Riddled TV Repair Forum

GeeAlex · Joined: 02 Mar 2014 Posts: 5 Location: Sacramento, CA

I've had this TV since 2002 and am hoping to save it. Here is what's happening:

What happens is when I press the power button it turns red, you can hear it firing up, and then just before the picture should come on it cuts off. When I press power again, nothing happens. If I unplug it, and then plug it in again, the same cycle of events will reoccur: red light on, powering up, shut off.

After some initial online investigation I did a step by step to replace the fuse: I followed all the steps that led me to the fuse, removing the entire back of the TV to make it easier.

However the fuse appears to be fine.

Any suggestions?

Thanks,

Greg

Google

JTS1957 · Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away

What electronics troubleshooting experience do you have?
What test equipment do you have or can get? Do you know how to use them?
Can you read service literature and are able to follow a schematic? Know about symbols, reference numbers, etc.
Do you know what the various components are and can you test them?
Can you remove soldered in parts (for testing or replacement) & install (replacements/reinstall originals) after testing them?
I'm sure I'm forgetting something ... Oh, the most important thing ... CAN YOU FOLLOW INSTRUCTIONS?

GeeAlex · Joined: 02 Mar 2014 Posts: 5 Location: Sacramento, CA

Thanks for the reply. Unfortunately 'None' and 'No' would be the answers to most of the other questions posted above. Anticipating what the next piece of advice might be, I'm calling a local TV repairman and have him out to have a go. I'm encouraged to think it might still be salvageable.

I'll let you know how it goes.

Greg

JTS1957 · Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away

Just giving 'fair warning' as to what may be required. Wink

GeeAlex · Joined: 02 Mar 2014 Posts: 5 Location: Sacramento, CA

I appreciate it. I was hoping it was simply the fuse, but it was clearly fine. I'm assuming you think it might be repairable? I'm trying to put off buying a new TV for as long as possible. Or at the very least, exhausting all options before jettisoning what has been an extremely reliable TV.

Greg

Google

JTS1957 · Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away

IF it HAD been the fuse in your pix, the set would have been TOTALLY Dead.
As long as the part(s) that has failed is STILL available, it should be fixable.
If picture was fine before this failure, it should be fine after repairs are made.

Does set have any sound from speakers? Be sure to try ALL inputs. If set failed while A/V input was being used, it should still be on that input.
Do you hear/feel the static of high voltage (back of hand 1/4" from FACE of CRT)?

Many of the things I asked earlier (how to use DMV, removing/testing/reinstalling/soldering parts) are demonstrated on You Tube,
just be aware some might steer the amateur to things they don't want or need.

GeeAlex · Joined: 02 Mar 2014 Posts: 5 Location: Sacramento, CA

I was thinking the same thing about the fuse, that I probably shouldn't be getting any response at all, but hope springs eternal. I could definitely 'hear' the static of high voltage as it was firing up. I was using most of the inputs for gaming consoles, roku, and stereo speakers. I wasn't using the speakers on the TV; I was using external stereo speakers. Once I had everything unplugged I tried plugging the set it and turning it on, but had the same outcome. Now that it's open and face down, I reluctant to try it again until someone has a look at it with the proper tools for testing. I DID very carefully vacuum a lot of dust from the inside of the set, which is understandable after almost 12 years of service. Looking at parts listed by Sears, it does seem it's possible that a lot replacements can be ordered.

I'm in over my head if I go to YouTube for instructions. I was comfortable with everything up to finding the fuse. Beyond that, it's unknown.

JTS1957 · Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away

A couple of other suggestions:

Get a marker and mark a thin line onto the shaft of the SCREEN knob of the flyback transformer in your set. Be sure it extends onto the plastic. I want you to be able to return the control back to very close to where you began.
I want you to turn this knob clockwise approximately 30 degrees (5 minutes on a clock face). Plug in (set should be able to stand up - no back - no other connections) turn on and observe face of CRT and see if you get a horizontal line across the center of the screen.
These sets were famous for the vertical IC developing bad solder joints.

GeeAlex · Joined: 02 Mar 2014 Posts: 5 Location: Sacramento, CA

I just saw the new post. I followed your instructions, turned the knob of the flyback transformer clockwise apprx 5 degrees, turned the set upright, plugged it in and turned in on. I got the same result as before. I tried repeating the process in complete darkness using the remote and observed a rectangular block of light in the lower right hand corner of the screen just before it shut itself down. I could really hear the static electricity popping with the cover removed.

Greg