Electronic equipment repair and service manual search discussion :: Topic review

Frank · Posted: Mon Mar 12, 2007 7:29 pm Post subject:

Hi guys, again with this set Sorry. could it be the Saw Filter SF12301 the cause of uhf weak signal, i should have 0v at the tuner pin 11=IF, instead of the 250milivolts? What you guys think thanks in advance.

Frank · Posted: Sun Mar 11, 2007 1:52 am Post subject:

Minnie thanks for your response i ESR all the electrolictics and are all ok.

minnie · Posted: Sat Mar 10, 2007 12:47 am Post subject:

Check C14502.

Frank · Posted: Fri Mar 09, 2007 7:39 pm Post subject:

This is a stand up tuner i already resolder near the RF connetor that had crackes,but no avail, when i get in the service menu there are error codes 1,has 23,2,23,3 24,do you know what it means for this chassis?i heard that one need a chipper checker to adjust tuner setings,agc,and so on ,is this needed in case i change tuner? i replaced also the gemestar with one i had from same modle,but the set didn't start with it, could this fault be related to Gemstar? i also notice that tuner pin 11should be 0v is 250miliamps what you think. Thanks for you help.

minnie · Posted: Thu Mar 08, 2007 5:06 am Post subject:

Frank · Posted: Thu Mar 08, 2007 1:12 am Post subject:

Help please Minie.

Frank · Posted: Wed Mar 07, 2007 7:08 pm Post subject:

Hi i went a head and changed the Vert ic,and is not the ic,.Then i started to check around and found out that it has to do with AGC or the tuner. because channel 3 VHF is good.the problem is channel 21 UHF.i have my 33vsup,i think there's a leak some where because when i take out the RF connector and cut off a litle bit of the midle positive coax cable wire. so it inserts in but not touch inside positive side of the tuner, the picture gets great, but the vhf chan 3 gets grainy,.I already used one tuner that i had exra,but the pic was ok but a bit grainy,then i went back to the previous tuner, that's why i think it has to do with AGC & tuner, but don't know where to start maybe the U12101.what's your advice on this.thanks in advanse.

Frank · Posted: Wed Mar 07, 2007 7:04 pm Post subject:

Hi ,i went a head and changed the Vert ic. it's not the ic,.Then i started to check around and found out that it has to do with AGC or the tuner. because channel 3 VHF is good.the problem is channel 21 UHF.i have my 33vsup,i think there's a leak some where because when i take out the RF connector and cut off a litle bit of the midle positive coax cable wire. so it inserts in but not touch inside positive side of the tuner, the picture gets great, but the vhf chan 3 gets grainy,.I already used one tuner that i had exra,but the

CORY · Posted: Mon Mar 05, 2007 11:43 pm Post subject:

try resoldering vertical ic first and surrounding area.

Frank · Posted: Mon Mar 05, 2007 11:23 pm Post subject:

Thanks,I replaced Q14103 fixed the short. tv is up and running,the only thing now have a litle bit rolled up vertcal with good pic and color what you thing? the vertical ic maybe bad? before i change it i'd like to know your opinions .