Acer AL502 AL502 Monitor Service Guide
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- Acer AL502 | AL502 Monitor Service Guide - Page 1
A L502 Service G uid ervice 15-inch LC D M onitor - Acer AL502 | AL502 Monitor Service Guide - Page 2
ly . 2.4.1 A 5V power s u pply f or LCD modu le, CPU an d log ic i s g en era ted fro m th e p ower sou rce. 2.4.2 I308 : 3-t ermi n al reg u lat or A 3.3V power su pply f or for LCD Modu le ON/OFF con trol is performed for power ON/OFF an d also for th e p ower sav in g se qu en ce. 2.5 Driver : - Acer AL502 | AL502 Monitor Service Guide - Page 3
Rec. & Filter Power Transformer Output Rec. & Filter PWM Driver FB 3. On-screen circuit (Circuit diagrams Main PWB) I300 Emb deo in pu t circu it i s con v ert ed in to t h e dig ital data of v ideo sig n al th rou g h th e in corporated A/D con v erter. Bas ed on t h is con v ersion , th is - Acer AL502 | AL502 Monitor Service Guide - Page 4
is assu med wh e n th e h orizon tal / v erti cal sig n als are as spec ified below. nIf th ere is n o h orizon tal sy n c sig n al in pu t. nIf th ere is n o v ertic al sy n c sig n al in pu t. nIf th e h o rizon tal sy n c sig n al is ou tside th e measu rin g ran g e of I300. nIf th - Acer AL502 | AL502 Monitor Service Guide - Page 5
Table 1 A L502 Mode No Resolution H-freq Band Width (KHz) (MHz) Polarity HV 1. 247 VGA 720 x 350 70Hz 2. 102 SUN 1024 x 768 65Hz 14. 157 VESA 1024 x 768 70Hz 48.36 52.45 56.48 65 70.49 75 ---- 15. 141 VESA 1024 x 768 75Hz 60.02 78.75 ++ Attention : 1. Wh en resolu tion be y on d 1024 - Acer AL502 | AL502 Monitor Service Guide - Page 6
trol for v ariou s sig n a l ty pes. (3) Power-su pp ly sequ en c e (LCD pa n el). 9.5 I2C bu s con trol 9.5.1 Re lated ports of I303 Port Pin No. I/O Signal name -con trolle d fu n ction s Th e follo win g fu n ction al c on trols are effec ted by I2C. (1) Con t rol o f EEPROM I304 for p arame - Acer AL502 | AL502 Monitor Service Guide - Page 7
A L502 9.6 Power ON sequ en ce Wh en th e POWERswitch is pressed, th e POWER OFF sig n al is tu rn ed "H". Wh en th is "H"poten tial is detected, th e CPU beg in s to establish th e respectiv e power su pplies accordin g to - Acer AL502 | AL502 Monitor Service Guide - Page 8
A L502 9.7 Power OFF sequ en ce Wh en th e POWER switch is pressed wh ile th e power su pply is ON, th e POWER ON sig n al is tu rn ed "H". Wh en tsh own below.h is "H"poten tial is detected, th e CPU beg in s to tu rn off th e respectiv e power - Acer AL502 | AL502 Monitor Service Guide - Page 9
on -in v ertin g refere n ce (pin 10 of I102) is at 1.25V n omin al. 10.3.7 Protecti on : Open -lamp p rotection in t h e ig n ition period is prov ided th rou g h both OZ960 Enable OSC SST Dimming control Output driver Protection Ignition Regulation Full-bridge switching Transformer Detection - Acer AL502 | AL502 Monitor Service Guide - Page 10
video cable is connected normally. NG OK Proceed "No OSD display"section. Input the sync signal of computer, or change the cable. Proceed "Checking the resolution change IC movement" section. Trouble Sh ooting Page 1 - Acer AL502 | AL502 Monitor Service Guide - Page 11
the video cable. Check OSD menu is displayed on screen when you push the "PROCEED" key. OK NG Next Page Proceed "Abnormal screen" section. Page 2 Trouble Sh ooting - Acer AL502 | AL502 Monitor Service Guide - Page 12
between P301 and I308 Failure point I308 Failure Is a dot clock being outputted under the condition that a LCD module is connected to P303 pin 44? OK NG Check the H-sync pulse of negative polarity is output 2) Printed wire broke between I300 and P303 pin 40. Next Page Trouble Sh ooting Page 3 - Acer AL502 | AL502 Monitor Service Guide - Page 13
Check the data signal output on P306 and P303 R, G, B data pin. OK NG Failure point 1) The cable broke between P303 , P304 and LCD module. 2) LCD module failure. A L502 Failure point 1) I300 failure. 2) Printed wire broke between I300 and P303 pin 42. Failure point 1) I306 failure. 2) Printed - Acer AL502 | AL502 Monitor Service Guide - Page 14
a BRI signal NG OK Failure point 1) Printed wire broke between I303 pin 17 and I307 pin 3 2) I307 failure. Failure point 1) Inverter cable disconnection. 2) Inverter of LCD module failure. Trouble Sh ooting Page 5 - Acer AL502 | AL502 Monitor Service Guide - Page 15
42. 2) R355 open 3) C382 short Check the SHFCLK OUTPUT to P304 pin 44 from I300 pin 44 at TTL level. OK NG Process "Checking the resolution change IC movement" section. Failure point 1) Printed wire broke between I306 pin 44 and P307 pin 44. 2) FB314 open 3) FB315 open 4) C380 short 5) C381 - Acer AL502 | AL502 Monitor Service Guide - Page 16
5. NO OSD display Check the input of pulse from I300 pin 5, 6. NG OK Failure point 1) Printed wire broke between I306 pin 5 and I303 pin 9. 2) Printed wire broke between I306 pin 6 and I303 pin 8. Proceed "Checking the resolution change IC movement" section. A LC502 Trouble Sh ooting Page 7 - Acer AL502 | AL502 Monitor Service Guide - Page 17
isn't communicating in DDC2 mode. 2) The video cable may have failed or may not to have connections for DDC. 3) Between I305 pin 6 and P302 pin 15 may have failed. 4) R337 open. 5) Cable failure. A LC502 Page 8 Trouble Sh ooting - Acer AL502 | AL502 Monitor Service Guide - Page 18
and I301 pin 94 3) R346, R348 open 4) C372, C373 short Process "Checking the resolution change IC movement" section. A LC502 7.2 Checking the control circuit of vertical sync pulse , R343 open 4) C369 short Process "Checking the resolution change IC movement" section. Trouble Sh ooting Page 9 - Acer AL502 | AL502 Monitor Service Guide - Page 19
8. Checking the resolution change IC movement A LC502 Is there +3.3V supply on I300 pin 17, 21, 57, 77, 79, 97, 102, 117, 137, 154, 156, point 1) FB319 open 2) Power source Failure point Print wire broke between I302 pin 6 and I300 pin 2. Failure point I302 failure Page 10 Trouble Sh ooting - Acer AL502 | AL502 Monitor Service Guide - Page 20
power on (I) Check output voltage +5V, +15V is right or not. OK NG It is not power board problem. Check power switch is turn on or not. NG OK Turn switch on. Check power cord ( P801), around I802, I803 and the other components and repair them. Repair them. Trouble Sh ooting A LC502 Page 11 - Acer AL502 | AL502 Monitor Service Guide - Page 21
on in amber momentarily when a power button is pushed? NG OK Failure point Power source failure. Proceed "Checking the operation of CPU". A LC502 Page 12 Trouble Sh ooting - Acer AL502 | AL502 Monitor Service Guide - Page 22
between I308 pin 3 and output of FB322. Failure point I308 failure Failure point Printed wire broke between I308 pin 2 and I300 power supply pin. A LC502 Trouble Sh ooting Page 13 - Acer AL502 | AL502 Monitor Service Guide - Page 23
I303 pin 10. (14 msec Typ) NG OK Failure point 1) Printed wire broke between I310 pin 4 and I303 pin 10. I303 failure. A LC502 Page 14 Trouble Sh ooting - Acer AL502 | AL502 Monitor Service Guide - Page 24
open. Is output wavefrom being outputted in I001 pin 14, 17? NG OK Is 15V supplied to I001 pin 15, 16? NG Failure point 1) Speaker cable disconnectionOK 2) Speaker failure Proceed section 9.1 "No power on". Is ". Proceed section 11 "Checking the operation of CPU". Trouble Sh ooting Page 15 - Acer AL502 | AL502 Monitor Service Guide - Page 25
13. Checking inverter board circuit Check Vin pin is around 15.5V. On/off pin is over 2V. Brightness pin is between 0V and 3.7V. OK NG It is not inverter problem. Check pin 5 of I102 is 5V. NG OK CR102 and like those) work right and repair them. Repair them. A L502 Page 16 Trouble Sh ooting - Acer AL502 | AL502 Monitor Service Guide - Page 26
A L502 1. Recommended Parts List Note: 1. 2. 3. The components identified by " "mark are critical for X-ray safety. Replace these with only the same parts specified. The components identified by "* "mark are critical parts. There is only OTP IC at the model beginning (FPR stage or before). When