LG ultra slim tv/copypaste...
model : 21LS2RD
Chassis : CW81A
ic 02 : 24C16/epprom
ic 04 : KIA78L05/vdd +5V micom
IC 301 : LA78141
ic 401 : KA393
ic 501 EAN60681601/LV76211 3C 5AL5
ic 601 : LA42012
ic 810 : STRW6553
IC 804 : KIA78R09/+9V
ic 805 : KIA7805/+5V
FBT : BSC25N0329
- pin 1 collector
- pin 2 B+180V
- pin 3 B+115V
- pin 4 GND
- pin 5 inner/N.C
- pin 6 B+26V
- pin 7 N.C
- pin 8 ABL
- pin 9 heater
- pin 10 AFC
the initial damage to the standby LED start only flashes for a moment and the sound of cit cit, keeps disappearing, disassembles chasing check:
- T403 C6090 not short
- D406 is not short
- FBT is not short
- D823,D824,D826 is not short
- ic 601 is not short
- checked again, found Elco C826 1000uf/16V capacity decreased/ESR also increased
- C834 2200uf/25V also bloated
replace C826, C834 tv start alhamdulillah clink
Additional data:
A. protection:
main protection pin pin 29/ABN/abnormal rated normal +4.96V
- sensor protect Q403 BF421/protect OCP/over current protection, current protection/overload on the PSU, the cause of protection can be from the PSU output drop, because T403 short circuit, D406 short circuit, FBT short circuit, IC 301 short circuit, Q405 K2961 short circuit, FR403 2.4 ohm 2 watts increase resistance
- Q301 vertical sync protection, will protect if ic 301 is shorted / not working normally, vertical yoke is broken, FR391 is broken
- disable protect remove solder collector transistor Q16 C5343
B. normal voltage data:
1. PSUs:
primary PSU ic 810:
- pin 1 +264VDC
- pin 2 gnd
- pin 3 +19.4VDC
- pin 4 +4.1VDC
- pin 5 +1.7VDC
- pin 6 0 V
IC 802 :
- pin 1 +11.43V
- pin 2 +10.39V
- pin 3 +7.07V
- pin 4 +19.4V
Secondary PSU:
- cathode D826 +115.2V
- cathode D823 +11.44V
- cathode D824 +20.4V
2. IC 301 LA78141 :
- pin 1: +2.26V
- pin 2: +29.1V
- pin 3: +2.82V
- pin 4 gnd
- pin 5: +15.27V
- pin 6: +29.4V
- pin 7 : +2.26V
3. ic 401 KA393 :
- pins 1-4 gnd
- pin 5 : +3.12V/in EW
- pin 6: + 3.04V/FBP
- pin 7 : +2.11V/out gate
- pin 8 : +29.1V/vcc in
Q405 K2961 FET EW :
- drain : +13.89VDC
4. Primary horizontal transformer driver when ON : +56.7V
5. IC 804 KIA78R09 :
- pin 1: +11.44
- pin 2: +8.91V
- pin 3 gnd
- pin 4: +4.67V
C. list of damage and insulation:
1. tv start, the image widens and narrows following the light and dim, the image check/replace:
- C415 333/630V
2. tv start TR T403 immediately short check / replace:
- C414 183/2000V
- D406 RS4HF
3. image widens right and left check/replace:
- D407 RU4AF
- Q405 K2961
4. curved image into check / replace:
- 401
5. EW cannot be adjusted, check/replace:
- C415 333/630V
- C412 364 250V
- C413 563/630V
- L401
- Q405 K2961
- ic 401 KA393
6. ic 301 broke when starting B + 115V normal check / replace:
- C415 333/630V
- C412 364 250V
- C413 563/630V
- C414 183/2000V/down capacity a little then all out FBT voltage will go up
7. TV starts not long after total check/replace:
- ic 810 STRW6553
- C826 1000uf/16V
NB: anyone want to add...
Tidak ada komentar:
Posting Komentar