U4 : EEPROM(24C64) change
3. When “Tuner connect Fail” Message happens
If POWER supplied to Tuner is normalcy, Tuner must change.
4. When “ FLUSH DRAM ” Message happens
U7(L64005) and U8(KM416S1020) Re-soldering do, and
change U7(L64005) if is happened again.
5. Normal Message as being displayed, change MICOM if TV screen
does not come
5.2.2. When “NO SIGNAL” message appears
(1) U19:(KA317(Regulator))-> pin 3 : 21V~24V
U19:(KA317(Regulator))-> pin 2 : 13V /18V
If confirm that voltage is measured and is not measured, U19 change
Action) : When U19's(KA317) input voltage is low, do you change SMPS,
do U19 Voltage Line check in SMPS if change SMPS and is
low.
(2) Measure by Voltage Meter(Oscilloscope) whether VERTICAL(13Volt) or
HORIZONTAL(18Volt), 22KHz(ON/OFF) is displayed normally measuring
voltage of F100's Lead(or Tuner LNB OUT PORT) when do SCAN
satellite in INSTALL MENU.
(LNB supply voltage check)
(3) When LNB voltage(13V/18V) is not displayed, it changes Q27(TR:kta1273) if
13V/18V is displayed measuring Q27's(TR:kta1273) Emitter monad by
Voltage Meter and measure whether 13V/18V is displayed in F100(Poly
Switch)
Action) : If mania is happened to F100 or Q27 after shift Tuner shift
(4) Voltage measurement supplied to TUNER
1. L13(Coil) : about 5V,
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