorted circuit. I suspect the sc because sc2 shows quick capacitor action rising above a level thst would indicate a short while the sc 20...Leave a comment:
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Re: Panasonic TC-P50G20
Assuming the A board is confused is there a reset of the board as far as the sos is concerned.Leave a comment:
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Re: Panasonic TC-P50G20
Why a wild goose chase RJARRPCGP.Leave a comment:
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Re: Panasonic TC-P50G20
The history of the set is from the time it was new to sudden failure two weeks ago. Worked in the evening not in the morning. All voltages present except 15v when powered on. 15 volt present with sc 20 removed.Leave a comment:
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Re: Panasonic TC-P50G20
Someone must have some thoughts on this.Leave a comment:
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Panasonic TC-P50G20
Many threads on this tv but i do not see anything on my issue. Visual-10 blinks after turn on. Using panasonic repair manual i looked for short on 15 volt sc board and ss board. Resistance on both sc line and ss line seemed to be normal as in over 1k ohm reading. I read no rise in 15 volt line with meter connected when i turned on set. unplugged sc20 with meter connected turned set on observed 15 volts until shutdown circuit kicked in. my conclusion is bad sc board as per manual. AM I MISSING ANYTHING. Also what is the best setting to have your meter set to when doing the resistance checks. Any... -
Re: Sanyo DP42545
Update on DP42545. A friend of mine has the exact same tv only working, and i was able to sub some boards to determine where my issue was. Well it did turn out to be the power supply board. The bad part is i find no one that has this board available. The parts suggested to check could not be in a much worse place to get at. Do you think i can remove these parts with just a soldering iron. Afraid with all the sub components on the underside of board heat gun would be too much, any suggestions. Thanks in advance.Leave a comment:
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Re: Sanyo DP42545
Thank You for your help thus far. Will check the resistance and see where that leads.Leave a comment:
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Re: Sanyo DP42545
I had changed the power supply board and it seems unlikely the replacement board would have the same problem, but it does give the same symptoms. Perhaps a dummy load would prove that out if possible.Leave a comment:
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Re: Sanyo DP42545
What kind of load for testing purposes could i use.Leave a comment:
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