Picture Display - Haier L42A9-AK Service Manual

U8 SAA7117: The SAA7117(A)E/H is a consequent derivate of SAA7118 X-VIP

multistandard video decoder. In addition to its predecessor, it provides 10 bit A/D-

conversion, enhanced PAL/NTSC comb filtering, more versatile VBI data processing,support

of High Definition component video, picture improvement processing, and more robustness

with VCR-type signals.

B: Debug flow-chart

Initialization:

*Vs on

+60 +190 FOUND

AC ON

Power board:

STANDBY +5V FOUND

System Reset

Power On

YES

+9V +12V +5V

+2.5V +3.3V +1.8V

FOUND

SvpEx Reset

Svpex E0 Good

InitAppHas Accomplish

GOOD

Whether

NO

input

Power failure

SvpEx E0 error

*SvpEx no ack.

* SvpEx communicate with

MCU was wrong.

Non integrity

SvpEx communicate with

*

alternating

current

*Repair power board.

*Replace fuse.

*Check dc-dc circuit

and LDO circuit.

DDR was wrong.