Hello all
A friend brought me this TV to see if I could fix it.
TV has the classic sound but no picture issue that I am pretty sure is caused by a few bad ccfl bulbs which seems to be a common issue for this model of TV.
I just wanted to get some opinions from a few more experienced people.
Symptoms: After pressing the power button the green power light comes on and about 3sec later the backlights light up (with a buzzing noise) then go right back out.
I have read that disconnecting the K8L connector should cause the backlights to stay on for a longer period of time, but when I tried it the only change was that I got the backlight flash immediately after pressing the power button instead of the 3sec delay that happens when K8L is connected.
Tests done so far: checked fuses on both inverter boards, checked voltages and they were ok.
A few times the TV would stay on (with a buzzing noise) and what looks like 3 darker lines going across the TV (bad ccfls I'm assuming)
What is causing the TV to work sometimes and not most of the other times?
can I "hot wire" the TV to run with a few bad bulbs or would that be dangerous?
thanks
A friend brought me this TV to see if I could fix it.
TV has the classic sound but no picture issue that I am pretty sure is caused by a few bad ccfl bulbs which seems to be a common issue for this model of TV.
I just wanted to get some opinions from a few more experienced people.
Symptoms: After pressing the power button the green power light comes on and about 3sec later the backlights light up (with a buzzing noise) then go right back out.
I have read that disconnecting the K8L connector should cause the backlights to stay on for a longer period of time, but when I tried it the only change was that I got the backlight flash immediately after pressing the power button instead of the 3sec delay that happens when K8L is connected.
Tests done so far: checked fuses on both inverter boards, checked voltages and they were ok.
A few times the TV would stay on (with a buzzing noise) and what looks like 3 darker lines going across the TV (bad ccfls I'm assuming)
What is causing the TV to work sometimes and not most of the other times?
can I "hot wire" the TV to run with a few bad bulbs or would that be dangerous?
thanks
Attached Files
I've been working on a 1984 Sanyo 27" color TV which had a smattering of bad caps in the video switching circuit. I found this oddball little 1uF 25V cap which looks to me like an early polymer, but I can't find concrete info proving it. I know Sanyo was a big player in early polymer cap development and this is the time period where they were just getting on the market, so I'm wondering if anyone has crusty old datasheets that could help identify it and determine if my suspicions are right? It has the same epoxy end seal and font/formatting as some old stock Os-Cons I've got laying...
