Sharp LC-60LE832U Burnt 5v Standyby... lightning

[JDRiv]

Hey everyone, I was hoping someone with a big brain could lend me a minute. I have a dps-183bp-4 a board (runtka798wjn1) that took a lightning strike. well.. the transformer on the pole did, blew it up, blew up my outdoor heat pump.. and my tv. So I am looking to change out my exploded ic7905 chip and the related resisters etc. The problem is, is that i can not find a repair kit for my model of board, does anyone know if the Sharp RDENCA336WJQZ (DPS-286AP) Power Supply Component Repair Kit will work?

https://www.shopjimmy.com/sharp-rden...repair-kit.htm

Making the assumption that my problem lies within ic7905 because it is burnt and the plastic is broken off...so a small explosion took place at a fast rate lol. TV has no power, does not respond to remote or buttons. I have verified that the fuse (f7001) is closed with no voltage change across it, so figured I should just start with the obvious and troubleshoot from there if it does not solve the problem.

I have visited all of the local tv repair shops in my area to see if they sell parts and the only thing they will do is charge me to search for a new power board, then charge me for the board plus mark up, but can not or will not sell board parts to solder in.. anyway, any help is appreciated.

[canadaboy25]

Re: Sharp LC-60LE832U Burnt 5v Standyby... lightning

I'm assuming you don't know the actual numbers on the chip?

[JDRiv]

Re: Sharp LC-60LE832U Burnt 5v Standyby... lightning

Your assumptions are correct, I can't make out what the numbers are due to the shard of plastic that's missing from the chip.

[canadaboy25]

Re: Sharp LC-60LE832U Burnt 5v Standyby... lightning

Ah I see. Well if it were me I'd think that the kit would work because power supplies usually don't change drastically between models. But if your resistor and diode are both fine, 15 bucks for a chip is a lot. I'll have a look around and see if I can't find the chip number.

[fzabkar]

Re: Sharp LC-60LE832U Burnt 5v Standyby... lightning

Have you checked the service manual?

http://elektrotanya.com/?q=showresul...at2=schematics

FWIW, this service manual appears to have some references to IC7905:



EDIT:

The Sharp Aquos LC32D43U has a TNY268PN standby power IC at location IC7905. Looks plausible ...

[JDRiv]

Re: Sharp LC-60LE832U Burnt 5v Standyby... lightning

I have searched through the manual, perhaps I keep missing it? Have yet to find what the ic part code is.. actually I can't find any information on the board itself.

[canadaboy25]

Re: Sharp LC-60LE832U Burnt 5v Standyby... lightning

That chip is $3 from China -->http://www.ebay.ca/itm/5pcs-TNY268PN...kAAOSwDk5T7hWb It is so cheap you wouldn't be out anything if it didn't work.. except the month you'd have to wait for China shipping.

EDIT: Found one for cheaper -->http://www.ebay.ca/itm/1pcs-TNY268PN...4AAMXQO21RqVrl but you only get one instead of five.

EDIT2: It was on page 124 of the second link fzabkar posted.

[JDRiv]

Re: Sharp LC-60LE832U Burnt 5v Standyby... lightning

I have ordered a couple tny268 chips (just in case i wreck one soldering it in). Thanks for the input and in a month when I get the chip in ill update lol. may need to look into diodes and resistors but crossing fingers this is the only thing the power surge popped

[budm]

Re: Sharp LC-60LE832U Burnt 5v Standyby... lightning

Is the Fusible R7914 OK? When that IC blew up, it may have taken out the fusible resistor also, you may want to look for other similar resistors to see if they are OK too.

[culcuhain]

Re: Sharp LC-60LE832U Burnt 5v Standyby... lightning

Mouser has the chips too. $1.71 each. $8 shipping and have it in a few days. Waiting on stuff from China will try your patience. I am waiting on some mosfets. I need one. Can't find them in the US. Got 20 for $6.01... ordered almost a month ago....

[dick_barton]

Re: Sharp LC-60LE832U Burnt 5v Standyby... lightning

Try Coppell who have a repair kit that may have the components you are looking for or perhaps you could ask them.

Kit:
Replacement components for IC7905, R7914, R7918 and D7908.

http://www.coppelltvrepair.com/p/119...tandby-voltage

[JDRiv]

Re: Sharp LC-60LE832U Burnt 5v Standyby... lightning

Thanks everyone for the sources, I have ordered the fusible resistors that feed the chip as well. Because its so cost effective, I figured it would be smart to get it coming anyway.. just in case. Some parts are coming from the US... some from china, so hopefully the wait isn't too long. Thanks again for everyone's input, made the search a lot easier for parts. Go into an electronics store, they basically say flush off. Come here, you guys do all but the work; appreciate it for sure.

[dick_barton]

Re: Sharp LC-60LE832U Burnt 5v Standyby... lightning

Hope it solves your problem. Come back and let us know.