Troubleshooting Flowcharts - Hitachi P50H401 Service Manual

[Power Supply troubleshooting]
No Power or
(No picture, and No sound)
Is Power Indicator
lit Orange?
No
Does Power Indicator
blink Red?
No
Does Power Indicator
blink Blue?
No
Is Power Indicator
Lit?
After pressing
Yes
power On.
Power Indicator
blue is lighted normally.
Does Power Supply Unit
output +10V/12V?
No
Check Power Supply Unit. (
) Power-On control signals for Power Supply Unit (PSU here after)
(1) AC (Master Power) switch : ON
(2) PoWER_1 (+3.3V CN63 pin 6) : High
(3) PoWER_2 (+3.3V CN63 pin 7) : High
(4) Vcego (+2.69V CN68 pin 7) : High
(5) Vsago (+2.69V CN68 pin 8) : High
If any control signal does not rise, Power Supply can not output the voltage.
PoWER_1 or _2 : does not rise ----- Suspect Main-Digital PWB trouble or connection.
Vcego/Vsago : does not rise ----- PDP Panel Module (Suspect Logic PWB) trouble or connection.
However, Vcego should rise when PNLRST (Connector EC01 pin 43 at Main-Digital board) outputs a High and
Vsago should rise when PNLoN (Connector EC01 pin 42 at Main-Digital board) also outputs a High. (See page 61 diagram)
TABLE OF CONTENTS
DW3 TROUBLESHOOTING FLOW CHARTS
Check power supply for damage (Cracks)and SDR IC's for Pin Holes.
Yes
Video Power Save Mode
(Input:1 3, Front Input have no signal)
Fan Alarm
Yes
- FAN connector disconnected, FAN trouble
or Regulator circuit (IP03 on Terminal PWB) trouble
Yes
PDP Module Alarm
- Refer to the page "PDP Panel self-diagnosis function" page 57.
No
Does Power Supply Unit
Check Power Supply Unit. (
or AC-Inlet / Connector
Yes
Does Power Supply Unit
Check Power Supply Unit. (
PSU outputs STBY+5V CN63 pin 1 and STBY +3.3V CN63 pin 3.
PSU outputs +5.6V.
PSU outputs +10V and +12V.
PSU outputs Vcc+5.1V for PDP Panel.
PSU outputs Va and Vs for PDP Panel.
Yes
output +5V?
For SBY+5V, check CN63 pin 1 (Always presentwith AC)
No
Yes
output Va/Vs?
No
Note: Power_1 and Power _2 are high
55
Check Main-Digital board.
also check Fuse
Burn-In mode = menu-menu-menu-9-select
pressed slowly. Repeat to Exit.
Does PDP Burn-In mode
operates normally?
No
Check PDP module.
Check Main-Digital board
or Terminal PWB
for the about 2 minutes when AC
is first applied or always high
if "Stand-By Mode" is turned on
in Customer's Menu.
DW3U
CH 2
Yes