Dominic, I did check input waveform as listed on Pin 2 4.4 volt with .3vpp 5ms input should be 4.4vpp (suspect low caused by IC451 not working) or maybe IC101 jungle bad?? have tried 2 different LA7836 and thoroughly washed area with acetone. Have painstakenly check continuity on all traces I am ordering jungle chip AN5163K reluctantly cause have never seen one bad Robert tvservice@xxxxxxxxxxxxx H & H Electronics Inc Dallas, TX ----- Original Message ----- From: <MDileo0000@xxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Thursday, October 23, 2003 1:28 PM Subject: [TechAssist] Re: Panasonic CT27G20T chassis AEDP246 series NA3D No Vertical > Robert, > > You made no mention, but are you receiving a vertical pulse to IC451? Using a > scope? I know it is very difficult to see because of the dark masking and > overlay, but look for broken pads and cracked traces at IC451. I wash the area > with acetone to clean away the flux residue to see things better. > > Dominic DiLeo > Atlantic TV > Freeport, Maine > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > n a message dated 10/23/03 1:49:10 PM Eastern Daylight Time, > tvservice@xxxxxxxxxxxxx writes: > > > OK Group > > Please tell me what I am NOT doing > > This set came from another shop with no vertical deflection > > Have relaced... > > IC451 LA7836 > > D451 NTE552 > > D557 5.1 volt zener > > D545 12 volt zener > > C451 220mfd > > C455 100mfd > > C457 .1mfd > > C453 2.2mfd > > C452 1mfd > > All resistors are within tolerance. IC451 voltages are... > > Pin 1 +12.3 volt VCC1 > > Pin 2 4.4 volt with .3v 5ms input should be 4.4v (suspect low caused by > > IC not working) or maybe IC101 jungle bad?? > > Pin 3 6 volt (size) > > Pin 4 gnd > > Pin 5 11 volt schem says 6 volt (ramp gen) > > Pin 6 .3 volt schem says 6.5 v (drive/feedback) > > Pin 7 +26 volt VCC2 > > Pin 8 0 schem says 2.6 v (pump up) > > Pin 9 n/c 2.7v > > Pin10 gnd > > Pin11 .5 volt schem says 15.4 v (output) > > Pin12 26 volt > > Pin13 5.1 volt > > Have also subbed yoke > > still no Vertical deflection > > > > Please any advice appreciated > > > > Robert > > tvservice@xxxxxxxxxxxxx > > H & H Electronics Inc > > Dallas, TX > > > **************************************************************************** * > Classifieds! Buy or Sell! > http://sell.tech-assist.org > The Tech Address Book: > http://www.tech-assist.org/secure/tip/contact.htm > Add a Repair Tip Here, or Change/Remove your Email Address: > http://www.tech-assist.org/secure/tip/main.htm > Lost Password: > http://www.tech-assist.org and select "Lost your Login Info?". > Email Archives: > //www.freelists.org/archives/techassist/ ***************************************************************************** Classifieds! Buy or Sell! http://sell.tech-assist.org The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.htm Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.htm Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: //www.freelists.org/archives/techassist/