Tech Tips — September 2014

CE Professional Tech Tip Sharing

September 2014

**NOTICE**

Due the danger and complexity of electronics repair, the following shared
technical tips are intended for professional reference only. Please refer to
manufacturer’s recommendations as Encompass does not guarantee the accuracy,
reliability or safety of this information.

Hitachi TV, 50V500A

Reason for Service: No picture, no OSD, sound is normal and lamp is on.  Some random color dots can be seen.

Solution: 1.8V from power
supply on  connector PPS2 was
missing.  Replacing the power supply
fixed the set.

Hitachi TV, 
53SDX01B

Reason for Service: 
No audio from ext. input 2

Solution:  Do a hard reset and re-adjust horizontal position and sub
brite in service mode.

Mitsubishi DLP TV, WD-62327

Reason for Service: 
Dead, red light error 34

Solution:  Check for 5V at J-9 connector pin 1 and 2 on the engine
driver board.  If missing, replace the
power board #930B921001.

Philips TV, 
42PFL5432D/37

Reason for Service: 
Power supply still dead after replacing several bad
caps.  It chirps now.

Solution: Replace ZD904 and
902, part number P6KE120A.

RCA TV, MM101

Reason for Service: 
Audio from the left channel was buzzing

Solution: Found a shorted
cap between pins 4 and 6 of the output. 
C11912

Samsung TV LNS4041DX/XAA
Reason for Service: Won’t start, but cycles

Solution:  Check power supply for bad caps and bad solder on Q801,
Q802.

Samsung LNT4069FX/XAA

Reason for Service: 
Picture flashes off and on (backlight problem)

Solution: Replace ICM804 on
power/inverter board, BN44-00167C

Sanyo TV, DS31590

Reason For Service:  Dead, fuse blown
(lightning?)

Solution:  Replace the following parts: Q601,
Q604, Q605, D612 and the 4A fuse

Sony TV, KF42WE610

Reason for Service: 
Lamp enclosure gets too hot

Solution: The sirocco fan
above the housing was clogged; clean it out.

Toshiba TV, 37AV502U

Reason for Service: Dead

Solution:  Found two 150V zeners in the power supply bad.