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TEST 4: (2015 EF Series OLED) Power Supply Board T-CON 12V and 24V Power
In this case, the Power Supply needs to be tested to see if it can supply the T-CON 24V and 12V when loaded.
TEST 4: 24V T-CON POWER LOAD CHECK:
(1) Leave all Jumpers in place on P2399 to P201 of the Power Supply and disconnect CN5 on the T-CON board.
(2) Make a 24V load test jig by using a standard 1157 automobile light bulb, (dual element). Solder two wires from the
buttons on the bottom of the bulb. Do not solder any wire to the actual ground of the bulb. (See Fig 4).
(3) Attach one end of the Jig to the 24V line from P203 pins 8-15 from the SMPS.
(4) Attach the other wire from the Jig to Chassis Ground.
Tip: To make insertion easy, cut the sharp end of a safety pin off
and solder it to each end of the wires coming from the light bulb Jig.
Push one needle end into one of the pins 8-14 of CN5.
Push the other needle end of the wire into any pin 1-7 of CN5.
(5) Apply AC to the power supply, the light bulb should light and remain lit.
Measure the 24V line to confirm it's correct. The bulb should be bright.
Let the SMPS run for several minutes to confirm its operating correctly.
(Do not let wires or light bulb touch any metal parts).
Note: You can also use two single element automotive bulbs (each 6W) tied in series.
a: If the Light Bulb remains lit, the panel is defective because the T-CON and/or the panel is providing too much of a
load causing the power supply to shut off.
b: If the SMPS shuts off, Replace the Power Supply.
TEST 5: 12V T-CON POWER LOAD CHECK:
Note: You can test the 12V to the T-CON line using the same procedure, but you only need one bulb. Use same
bulb, but solder one lead to a button and the other to the case.
g
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6
Fig 4
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