Sony KD-65A1 Repair – 4 Red Blinks Error
Hi everyone!
I have a Sony KD-65A1 TV with a fault – 4 red LED blinks. After disassembly and visual inspection, I found that the G76 power board and DKA board had been replaced. It is also possible that TCON was replaced, but I am not sure – there are a few marker marks that could be factory-made.
Based on assumptions, the previous service attempted to solve the issue by replacing potentially faulty components. I decided to investigate further, found a service manual, and figured out a way to power up the power supply unit autonomously and put the OLED panel and TCON into standalone mode.
Initial Diagnostics
As in many similar cases, disconnecting the lower ribbon cable from TCON helped bypass the error – the LED turned white, which theoretically meant that the TV was working correctly. However, I did not hear any sound.
I tried updating the device via USB – saw white blinking, then the LED turned blue.
From the beginning, I noticed a yellow spot (photo 1) in the lower-left corner of the panel frame, but I initially ignored it, thinking it was some sort of indicator or sensor.
Repair Attempts and Unexpected Results
After unsuccessful attempts with taping the EVDD_RESET and ERROR_DETECTION contacts, I finally tried OLED panel standalone mode.
The result (photo 2) was disappointing – no image appeared, and there was a dark spot resembling a broken panel.
Upon flashlight inspection, no visible cracks were found in that area.
Hypotheses and Questions
At this point, my assumption is that a factory defect in the lower-left corner caused a short circuit, which:
Melted the glass, leaving a noticeable bump.
Possibly damaged the decoders on the panel and TCON.
Unfortunately, there is no access to the panel’s boards where the decoder ribbon cables are attached – the rear part is sealed with glass.
My main questions now are:
1. Based on the photos, is there any chance of getting some kind of image from this panel?
Given OLED panel construction, a 24V power line runs along the perimeter of the panel (inside the frame). Since there is no more short circuit, does that mean the circuit is broken – and could this affect TCON signal output and the error state?
2. Theoretically, if I grind down the affected area with a rotary tool and restore the circuit using conductive adhesive, could this at least partially revive the panel (fully aware that the black spot will remain)? Or is it completely beyond repair?
Looking forward to hearing from anyone who has encountered similar issues!
I have a Sony KD-65A1 TV with a fault – 4 red LED blinks. After disassembly and visual inspection, I found that the G76 power board and DKA board had been replaced. It is also possible that TCON was replaced, but I am not sure – there are a few marker marks that could be factory-made.
Based on assumptions, the previous service attempted to solve the issue by replacing potentially faulty components. I decided to investigate further, found a service manual, and figured out a way to power up the power supply unit autonomously and put the OLED panel and TCON into standalone mode.
Initial Diagnostics
As in many similar cases, disconnecting the lower ribbon cable from TCON helped bypass the error – the LED turned white, which theoretically meant that the TV was working correctly. However, I did not hear any sound.
I tried updating the device via USB – saw white blinking, then the LED turned blue.
From the beginning, I noticed a yellow spot (photo 1) in the lower-left corner of the panel frame, but I initially ignored it, thinking it was some sort of indicator or sensor.
Repair Attempts and Unexpected Results
After unsuccessful attempts with taping the EVDD_RESET and ERROR_DETECTION contacts, I finally tried OLED panel standalone mode.
The result (photo 2) was disappointing – no image appeared, and there was a dark spot resembling a broken panel.
Upon flashlight inspection, no visible cracks were found in that area.
Hypotheses and Questions
At this point, my assumption is that a factory defect in the lower-left corner caused a short circuit, which:
Melted the glass, leaving a noticeable bump.
Possibly damaged the decoders on the panel and TCON.
Unfortunately, there is no access to the panel’s boards where the decoder ribbon cables are attached – the rear part is sealed with glass.
My main questions now are:
1. Based on the photos, is there any chance of getting some kind of image from this panel?
Given OLED panel construction, a 24V power line runs along the perimeter of the panel (inside the frame). Since there is no more short circuit, does that mean the circuit is broken – and could this affect TCON signal output and the error state?
2. Theoretically, if I grind down the affected area with a rotary tool and restore the circuit using conductive adhesive, could this at least partially revive the panel (fully aware that the black spot will remain)? Or is it completely beyond repair?
Looking forward to hearing from anyone who has encountered similar issues!
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