Hi,
I have a Sony KD-65XE7096 (XBR-65X70E in some regions). This TV was refusing to turn on and showed a 2 blinks error code. After replacing the main board now the TV is fixed.
I would like to fix the main board itself. This board is the model BB8 and has the following id's/part numbers:
1-981-926-22
172657422
A2184797C
Googling for this board I've found a document called "Main board FY17 4K GN3UN-BB8 Easy Repair Guide_(GN3UN)", but I haven't been able to download it. Does anyone by any chance have it?
R666
Member
Last Activity: 01-22-2021, 06:03 AM
Joined: 01-22-2020
Location: Madrid
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Sony BB8 main board fix
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Re: Sony Bravia KD-65XE7096 with shorted power supply
Hi everyone.
I have some news about this problem. I've solved it by replacing the main board.
Many thanks to everybody who helped me, specially @R_J and @budm.
Can I ask the mods to change the title for this thread to "SOLVED: Sony Bravia KD-65XE7096 turns off with 2 blinks code"?. Also, since it's not a PS problem, this thread fits the most in the "Troubleshooting TVs and Video Sources" section.
I'll try to fix the faulty main board, but I'll open a new thread for that.
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Re: Sony Bravia KD-65XE7096 with shorted power supply
Oh, yes. I forgot to mention. Each led string is drawing 122V....Leave a comment:
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Re: Sony Bravia KD-65XE7096 with shorted power supply
This weekend I've managed to test the backlights with an led tester and they are all ok. Each pin of CN6801 controls one vertical array of leds (pin1 corresponds to the rightmost 1/4 of the screen).
After testing successfully all of them I tried to turn on the TV while keeping on one of the central arrays. Now I can see for a second the Sony logo in the center of the screen, just before the TV turns off again.
Now I know that TCON, backlights and panel are all ok. The fault must be on the power supply or...Leave a comment:
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Re: Sony Bravia KD-65XE7096 with shorted power supply
Also, located at the main board there's this tiny connector. Probably it's a service port. Could TV logs be accessed through this port? Anyone happen to have it's specs?...Last edited by R666; 01-28-2020, 10:18 AM.Leave a comment:
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Re: Sony Bravia KD-65XE7096 with shorted power supply
To summarise:
Sony TV that turns on for 1-2 seconds and then it turns off by itself. No sound and no backlights. Starts with a white status led, then a relay is triggered and the TV is shut down, left with a red led that blinks 2 times. According to Sony's documentation (attached) this code means that the power supply is bad.
I've taken the power supply off of the TV, no other boards are connected to it. I've connected POWER_ON, TCON_ON and BL_ON pins to STBY_3.3V pin to simulate the power on state of the TV. I've...Leave a comment:
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Re: Sony Bravia KD-65XE7096 with shorted power supply
Oh, and I haven't located R770A and R772A.Leave a comment:
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Re: Sony Bravia KD-65XE7096 with shorted power supply
Ooops! No, these resistors are ok. I just rechecked then because I was not confident that I did it right yesterday. My multimeter doesn't have multi range and it was set to read ohms, not I ohms.
What else can I check?Last edited by R666; 01-28-2020, 02:53 AM.Leave a comment:
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Re: Sony Bravia KD-65XE7096 with shorted power supply
I think I've found two broken resistors: R765A & R766A. They show no continuity, should be 100 kOhm). The rest of the resistors in the area are good.
Mosfets and diodes of the secondary seem good to me. I've tested them by measuring DS resistance:
Q750A: 400 stable
D751A: 550 stable
Q123: 500 and then increasing
D120A: 130 stable
D120B: 130 stable
Seems like I need to replace R765A & R766A.
NB: I've attached a picture of this area...Leave a comment:
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Re: Sony Bravia KD-65XE7096 with shorted power supply
The TV has no sound. Also backlights never get to be on, probably because the voltage doesn't get high enough. It only starts with a solid white led for 1-2 seconds and then makes a click sound and starts a secuence of 2 blinks of the red led. When the TV is turned on BL voltage goes to 97V. After 1-2 seconds, when the relay is heard (or maybe just before), it goes to 99V for a split second and then it drops slowly to 0.
I'll test the components you suggest and report back. Thanks a lot....Leave a comment:
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Re: Sony Bravia KD-65XE7096 with shorted power supply
Thank you. Done, but BL voltage is not getting higher than 97-99V, even when the power supply is out of the TV....Leave a comment:
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Re: Sony Bravia KD-65XE7096 with shorted power supply
Sorry, maybe the picture is confusing. Pins POWER_ON, BL_ON and TCON_ON have 3.3V because I connect them to STBY....Leave a comment:
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Re: Sony Bravia KD-65XE7096 with shorted power supply
Many thanks for your answer.
The description of the errors reported by the TV blinking the red light can be found in Sony's service manuals. I've attached a list of error codes and it's description.
Thanks for the info. Now this is solved, I just needed to activate TCON_ON.
I've connected again the main board and the voltage never goes higher than 97-99V at power on. With the main board and BL disconnected the voltage is the same.
BL_ERROR...Leave a comment:
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Re: Sony Bravia KD-65XE7096 with shorted power supply
Hi,
I've just tested the power supply while activating POWER_ON, BL_ON and TCON_ON and all voltages seem right except for BL. I've attached my readings at the connectors to main board and to BL.
+out to BL doesn't go much higher than 97-99V, even when the power on button is pressed. On the other hand, -out is always almost 0.
This is the same no matter if the main board is connected or not.
What can be the cause?...Leave a comment:
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Re: Sony Bravia KD-65XE7096 with shorted power supply
Thanks a lot for the prompt answer.
If the power supply is ok, then the TV is showing an incorrect error code. Is that common?
Will add the 1k resistors to activate TCON_ON and POWER_ON and report back.Leave a comment:
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Sony Bravia KD-65XE7096 with shorted power supply - SOLVED
Hi everyone,
I need some help repairing this power supply. I've been testing it and my conclusion is that it's sorted. Now I don't know how to find the faulty component. Can someone give me a hand?
The model number of the board is:
GL72
APDP-225A1 A
1-474-685-11
This is all the information I've gathered:
The TV does not turn on. When I push the on button a click is heard (the relay) and the red led shows the 2 blinks code (faulty power supply).
I've removed the power supply and these are the tests I've already done:...Last edited by SMDFlea; 10-21-2020, 09:29 AM. Reason: Changed thread title at OP`s request,moved to tv forum -
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Noscript.
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