REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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Tuesday 11 February 2020

REPAIR / SERVICING TV PHILIPS 30PF9946

Technical description and composition of the PHILIPS 30PF9946 TV, type of panel and applicable modules. The composition of the modules.
PHILIPS
Model: 30PF9946 / 12
Chassis / Version: LC4.6E AA
Panel: T296XW01
Inverter (backlight): V144-301 E206453
PWM Inverter: OZ960G (20N) PL LM393 (8N) PL
MOSFET Inverter: FDS8958A (8 pin). DK QP.
Trans Inverter: 4006A422094 690 ohm
Power Supply (PSU): 3104_303_38755 3104 303 38755 // 3104 328 30802
PWM Power: LM393 (8H) PL
MainBoard: 3139_123_58382 3139 123 5838.2 WK420.2 3104 328 32746
IC MainBoard: TDA15021H, K4D26323BF-0C50, gm1501
Tuner: UV1318S / A I H-3 3139 147 19801A
Control: RC4333 / 01
PHILIPS
Model: 30PF9946 / 12
Chassis / Version: LC4.6E AA
Panel: T296XW01
Inverter (backlight): V144-301 E206453
PWM Inverter: OZ960G (20n) pl
MOSFET Inverter: FDS8958A (8 pin). DK QP.
Power Supply (PSU): 3104_303_38755 3104 303 38755
PWM Power: LM393 (8H) PL
MainBoard: 3139_123_58382 3139 123 5838.2
IC MainBoard: TDA15021H, K4D26323BF-0C50, gm1501
Tuner: UV1318S / A
Specifications 30PF9946
PHILIPS 30PF9946
General recommendations for repairing TV LCD
Repair of all electronic devices, including the PHILIPS 30PF9946 / 12 TV, it is advisable to start with an external examination of its external and internal elements. You should also pay attention to the condition of the case elements, connectors, cords, loops and buttons. Specific external damage to the elements can sometimes prompt further actions to determine the malfunction of the TV and localize the defect before the necessary measurements and waveforms are taken. 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.
Power Module Repair
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain probability that the power module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, which is typical for certain PHILIPS models and happens much less often. Diagnostics and repair of the common power supply should always begin with a check of the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse is broken, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the rectifier diode bridge of the network, as well as the large electrolytic capacitor of the filter of the network rectifier and the key transistor.
Power switches in flyback converters fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The reason may be a malfunction of the PWM controller chip LM393 (8n) pl, which can only be checked by replacing with a new or obviously working one.
In cases where the Power Factor Corrector (PFC) is used in the power supply, troubleshooting can be a bit more complicated.
Inverter Repair
Sometimes the PHILIPS 30PF9946 / 12 TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including the power supply unit (power supply unit).
The operation of the power circuits of the inverter and the backlight in the normal mode are controlled by special protection, which is organized for fire safety, for example, to disconnect during short circuits or breaks in high-voltage connections or when the lamps are depressurized. This protection makes it difficult to diagnose and repair the inverter.
All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
We recommend the owners of the 30PF9946 / 12 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 30PF9946/12 Chassis LC4.6E AA


 The appearance of MainBoard 3139_123_58382 is shown in the figure below:
3139_123_58382
3139_123_58382 can be used on TVs:
PHILIPS 30PF9946 / 12 (Panel T296XW01), PHILIPS 30PF9946 / 12 (Panel T296XW01).
The appearance of the power supply
Main features of the PHILIPS 30PF9946 device:
Installed matrix (LCD-panel) T296XW01.
A V144-301 inverter is used to power the backlight, controlled by an OZ960G PWM controller (20n),  As power elements of the inverter, keys of the FDS8958A type (8 pin) are used. DK QP ..
The necessary supply voltages for all nodes of the PHILIPS 30PF9946 television are generated by the power supply module 3104_303_38755, or its analogs using microcircuits LM393 (8n) ......
MainBoard - the main board (motherboard) is a module 3139_123_58382, using TDA15021H, K4D26323BF-0C50, gm1501 and others.
The UV1318S / A tuner allows you to receive television programs and tune to channels.
Additional technical information about the panel:
Brand: AUO
Model: T296XW01 V3
Type: a-Si TFT-LCD, Panel
Diagonal size: 29.5 inch
Resolution: 1280x768, WXGA
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 643.2x385.92 mm
Surface: Hard coating (2H), Antireflection
Brightness: 600 cd / m²
Contrast Ratio: 750: 1
Display Colors: 16.7M (8-bit)
Response Time: 14/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 12.0V
Posted By: FRANK at 06:40
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