CM4320 LG Mini Hi-Fi system – SMPS circuit diagram

Power supply regulator schematic – LGCM4320 Mini Hi-Fi

Circuit Diagram - SMPS

Click on the schematic to magnify

LGLP42SLPV2EV3 – LG 42 inch LCD TV SMPS - EAY34797001 Schematic

EAY34797001 - LG 42" LCD TV power supply circuit diagram

LG32LN530B LED LCD TV Power supply board – EAX64905001 – Circuit Diagram

LG 32 inch LED LCD TV 32LN530B SMPS Schematic.  Used ICs: SC1S311A [Power control] – MDF11N65B [Switching Output FET] – MAP3202 – NR891D

Circuit Diagram

Aiwa HT DV50 HTS – DVD system – Power Amplifier and SMPS circuit diagram - STR-F6676 – TA2020-020

Used ICs: STR-F6676 – TA2020-020. Optical pickup – SF-HD3AV / HD3AVC

Circuit diagram (Schematic)

PWB

Optical pick-up

Philips QFU2.1E Chassis LCD TV - SMPS circuits - troubleshooting

Power Supply Unit
For 32", 37", and 55" sets, power supply units should be repaired on component level.  All other power supplies are a black box for Service. When any of these power supplies is defective, a new board must be ordered and the defective one must be returned, unless the main fuse of the board is broken. Always replace a defective fuse with one with the correct specifications. This part is available in the regular market.
Replace safety components, indicated by the symbol , only by components identical to the original ones. Any other component substitution (other than original type) may increase risk of fire or electrical shock hazard.

PLDC-P109B (32" sets) and PLDD-P109A (37" sets)

The output voltages to the chassis are:
* V STB (+3.3 V; stand-by mode)
* V SSB (+12.3 V; on-mode)
* V SND (+12.3 V; audio circuit).

Test instructions 32" & 37"

* check fuse (F101)

* standby check VSTB (C306), measure 3.3 V

* PFC voltage check (C644), measure 380 - 400 V; if no PFC applied, measure 311 @ 220 V

* multi-level check V SSB (C203), measure 12.3 V

* multi-level check V SND (C206), measure 12.3V

* reference voltage check (U401), measure 5.96 V (appr.).

PLDK-P107B (55" sets)

The output voltages to the chassis are:

* V STB (+3.3 V; stand-by mode)

* V SSB (+12.3 V; on-mode)

* V SND (+12.3 V; audio circuit).

Test instructions 55"

* check fuse (F101)

* standby check VSTB (C301), measure 3.3 V

* PFC voltage check (C646), measure 380 - 400 V; if no PFC applied, measure 311 @ 220 V

* multi-level check V SSB (C203), measure 12.3 V

* multi-level check V SND (C202), measure 12.3V

* reference voltage check (U401), measure 5.96 V (appr.).

A 272217190604 - 272217190605 PSL. Power Supply Unit with Integrated LED Driver Schematic

A 272217190609 PSU Circuit diagram

A 272217190611 PSU Circuit diagram

Stereo Amplifier Circuit Diagram using Power Transistors

Power transistors with LM391 or at the entrance, preamp

Philips FR 680A Stereo Radiogram – Circuit Diagram

Tubes used: EL84 – ECC83 – ECH81 - EAA91 – EF184 – EF93 – EM80

Circuit Diagram

Philips BR 405A - AC-DC Radio - Circuit Diagram

Vacuum tubes used: ECH42 – EAF42 – EBC41 – EL42 – EM34 – AZ41

My age was 1-year; when this set was released by Philips in 1951.  Now I'm 67.

Circuit Diagram