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!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Saturday, 6 April 2019

PHILIPS 21PT9457- 55 – FLAT CRT TV. CIRCUIT DIAGRAM AND ADJUSTMENTS

- 55 – Flat CRT TV. Circuit diagram and adjustments

This chassis does not contain a specific Service mode. The Services and device setting can be made via Mode the Technical Assistance Factory.
There is no program on TV
Check method: Check the closed circuit to the tuner IC image encoder for detecting whether components defective. Or check if the resistance R117, R118, R203 and R204 has increased may cause the problem.
No Good Picture or Dual Image
Check the signal IF1 / IF2 to Q101 and relevant circuit. In this case the problem can be Q101 and / or SAW 101.
No Picture or Color Correct
• Check the circuit IC201 to RGB.
• Check the welding IC and physical damage of the relevant circuit or check defective capacitors.
Image with White Line Horizontal and Audio
Check voltage supply of vertical IC301 and circuit relevant, and check the vertical sync signal IC201.
Control Evil Operation Remote
Check voltage at pin 64 of IC201. The normal value should be 5.15V. If correct check the welding connections front control panel. If it cannot be resolved check remote control, remote transmission or crystal diode are in good condition.
Without audio
Check audio power IC (IC402) and relevant circuit.
Check BTSC panel, the power of the IC801 and signal output pins 21:27 this IC. Do not delete the IC801 and / or IC402 may be faulty. If necessary, replace the speakers.
Bad Quality Audio
Check the audio system after searching the channel that should be NTSC or AUTO. If the problem persists, check the panel circuit is good chassis or not.
Main voltage adjustment
To adjust the main voltage, connect a voltage meter the diode D610 and cathode VR601 adjustment to the voltage 110 V + -0.3V.
Circuit diagram (Schematic) and PWB [Click on the pictures to magnify]
SMPS (split)
Sub-woofer
Block diagram
Adjustment mode flow chart
Factory Mode adjustment procedure
Software settings
Place evenly-matched in the MENU mode (the default mode) as follows (see "Factory Mode" figure on the next page:
> Press the [i +] keys, "smart sound" and "smart picture" for enter the factory menu.
> Press the [i +] again and "ADJUST" appears on screen.
> Press the number keys to enter the set page, press the Up/Dn keys to change the items that have been set, press the Left/Right keys to adjust their values .
> Press [i +] to exit the factory mode.
The different parameter settings are described above.
Posted By: FRANK at 02:33
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