PIONEER AVX7000 I
Manual de Servicio

AVX-P7000CD,AVX-7000

YES RGB signal for LCD is obtained at Pin-48, NO Pin-50, and Pin-52 of Q201 (NJW1300A)? Replace Q201 (NJW1300A).

Blanking (BLK) signal is obtained at Pin-9 to Pin-11 of Q208 (74HC4053)?

Check CN003 (30-pin flexible connector) and its periphery.

RGB signal for LCD is obtained at Pin-2 to Pin-4 of CN003 (30-pin flexible connector)?

Check Q208 (74HC4053) and its periphery.

Normal signal is obtained at each terminals of CN003?

Check CN003 (30-pin flexible connector) and its periphery.

Replace LCD module.

2Back light doesn't turn ON.

Back light doesn't turn ON. NO F101 (fuse) is broken out? YES 5V is obtained at Pin-8 of Q104 (NJM2403)? NO

Replace F101. NO Check Q103 (3-terminal regulator) and its periphery.

Dimmer voltage (1.35V to 3.9V) is obtained at pin-2 of Q104 (NJM2403)?

Check input flexible cables and their periphery.

At Dimmer mode, triangular waves are obtained at Pin-6 of Q104 (NJM2403)?

Check Q104 (NJM2403) and its periphery.

At Dimmer mode, 0/5V rectangular waves are obtained at Q108 (TR)?

Check Q104 (NJM2403) and its periphery.

At 100% dimmer mode, ON voltage (about 0.7V) is obtained at the base of Q105 (TR)?

Check Q105, Q108, and their periphery.

Half-wave oscillating waveform is obtained at both ends of C110 (film capacitor)?

Check the primary windings of Inverter transformer.

High voltage is obtained at pin-1 and Pin-3 of CN004?

Replace T101 and T102 (Inverter transformer).

Check CN004 and replace back light.

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