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 !

Tuesday 19 March 2019

SAMSUNG 100 Hz TV - WS32Z308PAXXEEC - HOW TO TROUBLESHOOT

SAMSUNG 100 Hz TV - WS32Z308PAXXEEC - TROUBLESHOOTING BY BLOCKS - HOW TO TROUBLESHOOT


SYSTEM BLOCK
CXA2171Q (Component Switching) Diagnosis
Component 1 and 2 input operation (Y: 0.7Vp-p)
IC distinguishes between the SD/HD (31Khz, 33Khz) signal formats.
Market Defect cases: The screen is pushed to the right side or the picture is divided into two on the screen.
  • Power supply: 5V
  • Check for input defects: Y/Pb/Pr signal
  • Check for output defects: Y/Pb/Pr, H/V signal
Check for output defects : R/G/B 24BIT H/V/Clock
MST9883 Diagnosis
This receives the Component signal, which is equal to or higher than 480P, detects Sync and decodes the signal. If the signal color is out of order or noise appears in the Color Bar pattern, check the R/G/B Digital output cable.
  • Power supply : 3.3V
  • Check for input defects : 480P, 720P, 1080i Y/Pb/Pr signal.
DNIe (SPD41) Diagnosis
This removes noise from the signal processed by the EAGLE IC for better visual quality. It provides a clearer and near natural color picture. Defects in DNIe are rare.
  • Power supply : 1.8V, 3.3V
  • Check for input defects : R/G/B 24BIT H/V/Clock
  • Check for output defects : Y/Pb/Pr H/V
CXA2165 Diagnosis
This receives the Y/Pb/Pr input from DNIe and outputs to R/G/B. It also outputs V/H Drive and E/W, and controls the operation of ABL.EHT. If V-Drive output fails, check for an IC defect.
  • Power supply : 5V, 15V
  • Check for input defects : Y/Pb/Pr H/V
  • Check for output defects : R/G/B, ABL, EW, V/H-DRIVE
MSP4440 (Audio Processor) Diagnosis
This receives the SiF signal from the Tuner, and the external input signal 1/2/3/4, and performs signal processing for the signals.   It can input and output the I2S signal for the Audio Delay.
  • Power supply : 5V, 8V
  • Check for input defects : SiF, Scart 1/2/3/4
  • Check for output defects : Lt/Rt, Monitor Out
TDA7297 (Audio Processor) Diagnosis
This receives the signal from the Audio Processor (MSP4440) and outputs the signal in 10W + 10W sound.
  • Power supply : 16V
  • Check for input defects : Lt/Rt
  • Check for output defects : L+, L-, R+,R-
Countermeasures by Deflection Types
  • The screen is blank and only the relay repeats close and open when turning the power on.
  • This happens when the vertical voltage or vertical signal is not supplied, and because the Micom operates for 5 to 10 seconds and then turns the power off by force as it cannot detect the vertical signal.
CHECK POINT
Check that the vertical output voltage is measured in the FBT terminal.
=>VCC (+) : 19.5V ~ 20V. VCC (-) : Higher than 16.5V
If you cannot measure the output voltage, check that the collector voltage of the horizontal TR is 1360V. If the voltage is measured, the problem is a defect in the FBT unit. (When you don't have an oscilloscope, and you can hear the high-voltage sound, you can determine that the horizontal TR is normal.)

Is the vertical input waveform output from the CXA2165 Chroma IC?
Input waveform: Approximately
If the signal is not measured, check the CXA2165 VCC power voltage > 9V
Check that 15V is the proper output from the SMPS TRANS?
Countermeasures against problems
  • The drooping of the top and bottom of the screen is too severe. This may happen when the N/S correction circuit is out of order.

CHECK POINT
=> Measure the terminal V2 of the Vertical DY and check that the N/S correction signal is properly supplied.
=> 70Vpp.
If the correction signal is not measured, check that the Lead of L304 (N/S TRANS) is disconnected. If L304 is normal, check the soldering status of C305 and C439.
Posted By: FRANK at 04:51
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