Sharp 13SB50 tv
in [Repair]
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From: Wayne Tiffany on 9 Jan 2006 13:27 I have finally picked this one up again. Short version - no response to a remote control and the TV itself doesn't have controls to change channel, volume, etc. It does power up, but is stuck on channel 2, so nothing but snow on the screen. I have traced a 200+Hz signal from the IR receptor to pin 19 of an IC when using the remote. The chip is: Sharp X1674CE 761 91365A013 But I can't seem to find a datasheet on this chip to try to figure out its output. Does anyone have any info that might help me? Or am I missing something obvious? The fact that the owner said both remotes that she gave me used to work just fine on the TV, and then they both quit operating it leads me to think that the problem is not with the remotes. WT
From: b on 11 Jan 2006 17:38 Wayne Tiffany ha escrito: > I have finally picked this one up again. > > Short version - no response to a remote control and the TV itself doesn't > have controls to change channel, volume, etc. It does power up, but is > stuck on channel 2, so nothing but snow on the screen. > > I have traced a 200+Hz signal from the IR receptor to pin 19 of an IC when > using the remote. The chip is: > > Sharp > X1674CE 761 > 91365A013 > > But I can't seem to find a datasheet on this chip to try to figure out its > output. Does anyone have any info that might help me? Or am I missing > something obvious? The fact that the owner said both remotes that she gave > me used to work just fine on the TV, and then they both quit operating it > leads me to think that the problem is not with the remotes. > > WT before jumping in there let's start with the simple. Get a crappy portable Am radio or use a clock radio-alarm for example. detune it. put fresh batteries in the remotes and see if you get some bleeps when you press the remote next to the radio. that ought to help eliminate the remotes - if you hear sound they're probably emitting ok ( the frequency may have drifted, tho' i only saw this happen once in 10 years!). report findings please. -B.
From: Wayne Tiffany on 11 Jan 2006 18:21 I will try it - thanks. But I also figured that if, as stated, I am seeing the 200+Hz pulse output going from the IR receptor to the chip, that should be evidence enough that the remote is outputting, and also that the receptor is seeing it and responding. Is this not correct? WT "b" <reverend_rogers(a)yahoo.com> wrote in message news:1137019138.391679.221450(a)z14g2000cwz.googlegroups.com... > > Wayne Tiffany ha escrito: > >> I have finally picked this one up again. >> >> Short version - no response to a remote control and the TV itself doesn't >> have controls to change channel, volume, etc. It does power up, but is >> stuck on channel 2, so nothing but snow on the screen. >> >> I have traced a 200+Hz signal from the IR receptor to pin 19 of an IC >> when >> using the remote. The chip is: >> >> Sharp >> X1674CE 761 >> 91365A013 >> >> But I can't seem to find a datasheet on this chip to try to figure out >> its >> output. Does anyone have any info that might help me? Or am I missing >> something obvious? The fact that the owner said both remotes that she >> gave >> me used to work just fine on the TV, and then they both quit operating it >> leads me to think that the problem is not with the remotes. >> >> WT > > before jumping in there let's start with the simple. > Get a crappy portable Am radio or use a clock radio-alarm for example. > detune it. put fresh batteries in the remotes and see if you get some > bleeps when you press the remote next to the radio. that ought to help > eliminate the remotes - if you hear sound they're probably emitting ok > ( the frequency may have drifted, tho' i only saw this happen once in > 10 years!). report findings please. > -B. >
From: Wayne Tiffany on 12 Jan 2006 10:38 Ok, tried the radio check and both remotes have beating hearts. Next thoughts? Anyone run across a datasheet for that chip? WT "Wayne Tiffany" <wayne.tiffanyRMVJUNK(a)asi.com> wrote in message news:43c59181$0$32504$6d36acad(a)roc.nntpserver.com... >I will try it - thanks. But I also figured that if, as stated, I am seeing > the 200+Hz pulse output going from the IR receptor to the chip, that > should > be evidence enough that the remote is outputting, and also that the > receptor > is seeing it and responding. Is this not correct? > > WT > > "b" <reverend_rogers(a)yahoo.com> wrote in message > news:1137019138.391679.221450(a)z14g2000cwz.googlegroups.com... >> >> Wayne Tiffany ha escrito: >> >>> I have finally picked this one up again. >>> >>> Short version - no response to a remote control and the TV itself >>> doesn't >>> have controls to change channel, volume, etc. It does power up, but is >>> stuck on channel 2, so nothing but snow on the screen. >>> >>> I have traced a 200+Hz signal from the IR receptor to pin 19 of an IC >>> when >>> using the remote. The chip is: >>> >>> Sharp >>> X1674CE 761 >>> 91365A013 >>> >>> But I can't seem to find a datasheet on this chip to try to figure out >>> its >>> output. Does anyone have any info that might help me? Or am I missing >>> something obvious? The fact that the owner said both remotes that she >>> gave >>> me used to work just fine on the TV, and then they both quit operating >>> it >>> leads me to think that the problem is not with the remotes. >>> >>> WT >> >> before jumping in there let's start with the simple. >> Get a crappy portable Am radio or use a clock radio-alarm for example. >> detune it. put fresh batteries in the remotes and see if you get some >> bleeps when you press the remote next to the radio. that ought to help >> eliminate the remotes - if you hear sound they're probably emitting ok >> ( the frequency may have drifted, tho' i only saw this happen once in >> 10 years!). report findings please. >> -B. >> > > >
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