TELEVISON REPAIRED:

MEQUE: With one horizontal white line:

My sister in law's mother sent me her 14 inches MEQUE television and the complaint was one horizontal white line. To confirm this, i plug the set and turned it on and I see it.

I unplug the set and open it by removing 7 screws. I flipped the the TV so that the PCB board is facing me.
Since it has one horizontal line, I already assumed that the power supply is working fine. So I go directly to the vertical section. This TV is using LA78040B vertical IC. According to the datasheet, pin 2 is the VCC supply. I traced back the supply and I see that it get its supply from the secondary circuit not from the flyback. So I took my DMM meter and measured the voltage of the VCC supply and I got 24 volts DC and shows that the supply is OK. By the way, I clipped my black probe with a crocodile clip to the CRT ground and the red probe to the VCC supply. I scanned around the vertical circuit and everything looks fine. So I directly replaced the vertical IC and after that I plugged it to the oultlet and turned it on.

I've said a big YESSS! When the set gets back to normal operation...

Thanks for reading... see next post.

TELEVISION MAJOR PARTS USED: For reference and troubleshooting.

MEQUE:

BSC25-T1010A - Flyback Transformer
24C08A - EEPROM
TDA2003 - Audio IC
LA78040B - Vertical IC
C5287 - Regulator
DD5024 - Horizontal Output Transistor
Toshiba- Hay-29 8873CSCNG6V11 - Jungle IC

VGL:
MODEL NUMBER: 14/17/19

BSC25-T1010A - Flyback Transformer
24C08A - EEPROM
UTC78040B -  Vertical IC
D1555 - Horizontal Output Transistor
D5038 - Regulator
LA76931K - Jungle IC

SHARP:
MODEL NUMBER: 21V-FW80M

JF0501-32601 - Flyback Transformer same with SHARP MODEL NUMBER 21V-FR75M
LA78040B - Vertical IC
STRW-5453A -  Regulator
TT2140 - Horizontal Output Transistor
AN17821A - Audio IC

PANASONIC:
MODEL NUMBER: TC-21SF3

KFT3AB096F - Flyback Transformer
C5241 - Regulator
 D2499 - Horizontal Output Transistor
MN1873265TB2 - Jungle IC
LA7837 -  Vertical IC
ATMEL028 - EEPROM