PANEL-POWER CIRCUIT

check R225 should have response from 12V to 0V When we switch the power switch from on to off

OK,R225 have response

NG

Check the PPWR panel power relative circuit, R223, Q200,U202(pin 5,6,7,8)

In normal operation, when LED =green, R223 should =0 v,

If PPWR no-response when the power switch Turn on and turn off, replace the U200-GMZAN1

Measured the U202 pin 5,6,7,8= 5 V?

OK

OK

NG, no Voltage

Yes

Check U202 pin 1,2,3,4= 5V

Replace U202 ( Nmos, SI9933)

NG

Check U304 relative circuit.(R905,T300..)

INVERTER Control Relative Circuit

Measured the inveter connector CN303 Pin 1=12V, pin 3 on/off control=5V (on)

NG, still no screen

Replace INVERTER to new-one, and Check the screen is normal ??

OK

NG

NG

Check the Bklt-On relative circuit, R315, Q304, R311, In normal operation, when LED =green,

R315 Bklt-On should =0 v,

If Bklt-On no-response when the power switch turn on-off, Replace the MCU

Replace INVERTER-module & Re-do white balance

OSCILLATOR BLOCK

Measured U201 Oscillator output R215= 50mhZ ?

OK, has transition

Measured X300 Crystal output R340= 20mhZ ?

OK

U200-DATA OUTPUT

Measured PCLK(L207) PVS,PHS (pin 73,74 from U200 ) Is there have any transition? Pclk around 47MHz to 57MHZ , PVS=60.09Hz , PHS around 67 KHz ??(refer to input signal=640x480@60 Hz 31k, and LED is green)

OK

NG,no transition

Replace Oscillator U201

NG,no transition

Replace Crystal X300

NG , no transition

Replace GMZAN1 (U200) or replace

MAINBOARD.

If MainBoard being replace , please do the DDC – content reprogrammed

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AOC P/N : 41A50-144 service manual U200-DATA Output, PANEL-POWER Circuit, Mainboard

P/N : 41A50-144 specifications

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