Hitachi 42pd300 schematic

TROUBLE-SHOOT CHART FOR VGA PANEL 42PD300TA/MA

PANEL
MODULE

YES

NO

YES

NO

P3

P2

5v

Va GND

Va: 65v

Vs GND

Vs : 185v

NO

Z-SUS PWB

YES

Va : 65v
Vs : 185v

NO

YES

pin 1: dc185v
pin 6: dc 65v

NO

YES

NO

YES

TP.Vs

NO

YES

NO

YES

yes

NO

1. Picture is not displayed ( LED is lighting )

Checked Low Voltages ( LV) at connector CNPPS for:
pin 1 : 30v , pin 4/5 : 5v , pin 8/9 : 12v & pin 12/13 : 10v.
Checked STB voltages at CN63 :
pin 1 : STB +5v , pin 3 : STB +3.3v

( Checked the voltages of CN807 pin 1 & 6 on the PSU PWB)

( * 1 )
*Reconnecting CN807 and goto next step
as follows:

Checked Vs voltage at P5 of Y-SUS CHANGED
PWB by removed P1 & P2. Y-SUS PWB BOARD

PPSU PWB BOARD

(Remove Connector P1 from Z-SUS PWB)
*Checked the voltages of pin 1 & 6 ,at CN807

(Insert by reconnecting P1 for Z-SUS PWB -

- Remove connector P2 & P3 from PDP42V6 _XR PWB.
(referring attached photo ) refer ( * 1 ) OF SAME PAGE.

( Reconnecting CN807 and checked follows)
Removed connector CN806 from PSU PWB to PSU PWB BOARD
Y-SUS PWB BOARD,checked Vs/Va voltages

- Checked the voltage for Va & Vs from Z-SUS PWB
( referring attached photo )

Removed P1 & P2 connecting of X-left and LVDS(CTRL)
PWB Board respectively,and checked and take measure
Vs voltage.

( Insert by reconnected P2 & P3 for Z-SUS from PDP42V6_XR BOARD)

- Checked P1 voltages for Va & Vs after removed connecting P1 & P2 from CTRL( LVDS ) PWB.
( referring attached photo illustrated )

Simulated by re-connecting P1/P2 CHECKED
and removed P702 from CTRL Board CTRL PWB

CHANGED X-LEFT PWB BOARD CHANGED CTRL PWB

By removed connector of
P109,P110 & P111
checked Vs/Va voltages

CHECKED ADM CHIP for any abnormal
burnt marks.

( Checked Va & Vs voltages by remove ADM CHIP

PANEL MODULE as photos illustrated.)

Checked CTRL PWB

flexi cables from connecting PDP42V6_XR Board ,

( If the surface appears negative;like
burning or if the Va/Vs voltages become normal
after isolate from connecting the ADM chip flexi cable )

CHANGED PANEL MODULE
( VGA )

**Checked each ADM chip condition from
observing each ADM surface.