Philips manual Repair Flow Chart Continued, V30 107T5, Go to cover page

74 V30 107T5

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Repair Flow Chart (Continued)

	rough check for R,G, B
B.Video	1. video input= 0.7V
Repair Flow	2.	7331video output =2.5V
	3.	7701 video output > 35Vpp

check blanking 7501 pin3

Ok

1.Sympton :
(with white pattern)	check heater

check

Ok

check

check

R,G,B output

No 30<2722<80

no picture	= + 6.3V
green LED on

2.Sympton :

EHT=25KV

No

check Xray prot. 7501 pin25

check blanking 7501 pin3

Ok

VG1 < -150V

check VG2 > 450V

30<2723<80

30<2724<80

Ok

check DC restoration 7722,7732,7752

7721,7731,7751

no video (or dim),

only raster with/without retrace line green LED on

check Vg1 Vg1 = -30V

		check cathod
No	turn down Vg2
		+83V,

	check 7331 pin22	Ok
	2V< ABL < 5V
	Ok
	check 7331
	Pin24 HFLB
	Ok
	replace 7331
3. Sympton :	H.V.check 7331
no OSD or
OSD out of sync.

check 7331 pin 7,6,5 input swing

No

replace IF

cable

check 7701 pin 1, 2, 4 input swing

Ok

replace 7701

check 7701 pin 9,10,11

output swing