1. Home
  2. Electronics Repair
  3. Toshiba 27A10 Single Horizontal Line

Toshiba 27A10 Single Horizontal Line

8 year old TV. Nice picture. Began displaying a brighter line about 5 inches from the bottom occassionally but the picture was otherwise OK. I doubted my ability to track that down and let it go. Too subtle. Too intermittent. Tonight, entire picture collapsed into a single horizontal line. I opened up the case looking for the vertical output section and a bad cap or burnt component. Nothing seemed visually amiss. Plugged the set in and it works fine again. I now assume a bad solder joint. Can anyone suggest which components [by schematic number, if possibe] might need a prophylatic re-solder? Thank you. 
--
Remove -NOSPAM- to contact me.
Reply to
John Keiser
Loading thread data ...

You've pretty much diagnosed it. A bad solder joint in the vertical section, may even be the connector to the vertical deflection yoke winding. That should be easy to find, check it, then trace back to the vertical output.

-- sam | Sci.Electronics.Repair FAQ:

formatting link
Repair | Main Table of Contents:
formatting link

+Lasers | Sam's Laser FAQ:
formatting link
| Mirror Sites:
formatting link

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.

Reply to
Samuel M. Goldwasser

If the vertical output is one of those vertically mounted ICs on a heatsink, it's very likely one or more of its pins that need resoldering. They tend to break the solderings especially at the pins closest to the ends of the IC. Just resolder them all. Sometimes the cracks are so thin it's hard to see them, but if you pull the pins a bit with a fingernail, they often become clearly visible.

--
Ulrik Smed
Aarhus, Denmark
Reply to
Ulrik Smed

I appreciate the confirmations. I reflowed a few joints but really couldn't see any dull or brittle or cracked connections. The components seem sturdy and I was surprised to see Toshiba designed the board with 3 fuses. Seems well made for this day and age. I'll like to keep this going. If anyone is familiar with this model and can suggest which specific part number is the more likely culprit, I will rertain for future use should this fail again. Thank you.

--
Remove -NOSPAM- to contact me.
Reply to
John Keiser

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.