The following is meant for informational purposes only and not meant to be an instructional guide. This information is meant to give a basic concepts on how the thermal fuse is replaced, It doesn’t cover everything thing and can vary on other TVs. If you decide to replace your own thermal fuse based on this information you do so at your OWN RISK.
For information on the Sony Wega flat CRTs with a similar problem (in this case a model KV34HS420), visit Lee Devlin website and view his posting titled “Fixing a Sony Wega with a 6 or 7 blink code“.
A few weeks ago I was watching my Sony 60 inch rear projection TV (model KDF-E60A20) when the screen turned blank and the normally green power-on indicator started blinking red. I thought, this has to be a bad thing. My first assumption was the bulb died.
The bulb did not die, there is a whole other indicator light for a dead bulb. What was actually happening is the power-on indicator light was blinking 6 times. Some googling on this subject indicated that the thermal fuse had blown and it needed to be replaced.
Sony apparently has a service bulletin (E29102171) that covers the replacement. In order to access this information you have to be some sort of authorized service personnel. I did find a website where you could obtain the service bulletin but they wanted $12 to join the site first. Let me go on for a moment and say why I think this is a total scam. It seems the damaged thermal fuse situation is a design flaw and Sony’s replacement part is totally different from the original. This website is profiting off the situation by providing information was created by Sony. I won’t link to the site here, but if you search google for this issue you will surely find the site in question.
This is something that Sony should be fixing for free. I’m reading people are paying around $400 to get this issue repaired. I repaired mine for $17.91. The part itself was only $4.80. I ordered part 191002393 from Sony’s service site (It’s available from Amazon.com for $5.95). Here’s how I replaced mine.
First, the thermal fuse is simply a small electronics part on the end of two wires that connects to the harness in the TV. The wire comes wrapped up in a small package about the size of two dimes. Shipping costs $11.95 to ship it in a giant box full of bubble wrap. Thanks Sony for wasting resources getting this to me.
The thermal fuse is located under the lamp housing in my TV (and can be seen using the procedures for replacing the lamp in the manual). It’s a dime sized device mounted to the bottom of the TV with two wires coming out of it. It took me a while to figure out that this monstrosity is the thermal fuse considering how tiny the replacement is.
Unfortunately In order to get to the wiring harness I had to remove the rear panel of the TV. There’s about 10 screws that hold that on. Then I removed the fan housing to gain access to the original thermal fuse. I followed the wires back up to where they connected to the wiring harness. I unplugged the original fuse and plugged in the new one and ran the wires to where the original fuse is.
I did not remove the original fuse. It’s somewhat difficult to get to and doesn’t hurt to keep it on. I wrapped the new fuse wiring around the old one. There may be a actual place to mount the new fuse but i didn not see the service bulliten so I cannot say for sure. It’s important to point out here that the purpose of a thermal fuse is to shut off power in case of an over heat situation. If for some reason the lamp overheats you don’t want it to catch the TV on fire. Having the thermal fuse in close proximity to the lamp seem logical. If you happen to know exactly where the fuse should go, please leave a comment.
The preceding is meant for informational purposes only and not meant to be an instructional guide. This information is meant to give a basic concepts on how the thermal fuse is replaced, It doesn’t cover everything thing and can vary on other TVs. If you decide to replace your own thermal fuse based on this information you do so at your OWN RISK.