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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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 QFU2.1E CHASSIS LCD TV - SMPS CIRCUITS - TROUBLESHOOTING

Philips QFU2.1E Chassis LCD TV - SMPS circuits - troubleshooting

Power Supply Unit
For 32", 37", and 55" sets, power supply units should be repaired on component level.  All other power supplies are a black box for Service. When any of these power supplies is defective, a new board must be ordered and the defective one must be returned, unless the main fuse of the board is broken. Always replace a defective fuse with one with the correct specifications. This part is available in the regular market.
Replace safety components, indicated by the symbol , only by components identical to the original ones. Any other component substitution (other than original type) may increase risk of fire or electrical shock hazard.
PLDC-P109B (32" sets) and PLDD-P109A (37" sets)
The output voltages to the chassis are:
* V STB (+3.3 V; stand-by mode)
* V SSB (+12.3 V; on-mode)
* V SND (+12.3 V; audio circuit).
Test instructions 32" & 37"
* check fuse (F101)
* standby check VSTB (C306), measure 3.3 V
* PFC voltage check (C644), measure 380 - 400 V; if no PFC applied, measure 311 @ 220 V
* multi-level check V SSB (C203), measure 12.3 V
* multi-level check V SND (C206), measure 12.3V
* reference voltage check (U401), measure 5.96 V (appr.).
PLDK-P107B (55" sets)
The output voltages to the chassis are:
* V STB (+3.3 V; stand-by mode)
* V SSB (+12.3 V; on-mode)
* V SND (+12.3 V; audio circuit).
Test instructions 55"
* check fuse (F101)
* standby check VSTB (C301), measure 3.3 V
* PFC voltage check (C646), measure 380 - 400 V; if no PFC applied, measure 311 @ 220 V
* multi-level check V SSB (C203), measure 12.3 V
* multi-level check V SND (C202), measure 12.3V
* reference voltage check (U401), measure 5.96 V (appr.).
A 272217190604 - 272217190605 PSL. Power Supply Unit with Integrated LED Driver Schematic
A 272217190609 PSU Circuit diagram
A 272217190611 PSU Circuit diagram
Posted By: FRANK at 02:55
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