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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Saturday 8 February 2020

REPAIRING / SERVICING TV PHILIPS 20PFL5122

Technical description and composition of the PHILIPS 20PFL5122 TV, type of panel and applicable modules. The composition of the modules.
PHILIPS
Model: 20PFL5122 / 58
Chassis / Version: LC4.1E AC
Panel: A201SN02 V.5
Inverter (backlight): integrated into PSU
PWM Inverter: UBA2070T (16)
Power Supply (PSU): BL6L70PS10 / J2 24741 BL6L70S10 / J1 LPL
PWM Power: TY72011AP2 (14pin)
MOSFET Power: P16NF06FP P5NK50ZFP P6NK60ZFP
MainBoard: 3139_123_60192 3139 123 60192 Wk534.3
IC MainBoard: CPU: TDA15021H1 / N1C91; Scaler: GM5221H-LF
Tuner: UR1316S / A I H-3 3139 147 23021A
Technical Specifications 20PFL5122
PHILIPS 20PFL5122
General recommendations for repairing TV LCD
It is advisable to start any repair and diagnostics of the PHILIPS 20PFL5122 / 58 TV, as well as other devices, with a careful external examination of internal and external elements, including case parts, a display, buttons, and cables. Visible damage to elements can sometimes suggest directions for troubleshooting even before the necessary measurements are taken. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
In the absence of any signs of operability, when the PHILIPS 20PFL5122 / 58 does not turn on and does not signal anything with the control lights on the panel, the power supply module BL6L70PS10 / J2 24741 BL6L70S10 / J1 LPL is most likely to be faulty. 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 P16NF06FP P5NK50ZFP P6NK60ZFP 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.
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 TY72011AP2 (14n) UBF2070T (16n) pl PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
In cases using a power module with an active KKM, troubleshooting is sometimes somewhat more complicated.
Sometimes the PHILIPS 20PFL5122 / 58 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 in the power supply unit (power supply unit).
Diagnostics of the LIPS inverter can be difficult due to the operation of the protection, which is organized by the designers to prevent negative consequences or fires in emergency cases, for example, during short circuits or breaks in the lamp power supply circuit, as well as their possible depressurization. To make the necessary measurements at control points or to take the necessary waveforms, repairmen have to block the protection circuits in order to be able to diagnose.
It should be remembered that when the protection is turned off, there is always a risk of failure of the power elements of the inverter during diagnosis. After repair, it is necessary to restore all standard converter protection circuits.
Diagnosis and repair of the motherboard is carried out by checking the operability of the stabilizers or power converters of the module chips. In some cases, a software update is required.
Owners and users of the PHILIPS 20PFL5122 / 58 TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!


Service manual and schematic diagram 20PFL5122/58 Chassis LC4.1E AC

MODELS:  20PFL5122, 23PFL5322.



 The appearance of MainBoard 3139_123_60192 is shown in the figure below:
3139_123_60192
3139_123_60192 can be used in TVs:
PHILIPS 20PF4110S/58 (Panel LC201V02 (SD)(B1)), PHILIPS 15PF4121/58 (Panel LC150X02 (TL)(01)), PHILIPS 15PF5120/58 (Panel LC150X02), PHILIPS 15PF5121/58 (Panel IDM69E1S51718 Rev:01 QD15XL16 ), PHILIPS 15PF5121/58 (Panel T150XG01 V.3), PHILIPS 20HF5474/10 (Panel LC201V02 (SD)(D1)), PHILIPS 20PF4121/58 (Panel LC201V02 (SD)(B1)), PHILIPS 20PF5120/58 (Panel A201SN02 V4), PHILIPS 20PF5320/58 (Panel LC200WX1 (SL)(01)), PHILIPS 20PFL4101S/60 (Panel LC201V02 SD B1), PHILIPS 20PFL4102S/60 (Panel LC201V02 (SD)(D1)), PHILIPS 20PFL4102S/60 (Panel LC201V02 (CD)(B1)), PHILIPS 20PFL4112S/60 (Panel LC201V02 (SD)(B1)), PHILIPS 20PFL4112S/60 (Panel LC201V02 SD D1), PHILIPS 20PFL4122/58 (Panel A201SN02 V.5), PHILIPS 20PFL5122/58 (Panel A201SN02 V.5), PHILIPS 23PFL5322/58 (Panel T230XW01 V.3), PHILIPS 23PF4321/58 (Panel T230XW01 V.2).
The appearance of the power supply
Main features of the PHILIPS 20PFL5122 device:
Installed matrix (LCD panel) A201SN02 V.5.
To power the backlight lamps, a converter is used, combined with a power supply unit, controlled by a UBA2070T PWM controller (16).
The necessary supply voltages for all nodes of the PHILIPS 20PFL5122 television are generated by the BL6L70PS10 power supply module or its analogs using TY72011AP2 microcircuits (14pin) and power switches of the P16NF06FP P5NK50ZFP P6NK60ZFP type.
MainBoard - the main board (motherboard) is a module 3139_123_60192, using CPU chips: TDA15021H1 / N1C91; Scaler: GM5221H-LF and others.
The tuner UR1316S / A I H-3 3139 147 23021A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: A201SN02 V5
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 800x600, SVGA
Display Mode: TN, Normally White, Transmissive
Active Area: 408x306 mm
Surface: Antiglare
Brightness: 450 cd / m²
Contrast Ratio: 700: 1
Display Colors: 16.2M (6-bit + FRC), CIE1931 72%
Response Time: 11/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: TTL (1 ch, 8-bit), 50 pins
Voltage: 5.0V
Posted By: FRANK at 07:26
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