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Standby pulsing at switch on also low gain tuner clearing after warm up

Help needed at switch on the stand by led flashes several times between red and green, the tv eventualyy comes on . But the tuner is low gain for quite some time, then the picture becomes clear sharp and normal. The scart picture is ok all the time.
Can anyone help
The television is a JVC model AV-25SX1EK

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  • Gensec Feb 10, 2008

    help please

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Sound like you have a cold solder joint in the power supply section. If you are familiar at all with soldering you may be able to repair the unit. If you are not a tech I would suggest letting one take care of the problem. If you cause a solder bridge in the circuits, you could cause catastrophic damage.... Have you tried hitting the side of the tv while it is having problems coming on? Sometimes lifting the side a fraction of an inch and dropping it, just enough to jar the unit, can show loose connections. If it works then this is definitely your problem. Modern solder systems just don't always get the job done correctly..

Posted on Feb 10, 2008

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6ya6ya
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Posted on Jan 02, 2017

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RED STAND/BY LIGHT WILL COME ON BLINK SEVERAL TIMES, HEAR A CLICK SOUND A FEW TIMES BUT TV WILL NOT COME ON,


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Hi, the computer is under the passenger's seat. Code extraction procedure is pasted below.


READING CODES Modes will not switch while the engine is running. The ECM automatically switches to MODE I when the ignition is switchedOFF.
1984-90 Vehicles With Dual LED System
The self-diagnostic system has 5 modes. To switch modes, switch the ignition ON and use a screwdriver to turn the mode select switch through the access port on the ECM. The inspection lights will begin to flash. When the desired mode has been entered, turn the screwdriver fully counterclockwise. The red LED and green LED perform different functions in different modes.
Mode I-
This is the normal vehicle operating mode. The green LED will indicate loop status. If the green LED is not blinking when the engine is running, the vehicle is in open loop, or the HO 2 S, O 2 S, or sensor circuit has a malfunction. If the green LED is blinking, the vehicle is in closed loop. If a malfunction takes place, the red LED and the MIL will glow, indicating a malfunction has occurred.
Mode II-
Both the red LED and green LED are used to monitor mixture ratio feedback control. The green LED will function as described in MODE I. If vehicle is in open loop, the red LED and green LED will remain on or off. In order for results to be valid, vehicle must be in closed loop. In closed loop, the red LED remains off if the system is running rich, comes on if the system is running lean, and blinks at the same time with the green LED if system is within 5% of the exact air/fuel ratio.
Mode III
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Mode IV-
This mode is used for checking the throttle plate (TP) switch, starter, and vehicle speed switch status. When the TP switch or starter switch is activated, the red LED will briefly flash as the status changes. For VSS status, the green LED will remain off when vehicle speed is less than 12 mph (19 km/h) and come on when vehicle speed is greater than 12 mph (19 km/h).
Mode V-
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1 pulse-CMP sensor signal lost or noise in signal 2 pulses-MAF Sensor signal abnormal 3 pulses-Fuel pump circuit shorted or open 4 pulses-Ignition signal lost

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5V Stand-By Indicator LED
The power supply will always supply a 5V standby voltage to your
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technology. This LED shows that your power supply is supplying
this standby voltage to your motherboard.n :D

You may need to replace your power supply, if the LED is flashing, it's not supplying the power the motherboard needs.

[JP-25]

1 2 3 4 5 6 7 8 9
. . . . . . . . .
. . . . . . . .
10 11 12 13 14 15 16 17 18


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17] HDD Led (+)
18] HDD Led (-)


For future reference you can download your motherboard manual here:
(PDF) Soyo K7VKP2

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