I found this TV last week and haven't put much effort into it. It's kind of a lazy Saturday morning here so I decided to pull it out and have a look at it. There was an obviously bulged cap on the PSU. I swapped it out but still have the same issue. In standby, at the PSU, I have
12V = 12V
12V = 12v
12v = 12v
GND = 0v
GND = 0v
GND = 0v
D = 0V
C = 1.5V
At power up, the LED turns from amber to green, the backlights flash briefly (maybe a half second) and I see the following voltages
12V = 12V
12V = 12v
12v = 12v
GND = 0v
GND = 0v
GND = 0v
D = 3.5V
C = 1.5V
These voltages hold steady for ~3sec and then the 3.5V drops back out at which point the green LED reverts back to amber. On the main board, I have 3 fuses, they read
F1 = 12V steady on both sides
F3 = 5V steady on both sides
F2 = 3.3V steady on both sides
These voltages do not drop out when the PSU shuts off. I see one voltage regulator with a shape that I'm familiar with.
U20
38AU
N12A
3.3V
1.8V
0.1V
These voltages don't change at power up or standby.
I'm leaning towards a main board issue. I'm hoping this can be fixed at a component level. The only main boards that I can find for this set are ~$80 which is more than I really want to put into a 9 year old TV. If I can get this thing to just show a picture, I will be happy. My plan is to give it to my brother to use as a computer monitor.
12V = 12V
12V = 12v
12v = 12v
GND = 0v
GND = 0v
GND = 0v
D = 0V
C = 1.5V
At power up, the LED turns from amber to green, the backlights flash briefly (maybe a half second) and I see the following voltages
12V = 12V
12V = 12v
12v = 12v
GND = 0v
GND = 0v
GND = 0v
D = 3.5V
C = 1.5V
These voltages hold steady for ~3sec and then the 3.5V drops back out at which point the green LED reverts back to amber. On the main board, I have 3 fuses, they read
F1 = 12V steady on both sides
F3 = 5V steady on both sides
F2 = 3.3V steady on both sides
These voltages do not drop out when the PSU shuts off. I see one voltage regulator with a shape that I'm familiar with.
U20
38AU
N12A
3.3V
1.8V
0.1V
These voltages don't change at power up or standby.
I'm leaning towards a main board issue. I'm hoping this can be fixed at a component level. The only main boards that I can find for this set are ~$80 which is more than I really want to put into a 9 year old TV. If I can get this thing to just show a picture, I will be happy. My plan is to give it to my brother to use as a computer monitor.
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