Good morning Badcaps!
I picked up an Insignia NS-46E340A13 TV yesterday. The original owner says the TV sometimes takes minutes to hours to turn on and it's been in their garage for 6 months.
I searched the forum for this particular model number. Looks like there are two threads, but neither have their issues resolved (one guy didn't post any information, and the other guy never replied after declaring the EEPROM could be bad).
This morning, I got the TV to boot after 3-4 power cycles. I took the back panel off and observed the following:
Power board: 715G5173-P02-W21-002M / (T)CR248XF3
Main board: 715G5738-MOD-000-004K / (T)TXCCB0K090000TOP:A MB:A v2.02
(see photos)
The full list of voltages observed on connector CN902 are as follows (as observed from top to bottom when the board is installed):
Its interesting that the P_OK signal is sitting at 0V.. I would have expected this signal to be active high vs active low. Any ideas here?
There are no visibly bad caps on the power or main boards.
The fuses on the power board are good; same with the T-con fuse
I have cranked the brightness up to 100% in hopes of inducing a failure faster (if it's related to the backlights) -- but unlikely since the background looks very uniform when projecting a white background.
The TV turned off once -- and was coincident with when i was measuring the PS_ON signal. I took that as a fluke.
Any ideas on where to go from here guys?
Thanks
-Thomas
I picked up an Insignia NS-46E340A13 TV yesterday. The original owner says the TV sometimes takes minutes to hours to turn on and it's been in their garage for 6 months.
I searched the forum for this particular model number. Looks like there are two threads, but neither have their issues resolved (one guy didn't post any information, and the other guy never replied after declaring the EEPROM could be bad).
This morning, I got the TV to boot after 3-4 power cycles. I took the back panel off and observed the following:
Power board: 715G5173-P02-W21-002M / (T)CR248XF3
Main board: 715G5738-MOD-000-004K / (T)TXCCB0K090000TOP:A MB:A v2.02
(see photos)
- Upon applying AC power, the unit turns on.
- The backlights turn on
- The power ON_OFF signal is high (4.7V)
- The power rails are up (12V, 5.2V). The LED driver voltage is also up (75V)
- DIM is 2.56V (about 50% brightness according to the menu)
- The TV power cycles itself 3-4 times (power LED blinks 5x times, the backlights turn on, the Insignia logo shows up, backlights turn off, and the process repeats)
- After the 3-4 tries, the TV is up and running at this point. I can hook up my Chrome Cast and stream video to it just fine.
- Interestingly enough the P_OK signal stays low. Is the P_OK signal indication active low?
The full list of voltages observed on connector CN902 are as follows (as observed from top to bottom when the board is installed):
- CN902: (Volts)
- ON/OFF 4.7
- DIM 2.56
- 12V 12.39
- 12v 12.39
- GND 0
- GND 0
- GND 0
- 24V 0
- 24V 25.02
- PS_ON 5.16
- 5.2V 5.23
- 5.2V 5.23
- P_OK 0
Its interesting that the P_OK signal is sitting at 0V.. I would have expected this signal to be active high vs active low. Any ideas here?
There are no visibly bad caps on the power or main boards.
The fuses on the power board are good; same with the T-con fuse
I have cranked the brightness up to 100% in hopes of inducing a failure faster (if it's related to the backlights) -- but unlikely since the background looks very uniform when projecting a white background.
The TV turned off once -- and was coincident with when i was measuring the PS_ON signal. I took that as a fluke.
Any ideas on where to go from here guys?
Thanks
-Thomas
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