How to enter the SERVICE mode China TV kit using TDA9374 System-Chroma jungle – PF2939 chassis - Circuit diagram

Used semiconductors and transformers
STR-F6454R (SMPS control), TDA9384, TDA8360Q, TDA9859, TDA7057AQ, TA75558P, TDA7056B, TDA6107Q, HEF4053BP, AT24C08(Memory), TDQ-5B6M(Tuner), BSC68Z (FBT) 
How to enter the service mode
Set the volume to 0 by the remote control. Then press and hold the MUTE button on the remote control and MENU button on the TV at the same time for over 2 seconds. In the S mode, press the POWER button to quit the S mode.
Use the Dn/Upbuttons on the remote control to highlight an adjustment and the L/R buttons
to adjust it.
The POS +/-,UP/DN,L/R, 1~6, RECALL, VOL+/-, MUTE and POWER buttons on the remote control function in the S mode, but 100+, 7, 8, 9 and 0 buttons not.
Schematic

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AOC L32DS99X, AOC L42DS99X – LCD TVs – power supply (SMPS) Schematics

AOC L32DS99X, AOC L42DS99X – LCD TVs – Power supply regulator circuit diagram

AOC L32DS99X 715G3332P01H20003M SMPS

L32DS99X 715G3333-1

AOC L42DS99X 715G3351-1-HV

L42DS99X 715G3358-1

Sharp LC-32LE140E LCD TV – 17MB62 chassis – circuit diagram

Sharp LC-32LE140E, LC-32LE140EV, LC-32LE140EK, LC-32LE140RU - 17MB62 Chassis

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Power-1

Power-2

Tuner & Demodulator

RAM & NAND gate

Peripherals

LVDS

SMPS

Color TV – Slim and Ultra Slim type – Circuit diagram – 8899 or8897 Syscon IC

ET-SCE-KD4 / ET-SEE-K06(Tuner) – AN17821(Input selector) – 8899 / 8897 (Syscon-Chroma jungle) – 24C08(Memory) - STR-W6556A(SMPS Control) – STV8172(Vertical scan out) – BSC2601N4010E LOT for Slim type and BSC3601N4010F LOT for Ultra slim type

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LG LCD TV SMPS EAY60869402, EAY60869403, EAY60869405 – CIRCUIT DIAGRAM

LG 42LD450-UA,  LG 42LD550-UB, LG 42LD560, LG 32LD450-UA Power supply board

Used ICs: HS01G, STRW6053N, BD9270F-E2

On Condition: In a moment of Power ON Signal activated, the current of 3.5V output should be limited within 40mA(Max) at LCD TV condition for stability.

Do not turn “Power ON” Signal on at the load condition of 3.5V output, more than 40mA.
Total regulation for each output circuit includes the results of input voltage variation, load variation, warm-up drift and temperature change.
 The following instruments shall be used for measuring ripple noise.
1. Probe having impedance ratio of 1:1.
2. Oscilloscope having frequency characteristic of 100MHz or more.
Ripple and noise are measured at the end of output cable which are added a 0.1uF ceramic capacitor and 47uF electrolytic capacitor. (connected parallel )

Inverter Output Characteristics

“When doing inverter test, GND should be reinforced”

This Power Supply has above-mentioned protections.
 Short circuit protection between different output terminals is not considered.
 Trip point for over voltage indicates the operating point when the output voltage slowly increases.
 The conditions of Over Current measurement
Multi output(3.5V,12V,20V) is nominal load state except an over current measurement.

Inverter Test Method.

SMPS circuit diagram

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Grundig GDP1400 power supply regulator circuit diagram

SMPS circuit diagram Grundig DVD player GDP1400

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Philips AZ1004/78 Circuit diagram – Disassembly CD Stereo Radio Recorder

Voltage V - / 01: 120/230
Frequency - / 01: 50/60 Hz
Battery -: 9 V - R14 / UM-2 / C size x 6
Power consumption: 12 W
Dimensions (H x W x D): 360 x 225 x 152mm
Weight 3.3Kg
Tuning Ratio: 87.5 - 108 MHz
IF frequency: 10.7 MHz p 0.2 MHz

DISASSEMBLY (Click on the pictures to magnify)

A. REMOVE THE REAR CABINET

 Remove the 3 A1 screws (3x10)

 Remove the 5 screws A2 (3x30)

 Remove the Rear Cabinet.

B. REMOVE THE HAND STRAP

 Press the cover down and

Pull the handle.

 Remove the hand strap.

C. REMOVE THE TOP CABINET

- Remove the 2 C3 screws (3x20)

- Remove the screw C4 (3X10)

- Remove the Upper Cabinet.

D. REMOVE DECK MECHANISM

- Remove the 4 screws D5 (3x10)

- Remove the 4 C6 screws (2.5x10)

Circuit diagram (Schematic)