Pioneer AVX-P7000CDES Manuale di servizio - Pagina 14
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AVX-P7000CD,AVX-7000
YES
RGB signal for LCD is obtained at Pin-48,
Pin-50, and Pin-52 of Q201 (NJW1300A)?
Blanking (BLK) signal is obtained at
Pin-9 to Pin-11 of Q208 (74HC4053)?
RGB signal for LCD is obtained at Pin-2 to
Pin-4 of CN003 (30-pin flexible connector)?
Normal signal is obtained at each terminals of CN003?
Replace LCD module.
2
Back 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)?
Dimmer voltage (1.35V to 3.9V) is
obtained at pin-2 of Q104 (NJM2403)?
At Dimmer mode, triangular waves are
obtained at Pin-6 of Q104 (NJM2403)?
At Dimmer mode, 0/5V rectangular
waves are obtained at Q108 (TR)?
At 100% dimmer mode, ON voltage (about
0.7V) is obtained at the base of Q105 (TR)?
Half-wave oscillating waveform is obtained at
both ends of C110 (film capacitor)?
High voltage is obtained at pin-1 and Pin-3 of CN004?
Check CN004 and replace back light.
14
NO
Replace Q201 (NJW1300A).
Check CN003 (30-pin flexible connector) and its periphery.
Check Q208 (74HC4053) and its periphery.
Check CN003 (30-pin flexible con-
nector) and its periphery.
NO
Replace F101.
NO
Check Q103 (3-terminal regulator) and its periphery.
Check input flexible cables and their periphery.
Check Q104 (NJM2403) and its periphery.
Check Q104 (NJM2403) and its periphery.
Check Q105, Q108, and their periphery.
Check the primary windings of Inverter transformer.
Replace T101 and T102 (Inverter transformer).