Sanyo 25" TV struck by lightning - where do I begin?
I am new to repairing TVs. I am an arcade repair man and so I'm not
totally new to electronics. Difference is, I don't know where to get
parts/schematics for TVs. If it were a wells-gardner k7400 25" monitor
sure, no problem, but as for TVs, I just don't know. I really hate to
junk this and have to buy another one. I'd like to get into TV repair.
Can anyone tell me where to start?
rca d52w19 52in rear projection television
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Re: Sanyo 25" TV struck by lightning - where do I begin?
The typical power input involves a small line filter, fuse, inrush current limiting resistor (1.2 - 2.8 ohms) rectifier bridge, filter capacitor(s) and a 120 volt regulator. All located quite close to where the power cord connects. If there is one diode shorted in the bridge, replace all four if they are discrete. The fuse and the resistor may both be open, depending on the level of damage. Make sure the input and output of the regulator are not shorted together. Even if you get the set to come to life, the tuner may be toast, as the antenna connection and power line serve to be the entrance and exit paths for the damaging energy. Respect the high-voltage section in the TV just as you do with the monitors.
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Replace or have the powrer supply tested and eventually serviced. Lightning strikes affect two types of boards in televisions - the power supply by means of entering through the AC line and main boards by means of entering from the external signal sources. External antennas are worst and can totally toast the main board whereas a signal entering through HDMI cable from another device is less likely to be affected by a power surge. So naturally you start your quest with the power board , which is the usual suspect.
As of right now I do not believe we have an announced service for the power supply board of Sanyo LCD-24K50, but if you do not have any other options you can always try and send the power board for examination/repair through http://www.coppelltvrepair.com/newservice.
Any time a unit is hit by lightning, it is usually a total loss. While the initial problem may be fixable, other components have been stressed and are likely to fail. Most shops won't work on these units because of the likelyhood of continual failures. Warranties won't be given or the repairs. In your specific case, the switching IC has been damaged and needs to be replaced as well as the surround processing section. This is best handled as an insurance claim for replacement.
Warranty voider there.
Hate to see a $1,000 TV go down the toilet.
If your lucky, you can try checking the fuses inside the TV.
The lightning may have taking out only your power supply board, shopjimmy.com may have replacements for about $100. But, I can't tell you for sure that will fix the problem.
You may have to take to a repair shop to find out for sure.
Not to different from arcade, If the fuse is blowing right away check the bridge rectifiers next for shorts and anything on the primary ac to dc side first, Caps,may have a surge suppressor on the ac side. If it was lightning sure you will find it in this area. Secondary supply shorts usualy do not blow fuses, Just cause the supply to shutdown.
If it was struck by lightning, the surge would completely fry the insides of your TV. Your TV probably won't work anymore and you may have to consider replacing it. Some TVs have accident warranties so something like this could be protected, but if not, you will have to purchase a new one.
Sorry to here about your problem! This is the time of year I used to get tons and tons of sets, stereos ,games, and vcrs in for repair. On your panasonic it seems that maybe the surge took out the tuner portion or the power supply. It sould cost aprox. 200 bucks or so for a new tuner. Im sure your aware that homeowners will cover almost all repair after the deductable. Good Luck