Applicable to Samsung Plasma TVs:
PL51E450A1FXZP
/ PN43E440A2FXZA / PN43E450A1FXZA / PN43E450A1FXZC / PN51E440A2FXZA /
PN51E450A1FXZA /PN51E450A1FXZC - Version: 1011.1
SMPS
PCB – BN44-005098
Power
Supply Trouble Shooting
2010/2011/2012
models will not be run when the “X“
or “Y” or “Y/X” Main are disconnected. The
SMPS will shut down immediately. How ever if a meter is first connected to the
test point when power is applied it will read the correct voltage briefly
before shutting down.(You have enough time to check key voltages)
Do
not reconnect any connectors to SMPS board or Y/X bard[s] until power has been
turned off long enough for Vs to drop below 10V or damage will occur to X/Y
board[s]
VITAL
SIGNS check Vs, Va, Vsc & Ve
When
troubleshooting, It’s very important to first check Vs, Va, Vsc & Ve
If
Vs is missing (0V), disconnect power and check for short. Use ohm meter to
measure resistance while disconnecting Y/X‐Board supply feed.
Turn
Power On and Test SMPS with short connector removed for correct Vs voltage
verification. (It may only come up briefly but to full level). Again be careful
not to reconnect Power Connectors until Vs falls below 10V.
If
Va is low or missing, disconnect Supply Feed to Logic Buffer Boards and check
to see if SMPS Supply is restored.
If
Vsc is low or missing and Vs was OK, the failure is with the Y/X‐
Board since the Y‐Board section generates the Vsc
voltage from the Vs supplied by the SMPS.
If
Ve is low or missing and Vs is OK, the failure is with the Y/X‐Board
since the Ve is generated by the X‐Board section
from the Vs supplied by the SMPS.
Other
SMPS Voltages:
Check Low Voltage feeds to the Main Board and other supplied Assemblies.
Check Low Voltage feeds to the Main Board and other supplied Assemblies.
Over
Current Protection
For
the SMPS Power Supply... If a short circuit occurs on either the VS or VA
voltage lines, the SMPS stops operating, but should not fail. When the short circuit is removed from the
source line, the power supply will operate normally again. Many SMPS supplies are replaced needlessly.
Activating
power and logic board test patterns without main board
E450
Power On Sequence
E450 Supply Adjustments
Function
control troubleshooting
TROUBLESHOOTING
VIDEO PROBLEMS
Verify
Video Operation:
A.
Customer Picture Test
B. “Display”
B. “Display”
C.
If display & Customer Picture Test are OK source is suspected.
D.
Substitute with known good source and cabling.
Using
Test Patterns in Service Mode:
Customer
Remote
A. Power off
B. Mute, 182, Power.
A. Power off
B. Mute, 182, Power.
Factory
Remote:
A. Power On
B Info Test.
A. Power On
B Info Test.
3.
Verify M‐STAR Patterns
4. Verify Logic Patterns.
4. Verify Logic Patterns.
If
Logic Patterns are OK and M‐ Star are noisy, replace the defective
LVDS Cable or Main Board.
If
M‐Star and Logic Patterns are and logic
patterns are both noisy check for specification screen noise error to determine
failure.
ON
SCREEN FAILURE EXAMPLES: NOTE: X/Y MAIN
Combined.
ALIGNMENTS:
Check/Adj.
VS, VA, VE, & VSC according to Panel Label and Diffusion test. (see
bulletins for any special notes before making changes)
DIFFUSION
TEST/ADJ. (cell miss‐firing)
‐ Allow the unit to warm up 15 to 20 minutes
‐ Access the Burn Protect Sig. Pattern in Cust. Menu.
‐Adj t ust the Vs volts until screen errors are gone in both dark and bright areas.
‐Adjust the Vs volts within +/‐ 10V on the panel label.
‐ Allow the unit to warm up 15 to 20 minutes
‐ Access the Burn Protect Sig. Pattern in Cust. Menu.
‐Adj t ust the Vs volts until screen errors are gone in both dark and bright areas.
‐Adjust the Vs volts within +/‐ 10V on the panel label.
[Diffusion
may appear with aging panels. New panels
with Diffusion consult bulletins and/or report problem]
Check/Set
Option Bytes:
PN43E450A1FXZA Table Listed below
PN43E450A1FXZA Table Listed below
PWBs
and part numbers
