This tv is getting a bit long in the tooth and I have repaired a dry solder joint once before.
Syptoms: Initially the picture had white lines across the top 3 inches, sort of looked 'interlaced' with the picture. Now the unit starts with a black screen with some very dim light areas at the top then switches to 'standby' mode.
There is the sound of the tv program during the 5 seconds before standby.
Any help would be greatly appreciated.
An expert who has achieved level 2 by getting 100 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert whose answer got voted for 100 times.
Re: Sony CRT Tv (KV-T29SZ8)
When you see white lines at the top of the screen, it means that the pump-up capacitor next to the vertical output IC is bad and the IC is about to quit. When the output finally quits, you get a black screen with possible dim spots. The vertical output IC and its pump-up cap will have to be replaced, and the little fuse resistors next to the flyback in the + and - supplies to the vertical output IC must be checked too. If you have experience working on TV's then you can do it yourself, but if not then have the set serviced by a tech experienced in Sony sets.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
HI, By three blink it means the B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is because there is problem in the power supply circuit. Check for any dry soldering in the power supply side. If the tv is working properly for 20 minutes then its sure that there is some dry soldering joints in the power supply side. You have to resolder suspected soldering contacts using soldering ion and solder. The dry soldering joints will look like on in the picture.
It is possible that there is a fault on the CRT or in the drive circuit in the CRT section.
There is every possibility that the fault can be a dry soldering joint in the CRT section of the TV. So remove panel and make a good soldering on the CRT board, the main board and the connectors.
This must solve the fault provided that the CRT is not faulty.
If the display seems normal when present, you may have what is called a 'cold solder joint,' possibly in the area of the horizontal power supply.
This can be caused by normal heating and cooling of a particular spot on the circuit board that finally fractures the solder and making the joint thermally sensitive.
Most component failures, even when intermittant, would affect the display in some obvious way such as distortion, contrast, brightness, etc.
KV-32HS510 and KV-27HS420, seven times blink error code shows problem in Horizontal deflection circuit.
There are many possibilities like dry solder joints, weak capacitors, Horizontal transistor short or flyback transformer fried etc.
If you have little experience of TV repair and good solder skills and have necessary tools to test / check defective parts, then you can make it. you also need to have related service manual to see board location, schematics and part numbers.
The problem is dry joints on the vertical output ic for sure(commen fault with sony),ime in the uk and 99% of the time i get a call about sony tv its allways switches itself off, caused by dry joints.