Hi I'm new to trying to repair TVs, but I saw a broken OLED offered for a reasonable price and thought I'd try my hand at it.
I found the service manual, which was critical to know where to probe.
https://www.manualslib.com/manual/20...1e-Series.html
With it I was able to determine that my DKA board was bad, when P_ON#1/2 gets enabled REG_12 on the DKA board collapses. I'm assuming one of the downstream regulators has a short, but I couldn't work out which rail/component and replaced the DKA board entirely.
Unfortunately the 5-blinks still persists.
I've gone through all the troubleshooting flow charts (even for fault codes that I don't have) and measured all the components that are called out and the rails. On the BKA board that's 1.5V, 1.05V, 3.3V, 5V, 1.8V and on the DKA board 3.3V, 1.5V, 1.1V & 1.0V. The TCON board only takes in TCON_12V & TCON_24V but neither of these rails are up because the DKA is not asserting TCON_12_ON or TCON_24_ON. I also ohm'd through all the fuses.
The only step in the 5x blinks troubleshooting flow is to measure TCON_12_ON and if it's not asserting replace the DKA, which I've already done.
In the Troubleshooting Triage table it says that the TCON board is the most likely culprit for 5x blinks, so I also replaced that. Still no luck.
I've visually checked the harness wiring and flex cables under a microscope and didn't see any obvious faults. I ohm'd through some of wiring I thought might be critical such as the I2C lines between the DKA & BKA.
Does anyone have any suggestions I'm overlooking?
Any ideas why the DKA board isn't asserting TCON_12_ON and TCON_24_ON?
I verified that the power supply will generate those voltages if the DKA asserts those lines. Is it a good idea or bad idea to try to jumper from 3.3V standby to TCON_12_ON?
Does anyone know the function of AC_DET_IN on the DKA? This measures as 3.0V and routes to AC_OFF_DET on the power supply board. But I couldn't work out which board is supposed to be generating this signal and what its expected state is.
I'd appreciate any help! Thanks!
I found the service manual, which was critical to know where to probe.
https://www.manualslib.com/manual/20...1e-Series.html
With it I was able to determine that my DKA board was bad, when P_ON#1/2 gets enabled REG_12 on the DKA board collapses. I'm assuming one of the downstream regulators has a short, but I couldn't work out which rail/component and replaced the DKA board entirely.
Unfortunately the 5-blinks still persists.
I've gone through all the troubleshooting flow charts (even for fault codes that I don't have) and measured all the components that are called out and the rails. On the BKA board that's 1.5V, 1.05V, 3.3V, 5V, 1.8V and on the DKA board 3.3V, 1.5V, 1.1V & 1.0V. The TCON board only takes in TCON_12V & TCON_24V but neither of these rails are up because the DKA is not asserting TCON_12_ON or TCON_24_ON. I also ohm'd through all the fuses.
The only step in the 5x blinks troubleshooting flow is to measure TCON_12_ON and if it's not asserting replace the DKA, which I've already done.
In the Troubleshooting Triage table it says that the TCON board is the most likely culprit for 5x blinks, so I also replaced that. Still no luck.
I've visually checked the harness wiring and flex cables under a microscope and didn't see any obvious faults. I ohm'd through some of wiring I thought might be critical such as the I2C lines between the DKA & BKA.
Does anyone have any suggestions I'm overlooking?
Any ideas why the DKA board isn't asserting TCON_12_ON and TCON_24_ON?
I verified that the power supply will generate those voltages if the DKA asserts those lines. Is it a good idea or bad idea to try to jumper from 3.3V standby to TCON_12_ON?
Does anyone know the function of AC_DET_IN on the DKA? This measures as 3.0V and routes to AC_OFF_DET on the power supply board. But I couldn't work out which board is supposed to be generating this signal and what its expected state is.
I'd appreciate any help! Thanks!
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