Technical description and composition of the PHILIPS 13PF7835 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 13PF7835 / 58
Chassis / Version: LC13E AA
Panel: LC130V01-A2
Inverter (backlight): T50I034.02 rev: 0
PWM Inverter: LM339A (14),
MOSFET Inverter: 2SD1804
Power Supply (PSU): Adapter EA1050A-120
MainBoard: 3139-123-5712.2
IC MainBoard: AN7522N, TDA8885H, MSP3410G
Tuner: UR1316 / A I H-3
Specifications 13PF7835
PHILIPS 13PF7835
General recommendations for repairing TV LCD
Any repair of electronic equipment usually begins with a careful external inspection of the device and troubleshooting. In this case, you should inspect all the elements of the PHILIPS 13PF7835 / 58 TV, both internal and external. Often, for certain external signs, it is possible to draw certain conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
Sometimes the PHILIPS 13PF7835 / 58 TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the EA1050A-120 adapter common power module. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is broken in the power supply, in most cases a breakdown of the power switch is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
It should be remembered that the N-FET keys used in flyback converters rarely fail without their own sake without any reasons that must be sought by checking other elements of the circuit. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip can also cause a breakdown of the power switch of the converter.
When using a power factor correction unit (PFC) in the power modules, troubleshooting becomes somewhat more complicated and requires additional experience and knowledge of the device for their operation.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (power converter for the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter feeding the inverter should be checked.
Repairing the T50I034.02 rev: 0 inverter is difficult because in case of any malfunction or abnormal situation, even if the lamps are unevenly worn, protection is triggered, which turns it off for fire safety purposes. Diagnostics become impossible and protection needs to be disabled.
In such cases, special care should be taken during diagnostics, and after completion of all repair work it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
Repair of the motherboard must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM. In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - AN7522N, TDA8885H, MSP3410G with new or obviously good ones.
We recommend the owners of the 13PF7835 / 58 TV for repair only to qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
Service manual and schematic diagram 13PF7835/58 Chassis LC13E AA
The appearance of MainBoard 3139-123-5712.2 is shown in the figure below:3139-123-5712.2
3139-123-5712.2 can be used in televisions:
PHILIPS 13PF7835/58 (Panel LC130V01-A2), PHILIPS 20PF7835/58 (Panel LC201V02-A3).
Main features of the PHILIPS 13PF7835 device:
Installed matrix (LCD panel) LC130V01-A2.
To power the backlight, an inverter T50I034.02 is used, it is controlled by the PWM controller LM339A (14) ,. As power elements of the inverter, keys of the type 2SD1804 are used.
To power all the internal components of the PHILIPS 13PF7835 TV, an external adapter type EA1050A-120 is used.
MainBoard - the main board (motherboard) is a module 3139-123-5712.2, using chips AN7522N, TDA8885H, MSP3410G and others.
The tuner UR1316 / A I H-3 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC130V01-A2
Type: a-Si TFT-LCD, Panel
Diagonal size: 13.0 inch
Resolution: 640x480, VGA
Display Mode: TN, Normally White, Transmissive
Active Area: 264.96x198.72 mm
Surface: Antiglare (Haze 13%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 400: 1
Display Colors: 16.2M (6-bit + FRC)
Response Time: 4/12 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: CMOS (1 ch, 8-bit), 41 pins
Voltage: 3.3V (VLCD)
