Aboutcleggsan Expertise Consumer Electronics of all kinds. Audio, esoteric audio systems and components, video, tv. Digital equipment for consumer use. Ham radio and automotive electronics.
Experience Electrical Engineering; recording, broadcasting, design, international standards, tv and radio theory and practice.
Organizations FELLOW of AES (Audio Engineering Society)
Senior Life Member of IEEE (Institute of Electronic and Electrical Engineers)
International Consulting Organization
Publications IEEE Spectrum
Various Consumer Electronic publications
Education/Credentials BSEE
MSCS
MBA
Awards and Honors Famous Engineer for Digital Audio
Question We have had this 1080i tv for about 4 years. Just recently the picture started to give a red outline so I attempted to reset the red convergence. It would not chang. So then I attempted to change the blue and green convergence. They both adjusted per normal. Do you think this is just the red convergence chip? I do have a lost of soldering experience and have even replaced chips in other devices before. Do you think I could do the replacement if it is just a chip? Also, where do I get the best deal on said chip I believe it is a stk392-110 but I could be wrong on the part number. Thank you for any help you can pass on.
Answer Yes, the convergence circuit has gone bad.
It requires 2 IC to be replaced. They are mostly the STK392-110 as you stated but I am going to check the number for you before finishing this reply to you.
They are an 18 pin device and must be de-soldered very carefully with a lightweight iron (15 or 20W size) and you must be careful not to burn surrounding components or strip or injure the conducting foils around the STKs. Sometimes you will find a burnt resistor near one of the ICs that must be replaced also.
You can google for these STKs and find them for $6.00 and up. Stay away from the real cheap ones as they don't last so long. The good ones are $20 and up/each.
Ok, this source has the complete kit for Hitachi RPTVs:
You can look at the convergence ICs as you pull them out and their would be the reference number on them. I am quite certain your chassis takes the STK392-110; 99% sure. The kit above contains, also, replacement resistors that may be burnt. If you replace the ICs without replacing a burnt resistor they new ICs may go up in smoke in a matter of seconds.
If you decide to have a shop come out and do the repair the usual cost is $300 to $400!
