SAMSUNG PS42D5SX/XEC_PS42D5SX/XSG_PS42D5SX/XTL _ SMPS
[Power supply regulator board] – VOLTAGES – PROTECTIONS
SAMSUNG 42" & 50" PLASMA TV - SMPS OUTLINE
Considering various related conditions, the switching
regulator with good efficiency and allowing for its small size and light weight
was used as the power supply for PDP 42" (Schubert) / 50" (Strauss), VS
requiring high power consumption Asymmetrical Half Bridge converter and fly
back converter. To comply with the international harmonics standards and
improve the power factor, active PFC (Power Factor Correction) was used to
rectify AC input into +400V DC output, which in turns used as input to the
switching regulator.
An output short circuit is defined as output impedance of less
than 300Mohms. The power supply shall shutdown and latch off for shorting VS DC
rails to return. Shorts between main output rails and STD_5V shall not cause
any damages to the power supply. The
power supply shall either shutdown and latch off for shorting is removed, the
P/S shall recover. The power supply shall be capable of withstanding a
continuous short-circuit to the output without damage or over stress to the
unit (components, PCB traces, connectors, etc.) under the input conditions
specified in Section 3 above. Current Protection as defined below.
The over voltage sense circuitry and reference shall reside in
package that are separate and distinct from the regulator control circuitry and
reference. No single point fault shall be able to cause a sustained over
voltage condition on any of all outputs. The supply shall provide latch-mode
Over Voltage Protection as defined below.
INPUT
The power supply shall be capable of supplying full rated output
power over free voltage ranges that are rated 100 VAC - 240 VAC RMS nominal.
Operating voltage : 90 VAC - 264 VAC The power supply must be able to start up
under peak loading at 90VAC. The power supply shall automatically recover from
AC power loss. (Note that nominal voltages for test purposes are considered to
be with +/- 1.0V of nominal). STD_5V
& Vpr2 (3.3V) is a SELV standby voltage that is always present when AC mains
voltage present.
[Normally there is no repair to these SMPS boards, except for damaged or bulged main filter capacitor replacement. It is advised to replace it as card basis. After SMPS board replacement, Va & Vs voltages to display panel should be adjusted as per indication at the silk-screen at the panel. These voltages will differ to panel to panel.]
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