On Sony TVs, 2 blinks (OCP) and 3 blinks (OVP) are both power‑supply‑related protection codes, but they flag different types of runaway faults in the same power section.
What OCP (2 blinks) means
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“OCP” = Over Current Protection (2 blinks)
The TV detects that the B+ line is drawing too much current, as if there is a short or heavy overload somewhere in the power‑supply or its downstream circuits. -
Typical behaviour
The TV may power on, then immediately shut down with the LED blinking twice, sometimes repeating the cycle. -
Common causes
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Shorted capacitors, MOSFETs, or ICs on the power‑board or main board.
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A short in the B+ load path (e.g., rectifier diodes, DC‑DC stages, or an overloaded module such as the backlight or audio section).
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In short, OCP (2 blinks) = too much current; the TV is acting like the power rail is being short‑circuited and cuts off to protect itself.
What OVP (3 blinks) means
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“OVP” = Over Voltage Protection (3 blinks)
The TV senses that the B+ voltage is too high, far above the designed rail level, and trips protection to avoid damaging sensitive boards. -
Typical behaviour
The TV may start, the LED will flash three times, and then it shuts down or returns to standby; the set never properly completes boot or stays on. -
Common causes
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Failed feedback‑side components (optocoupler, Zener/TL431, resistors) on the switching‑power section, which causes the regulator to over‑output.
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Worn or shorted regulators, defective DC‑DC stages, or a loss of proper regulation so the output voltage climbs instead of staying stable.
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In short, OVP (3 blinks) = too much voltage; the TV sees an over‑voltage condition and shuts down.
Key practical difference
In practice, if the TV keeps shutting down with 2 blinks, think short or heavy current draw; if it shuts down with 3 blinks, think out‑of‑control voltage regulation in the power‑supply circuit.