Chosen Solution
Turn on the tv, runs for about 5 minutes, then shuts off with 4 red blinking lights. Tried hard reset/factory reset and the tv goes into reset mode, shows the Android logo, gets through setup, then shuts off. Tried to connect the BL_ERR to ground, but did not fix. Then replaced the power board with new board, still no fix. What next?
Hi @dave2849 The service manual, shows that a 4 blink error code may be a tcon board problem. (On p.3 it shows that this manual is also for your model TV) Update (10/15/2022) Hi @dave2849 The way to check if the manual is applicable to your TV is to see if the chassis number (GN4UR CHASSIS) matches. There’s also a few flowcharts in the manual that show what to check, for a 4 blink error on p.34 & p.36 Cheers
Hi All, So, I received the new TCON board and installed it into the XBR-55A8F tv and it started up with a GREEN and AMBER light, with the Android music in the background……… no picture. Went to the SONY help website and noticed that when new TCON board is installed the firmware is to be reloaded. So, I downloaded the firmware “.pkg” for my tv. Copied it to a flash drive, as SONY recommended, then inserted the flash drive into the USB port. The tv began with a WHITE blinking light (telling me that the tv was downloading the firmware for the tv). Then it rebooted and instantly, 4 RED lights began blinking again. So, replaced the POWER board and the TCON board, and back to square one. Any suggestions? Please advise, as I am now ready to call the tv repair techs to see what the problem is and the cost to fix. Thanks
Sorry for no update. Been away for a while. So now, replaced Power Board and TCON Board. No change. So, I figured that it was not these 2 boards and put the original boards back into the tv. Rebooted and now it is up and running…….for 3 hours last night, until I powered it down. The only thing, it blinks with a green/white light, where it used to blink 4 reds. I think that I need to update the firmware, so going to download the latest firmware from SONY and see what happens.
Since the TV runs for a bit b4 it turns off, I think you can eliminate BLOWN components. It is more likely and overheating problem causing a shutdown. Without burning yourself, see if you can find a somewhat HOT part. Power devices on a TCON board are typical failure points. The problem is finding it since it works for a while. You can use a DVM and measure base to emitter/collector or gate to drain/source on the power devices. Any shorted devices would probably cause an immediate shutdown so look for open devices which would cause the other devices to run hotter. Otherwise, it is a crap shoot - and you just replace the TCON and hope that is it.
