Panasonic 27XF25CW 27" TV Horizontal Line until warms up
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From: bluespark on 13 Mar 2010 20:29 Hi, I'm a new user to this group. I have the above TV - GAOO, circa 2006,with the following symptoms. When the TV is turned on and cold, there is bright horizontal line in the middle of the screen with a flickering picture in the top half of screen and bottom 1/2 is black. As the tv warms up, the image does eventually fill in and the whole screen is more or less viewable. The mid-section does continue to have some flickering lines, however, is still reasonably viewable. Can anyone direct me to whether this is a low voltage or HV issue? Is this reasonably repairable or is it IC's etc all surface mount. Appreciate any help.
From: PlainBill47 on 14 Mar 2010 15:07 On Sat, 13 Mar 2010 17:29:09 -0800 (PST), bluespark <barry.hathaway(a)gmail.com> wrote: >Hi, I'm a new user to this group. I have the above TV - GAOO, circa >2006,with the following symptoms. >When the TV is turned on and cold, there is bright horizontal line in >the middle of the screen with a flickering picture in the top half of >screen and bottom 1/2 is black. As the tv warms up, the image does >eventually fill in and the whole screen is more or less viewable. The >mid-section does continue to have some flickering lines, however, is >still reasonably viewable. >Can anyone direct me to whether this is a low voltage or HV issue? >Is this reasonably repairable or is it IC's etc all surface mount. >Appreciate any help. The symptoms would indicate a bad solder joint in the vertical deflection circuit (probably on the vertical deflection IC) or a bad capacitor in the vertical deflection area. This is definitely repairable by a competent technician, but do you know enough about TVs to locate the suspect components and to work safely? PlainBill
From: Franc Zabkar on 14 Mar 2010 17:16 On Sat, 13 Mar 2010 17:29:09 -0800 (PST), bluespark <barry.hathaway(a)gmail.com> put finger to keyboard and composed: >Hi, I'm a new user to this group. I have the above TV - GAOO, circa >2006,with the following symptoms. >When the TV is turned on and cold, there is bright horizontal line in >the middle of the screen with a flickering picture in the top half of >screen and bottom 1/2 is black. As the tv warms up, the image does >eventually fill in and the whole screen is more or less viewable. The >mid-section does continue to have some flickering lines, however, is >still reasonably viewable. >Can anyone direct me to whether this is a low voltage or HV issue? >Is this reasonably repairable or is it IC's etc all surface mount. >Appreciate any help. The symptoms suggest a bad electrolytic capacitor near the vertical amp IC. This is a low voltage issue. I'm not familiar with your model, but the vertical IC will probably be attached to a heatsink, and will probably have a part number beginning with AN, and be in a 9-pin (?) SIP package. Follow the 4-wire lead back from the deflection coils on the picture tube. Two of the wires will go to the horizontal section (high voltage), and the other two will go to the vertical amp (~25V). - Franc Zabkar -- Please remove one 'i' from my address when replying by email.
From: Samuel M. Goldwasser on 14 Mar 2010 19:19 Franc Zabkar <fzabkar(a)iinternode.on.net> writes: > On Sat, 13 Mar 2010 17:29:09 -0800 (PST), bluespark > <barry.hathaway(a)gmail.com> put finger to keyboard and composed: > > >Hi, I'm a new user to this group. I have the above TV - GAOO, circa > >2006,with the following symptoms. > >When the TV is turned on and cold, there is bright horizontal line in > >the middle of the screen with a flickering picture in the top half of > >screen and bottom 1/2 is black. As the tv warms up, the image does > >eventually fill in and the whole screen is more or less viewable. The > >mid-section does continue to have some flickering lines, however, is > >still reasonably viewable. > >Can anyone direct me to whether this is a low voltage or HV issue? > >Is this reasonably repairable or is it IC's etc all surface mount. > >Appreciate any help. > > The symptoms suggest a bad electrolytic capacitor near the vertical > amp IC. This is a low voltage issue. I'm not familiar with your model, > but the vertical IC will probably be attached to a heatsink, and will > probably have a part number beginning with AN, and be in a 9-pin (?) > SIP package. > > Follow the 4-wire lead back from the deflection coils on the picture > tube. Two of the wires will go to the horizontal section (high > voltage), and the other two will go to the vertical amp (~25V). It is a low voltage issue, but there are HIGH VOLTAGES in the vicinity. The OP needs to either have had experience in this type of electronics (which it sounds like he does not) or at the very least, know enough to know what not to touch! Read, understand, and follow the SAFETY GUIDELINES in the TV Repair FAQ. If in any doubt, get it repaired by a professional. This is not a major repair. -- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. > > - Franc Zabkar > -- > Please remove one 'i' from my address when replying by email.
From: bluespark on 2 Apr 2010 08:23
On Mar 14, 7:19 pm, s...(a)repairfaq.org (Samuel M. Goldwasser) wrote: > Franc Zabkar <fzab...(a)iinternode.on.net> writes: > > On Sat, 13 Mar 2010 17:29:09 -0800 (PST), bluespark > > <barry.hatha...(a)gmail.com> put finger to keyboard and composed: > > > >Hi, I'm a new user to this group. I have the above TV - GAOO, circa > > >2006,with the following symptoms. > > >When the TV is turned on and cold, there is bright horizontal line in > > >the middle of the screen with a flickering picture in the top half of > > >screen and bottom 1/2 is black. As the tv warms up, the image does > > >eventually fill in and the whole screen is more or less viewable. The > > >mid-section does continue to have some flickering lines, however, is > > >still reasonably viewable. > > >Can anyone direct me to whether this is a low voltage or HV issue? > > >Is this reasonably repairable or is it IC's etc all surface mount. > > >Appreciate any help. > > > The symptoms suggest a bad electrolytic capacitor near the vertical > > amp IC. This is a low voltage issue. I'm not familiar with your model, > > but the vertical IC will probably be attached to a heatsink, and will > > probably have a part number beginning with AN, and be in a 9-pin (?) > > SIP package. > > > Follow the 4-wire lead back from the deflection coils on the picture > > tube. Two of the wires will go to the horizontal section (high > > voltage), and the other two will go to the vertical amp (~25V). > > It is a low voltage issue, but there are HIGH VOLTAGES in the vicinity. > > The OP needs to either have had experience in this type of electronics (which > it sounds like he does not) or at the very least, know enough to know what > not to touch! Read, understand, and follow the SAFETY GUIDELINES in the > TV Repair FAQ. > > If in any doubt, get it repaired by a professional. This is not a major > repair. > > -- > sam | Sci.Electronics.Repair FAQ:http://www.repairfaq.org/ > Repair | Main Table of Contents:http://www.repairfaq.org/REPAIR/ > +Lasers | Sam's Laser FAQ:http://www.repairfaq.org/sam/lasersam.htm > | Mirror Sites:http://www.repairfaq.org/REPAIR/F_mirror.html > > Important: Anything sent to the email address in the message header above is > ignored unless my full name AND either lasers or electronics is included in the > subject line. Or, you can contact me via the Feedback Form in the FAQs.. > > > > > - Franc Zabkar > > -- > > Please remove one 'i' from my address when replying by email. Are there schematics avaiable online anywhere, free or purchase? Thanks for helo ALL |